Zipper Mowers Max 309 360 Users Manual

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2015-02-03

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Part # 309-360 for Big Twin Models
Touring Models
- Speedometer Calibration Settings
  - IMPORTANT STEP BEFORE STARTING

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 1

Part # 309-360 for Big Twin Models

Thank you for purchasing a ThunderMax ECM!

Please read through the following instructions before

beginning the installation procedure. Following these

instructions will ensure that the ECM is installed and

setup properly for optimal results. If you have any

problems or questions, please refer to the SmartLink

Tuning .pdf Manual, included on the CD (Help Menu)

with this package.

Step 1 Inse the SmartLink

CD into your computer.

SmartLink will automatically

open the InstallShield

Wizard when the computer

finds the CD-Rom. Follow

the instructions and install

the software on your

computer. If you do not have a serial port on your

computer for the communication cable, you will need to

use a USB to Serial converter (an inexpensive converter

is available from Zipper’s, #372-000). Install the included

driver disc at this time; follow the instructions given by

the manufacturer of the converter for installation.

Install the Th

underMax and AutoTune (if

Step 2

equipped) modules. Special Note: Module location on

some model motorcycles (notably all Dyna® and

Softail® Rocker® models) makes it difficult to insert the

communication cable once the module is installed. An

8” ‘pigtail’ harness is available (# 309-324) that can be

permanently connected to the bike’s ECM harness plug,

allowing a remote port for the communication cable if

desired. Compatible with ThunderMax ECM serial

number 114000 or higher (starting August 2008).

- Locate the fuse box that contains the EAll Models

fuse, remove fuse labeled “ECM POWER”.

Touring Models

FL-A. Unplug the ECM wiring harness from the factor

CM.

L-B: Remove the factory ECM from the motorcycle

e ECM is held to the electrical caddy by socket he

p screws. The screws have a locking agent on th

a em

nd can be difficult to remove. Work the screws back

and forth slowly

a to break them loose.

FL-C: Install the ECM wiring harness to the

ThunderMax ECM. Do not install the ECM onto the

motorcycle at this point. If the ECM is mounted onto the

electrical caddy at this step, it is difficult to get the fuse

box in place.

FL-D: Route the AutoTune harnesses (if equipped)

through the frame opening before positioning the ECM

Tune harness into the 4-pin gray data

for installation. Re-install the ECM fuse and secure th

fuse box back into position on the electrical caddy.

FL-E: Mount the ThunderMax ECM onto the electrical

caddy using the two factory socket head cap screws.

Plug the Auto

port (shown).

Installation / Setup Guide

Please Note: This product is Legal in California

only for racing vehicles which may never be used

upon a highway. The user shall determine suitability of the

product for his or her use. Installation and use on a pollution-

controlled vehicle constitutes tampering under the U.S. EPA

guidelines and can lead to substantial fines. Review your

application and check your local laws before installing.

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 2

Softail® Models

ST-A: Remove the seat, locate and remove the ECM

fuse. Remove the stock ECM from the motorcycle and

the wiring harness plug from the ECM. Lift the battery

up from the oil tank and remove the battery cables

(negative first). Remove the battery.

ST-B: Remove the bolts holding the fuse block bracket

to the frame and lift the bracket away from the frame to

allow access to the gap between the frame and oil tank

on the right side of the motorcycle.

ST-C: Connect the ThunderMax ECM to the harness

and position it loosely in the ECM tray. Feed both

oxygen sensor harnesses (front cylinder first) through

the gap between the frame and oil tank on the right side

of the motorcycle.

ST-D: At this time you may want to snake the rear

oxygen sensor towards the rear exhaust pipe by starting

it from the right side of the bike, under the oil tank, and

around the seat post to the rear exhaust position (do not

connect it to the harness until after it has been installed

and tightened into the exhaust pipe, so the harness can

turn freely). Ensure that the rear O2 harness plug is

positioned closer to the swingarm pivot bolt so it will not

be crushed between the upper swingarm and the oil tank

at full stroke (suspension bottomed).

ST-E: Position the harness plug for the front pipe under

the transmission, along the frame rail. Install the oxygen

sensors into the exhaust pipes, connect the harness

plugs to the oxygen sensors and secure the harnesses

west point) to the frame (above the lo

with wire ties.

ST-F: Re-install the fuse block

bracket bolts and attach the

ThunderMax ECM to the ECM tray.

Re-install the battery (positive cable

first) and install the ECM fuse.

Plug the AutoTune module into

e 4-pin gray data port plug on th

the motorcycle.

FXD (Dyna®) Models

FXD-A: Remove the left side cover to reveal the

electrical caddy. Remove the main fuse (1). Use a

small screwdriver to release the catche

block, relay block and TSSM module to the electrica

caddy (2). Unplug the main harness fr

remove the data plug from its holder (3

hex head and 1 socket head mountin

caddy for removal (4). Unplug th

harness from the coil and remove the c

s holding the fuse

om the ECM and

). Remove the 2

g bolts to free the

e plug wires and

addy.

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 3

FXD-B: Remove the

stock ECM from the

electrical caddy. The

caddy must be slightly

modified for additional

main harness

connector clearance.

Use a Dremel or Roto-Zip tool to provide additional

clearance for the harness plug catch; also remove

approximately 3/8” from the partition support as shown.

FXD-C: Because of the impossibility of connecting the

communication cable without disassembly once

assembled on FXD models, the cable should be

permanently installed to the ThunderMax, or the optional

entioned in step 2 used. If using the

‘pigtail’ harness m

communication cable, and

feed it and the AutoTune

ECM plug port of the cadd

caddy as shown. The ox

exit towards the opposite side of the cad

if equipped with AutoTune,

power harness through the

y and mount the ECM to the

ygen sensor harnesses should

dy.

FXD-D: If equipped with AutoTune, before reinstalling

the caddy, feed the front cylinder oxygen sensor harness

through to the right side of the bike, over the top and to

the rear of the starter motor. Reinstall the caddy with

fuse and relay blocks in place. Reconnect the TSSM,

coil and ECM harnesses and main fuse. If equipped

ith AutoTune, plug the closed loop module into the

4-pin gray data link on the bike. It is through the data

port that data from the AutoTune module is transferred

to the ThunderMax. A ‘Y’ harness is available (# 309-

343) to keep an open data port if desired. After

programming and setup, the communication cable can

be coiled up and kept under the caddy cover if not using

the ‘pigtail’ harness.

Oxygen Sensor Installation (AutoTune)

If equipped with AutoTune, install supplied wide band

oxygen sensors in the front and rear exhaust pipes.

FXD and all 2007-up models are equipped with

narrow band sensors, which must be removed and

replaced with the supplie d units. The wide

band sensors are long factory sensors.

Installation of the wide ors into factory

headpipes presents no lems, however,

some aftermarket pipes may require exhaust pipe

mo bung relocation for interference-

free sors must mount freely without

contacting surrounding components. If this is not

2006

d wide ban

er than the

band sens

clearance prob

dification or sensor

installation. The sen

possible, do not attempt to bend or modify the

sensor in any way as it is a sensitive electronic

component and will be damaged if you do. Modify

the pipe if required for clearance. Weld-in bungs are

available for exhausts systems not equipped with bungs

or if current bungs present clearance issues. Bungs

should be located no more than 3-4” from the head/pipe

connection (for ideal location, refer to the factory location

on 2007-up models). Weld-in bungs are available from

Zipper’s (#272-200, straight; #272-202, angled). After

installation, route the sensor harness away from the

engine and along the frame when possible, above the

lowest frame point to avoid the possibility of dragging

ground during operation. Avoid routing harnesses where

engine movement or moving parts can contact and

damage the harnesses or connector plugs.

Connect the sensors to the closed loop module. The

AutoTune harness for the rear cylinder sensor is shorter

and can be easily identified by black tracers on all of its

wires; both plugs are clearly marked for front and rear

use. It is very important to install these correctly or the

engine will perform poorly! Tie the harnesses to the

frame or existing component harnesses, taking care to

avoid contact with any vibrating component that may

chaff the sheathing or wires. Some disassembly of bike

components may be required for best harness routing.

FXD Tips: The rear harness mounts easily, just coil

the excess wires and locate them above the

transmission. The front harness should travel from the

AutoTune module, over and to the rear of the starter

motor, behind the exhaust support bracket and between

the crossover pipe and the transmission.

Remove the footpeg/brake pedal bracket mounting bolts

and move the assembly towards the exhaust pipe.

Route the front exhaust sensor harness under the cam

cover exhaust support bracket and behind the brake

pedal; connect it to AutoTune harness.

The sensor plug and harness will drop down to the frame

rail with a little brake pedal wiggling where it can be zip-

tied to the frame rail, out of sight and out of harm’s way.

Dyna

: ECM installed with

communication cable attached.

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 4

Step 3 Load a Base Map to your SmartLink software.

Selecting a base map for your ThunderMax is easy

thanks to the filtering system in the SmartLink software.

Open SmartLink; from the toolbar choose [EFI Maps]

[EFI Map Listings / Definitions]. You should first

update the Map Definitions file to ensure you have the

latest available maps. Close the [Base Map

Definitions] window, then click the [Check Internet For

Updates] button (requires internet connection; follow

prompts). After updating, select [Select BaseMap].].

Available base maps will be shown (if the [Clear Filters]

lower left of the screen is highlighted, click

it to clear filtered maps so all maps will be shown).

button at the

Filter the maps to locate a base map that best matches

your application by placing your curser first over any

‘Engine Type’ that matches your engine and right-click it.

All maps that do not match your selection will be filtered

from the screen.

Second, place your curser over the ‘Throttle’ column

and right click your match.

Third, right-click the ‘Exhaust’ type that closest matches

your application.

Fourth, right click the ‘Muffler’ column if further definition

of the exhaust system is required (depends on exhaust

application). Keep right-clicking the application columns

until you have located the best map match (in the case

of identical maps, choose the latest date). Highlight the

map you’ve chosen (left-click; blue bar indicates

selected map) and click [Close] button. This brings you

to the ‘Base Map Name Encoding’ page, from which you

can review the map parameters. Click the [Load

BaseMap] button to load the map into the software.

From this page you can load the base map into the

tware by clicking the [Load Base Map] button.

[Close] this page to view the open map page. From the

‘Tuning Maps’ Tree, click the + sign next to [Module

sof

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 5

Configuration], then double-click ‘Basic Settings’.

The basic pa settings ge opens. Check to see if the

[Speedo Cal] calibra tches ear and

model; if not, click th c alue as

shown, then click [Close].

Speedometer Calibration Settings

Step 4 Next is to configure the module for open or

closed loop operation (closed loop operation requires the

AutoTune module and wide band se aps

will initially open as ‘Closed Loop Configured’ by defau

lling the ‘Module’ settings

while the s. The

ap’ side is used to store the settings you desire the

ase map to dictate to the module. The ‘Module’ side,

ditable only when linked to the module, can be used

ter to override the map settings if desired.

tion setting ma

e button, enter the your y

orrect v

nsors). Most m lt.

To change or edit these settings, select [Configure]

[Closed Loop MODULE Settings] from the toolbar to

open the dialog page. This page is divided into two

e left side controhalves, th

right side controls the ‘Map’ setting

‘M

or closed loop (AutoTune) operation, click the ‘Closed

oop Processing’ box. For open loop operation, this box

hould not be not be checked (click checkmark to un-

heck). Close the window. Once linked, the system

etects if an AutoTune module exists on the bike and will

form you via screen message if there is a mismatch.

tep 5 Now you are ready to ‘Link’

nd ‘Write’ the map to the ECM.

ttach the communication cable

xhaust

Step 6 To link to the module, turn the key switch to the

“Ignition” position, making OFF”

rocker switch (Kill Switch) s is in

the “RUN” position. Select

martLink software. The button turns green to indicate

from your computer to the

ThunderMax module, making

certain that the cable is routed away

from any part of the motorcycle that

generates heat.

Special Note for International Model Bikes with

Active Exhaust Enabled: If your bike is equipped with

a working Active Exhaust Valve, you must unplug the

active exhaust harness before linking to the module, as

the AEV circuitry conflicts with the communication

stream. You can re-connect the harness after unlinking.

If the stock exhaust has been changed, disregard this

tep. ThunderMax does not support active es

certain the “RUN /

on the handlebar control

the “Link” Button in the

S a

successful link. Answer [No] to the “Do you wish to

READ the module map now” question at this time.

odule Maps and

that informs you

ent map in the

he map load.

ore performing this

From the toolbar, click [File] [Write M

Settings], answer OK to the message

that you are about to overwrite the curr

module; the transfer bar appears during t

Step 7 Verify Module Settings. Bef

step, clear any a

ctive Diagnostic Code readings. While

linked, from the Tuning Tree select [Module

Configuration] [Diagnostic Codes].

2004-2005 FXD 40960

2006-2007 FXD 45900

2007-up CVO 42450

Dyna®

2008-up FXD 42450

2001-2003 4352

2004-2006 40960

Softail

2007-up 42450

2002 4352

2003 20480

2004-2006 40960

Touring

2007-up (16”)

2007-up (17”) 42450

42000

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 6

When the Diagnostic Codes window appears, select

[Clear Diagnostic Codes]. After completing this step,

select Basic Settings from the Module Configuration

click

ed Loop Configuration]. Verify that the [Closed

Loop Processing] and [AutoTune] boxes are checked

√ on the left (module) side of the window.

menu and verify that the speedometer calibration is

correct and if the bike is a 2007 or later model the 6th

gear indicator settings are correctly set (Final drive ratio

[87] for Touring & Softail®, [84] for Dyna® models) Gear

6 Min TPS [40]). After verifying these settings, click

[Write Basic Settings]. If the installation is to be

operated in closed loop mode (with AutoTune module),

select [Configuration] from the toolbar menu and

[Clos

IMPORTANT STEP BEFORE STARTING

Next, ‘Initialize’ the ThunderMax ECM. Initializing

synchronizes ‘home’ positions for the TPS and IAC, and

is a required step any time battery power has been

interrupted or established to the ThunderMax ECM.

With the handlebar switch in the ‘ON’ position, cycle

the key switch on and off 3 times, leaving the

ignition on for 30 seconds, then off for 30 seconds,

each cycle. DO NOT start the engine or move the

throttle during this process. After 3 on/off cycles, make

certain that the motorcycle is in neutral and start the bike

2 times, letting it settle at idle for 10 seconds; the idle

should be smooth and steady. Some engines may

require several on/off engine starts to initialize properly.

This initialization process must be performed any

time battery power is interrupted to the module (after

battery servicing/winterization, etc). After initialization,

shut off the engine, but stay linked for step 8.

Step 8 Before re olbar click

nitoring] [Show Gauges]. The “Engine Spe

e , AFR

starting the engine, from to

[Mo ed”,

“Engin Head Temp”, “IAC Position”, “AFR Front”

Rear” and “AFR Target” gauges are automatically

formatted and are shown on the screen. Additional

gauges can be created if desired (see SmartLink Tuning

Manual under Help menu), but the above gauges are

most helpful during initial set up. You may select any

gauges that you deem important; if too many are chosen

your screen may appear cluttered.

Step 9 Select the “Monitor” button to active the gauges.

It is located beside the “Link” button and will turn green

when the monitor gauge functions are live. The gauges

will be displayed if they were not already on the screen.

Step 10 Now select the IAC Stops vs. Engine

Temperature ” menu within the

tuning e the

page from “IAC Curves

tree. Strik

spacebar to show the actual values of the tuning block

(use left/right arrow keys to move the block marker).

Make certain that the motorcycle is in neutral and the

engine is cold, and then start the engine. Once the

engine idle is stable after 15- 20 seconds, select the

“IAC-Auto” button (Idle Air Control Auto Adjustment).

Allow the “IAC-Auto” function to run at idle until the

engine head temperature reaches 275 degrees. After

reaching temperature of 275 degrees, the “IAC-Auto”

function automatically shuts off. You can terminate this

communication cable from the Thunde

the ‘Save As’ command to create a folder and save the

map to your hard drive. The motorcycle is now ready to

be ridden. Several riding sessions that allow the engine

to reach normal operating temperature should be

completed. During this process, the IAC virtual stops will

sted to the IAC target values se

he IAC stop

engine will dip below the specified idle speed during

certai s are above

ove the idle rpm

spec mperature page.

function at any time, and re-run it at a later time if you

wish.

Step 11 Unlink the SmartLink software from the ECM,

turn off the ignition switch and remove the

rMax ECM. Use

automatically be adju t

within the map’s basic settings. This feature

automatically adjusts how the engine comes back to the

specified idle speed. If t s are set too low, the

n transient conditions. If the IAC stop

the IAC position, the engine will idle ab

ified in the idle speed vs. engine te

If it determined that these automatic adjustments ha

not resulted in satisfactory operation of the engine,

consult the SmartLink Manual (available under the Help

section of the toolbar), Section 3 (Tuning the

ThunderMax ECM) for further adjustment procedures.

www.Thunder-Max.com 309-360 Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 7

CLOSED LOOP PROCESSING

When equipped with AutoTune, your SmartLink software

will allow you to set Air/Fuel tuning parameters for your

ThunderMax and its installed base map. To set the

AutoTune Limits, go to the toolbar and click [Configure]

MODULE Settings].

h e

all r

[Close Loop

The Closed Loop Configuration dialog page opens; the

right side shows the default MAP settings stored in the

MAP file (settings are applied to the installed base map

during the ‘Closed Loop Format’ conversion performed

by SmartLink), while the left side shows what the module

is currently set to (unadjusted, these settings will mirror

P’s settings). MA

T e un-highlighted left ‘MODULE’ side of the pag

ows editing of those settings within the MODULE fo

tuning purposes, while unaffecting the MAP settings. To

edit module settings, click the [Link/Read (Module)]

button (left side highlights/active). You can now edit

these settings within the live module should you want to

change any of the settings from the MAP default

settings.

Closed Loop Processing (Module) – Check [ON] to

nable closed loop AutoTune processing. During closed

op processing, the ThunderMax module processes

edback from the oxygen sensors to adjust the fuel

olume at all points by creating learned “offset” points

om the installed ‘base map’ fuel points. The ‘static’

ase map is dynamically used by the ThunderMax

odule and the AutoTune’s active (closed loop)

edback system. This system optimizes the fuel points

fit the target air/fuel ratio through ‘learned offset

oints’. These ‘learned offset points’ are stored within

e ThunderMax and are used in conjunction with the

ase map. The ‘base map’ fuel points are not being

s occurred, to the original base map

adjusted by either the AutoTune or ThunderMax

modules.

If AutoTune Closed Loop Processing is un-checked, fuel

points will be adjusted to the last learned offset points, or

if no learning ha

points. Stored offset points remain within the module; in

the event that power is interrupted for any reason, the

learned offset points remain until re-learned or cleared

under the [Map Editing] toolbar menu.

Air Fuel Ratio Override (Module) – A single Target

AFR setting can be applied using this command.

Clicking this box and changing this number overrides

ALL ‘Air/Fuel Ratio vs. TPS’ pages at all RPM’s. To

target specific Air/Fuel Ratio RPM ranges and throttle

positions, leave this box unchecked and edit the

individual ‘Air/Fuel-TPS @ RPM’ map pages located

under the [Tuning Maps] tree. Individual Air/Fuel

targets are pre-set within the base map to provide a

good balance between power and economy. Individual

cell throttle position/rpm AFR targets can be viewed and

adjusted on these pages. Use the left/right arrow keys

to navigate the individual blocks (strike the spacebar to

view the values); use the up/down arrow keys to adjust

the values. Click the [Monitor] button when linked live

and a vertical bar will show the actual throttle position.

See the SmartLink manual for further tuning instructions.

ldle Air Control Override (Module) - Check [OFF].

This setting should not be checked on except for

iagnosing a particular type of supported problem or

uring tuning on a load cell dyno. Changing this setting

will lead to starting and idling problems.

Maximum CLP Offset (Module) – [Session (Module)]

button sets the AFR maximum learning correction from

the base map’s fuel setting per session by percentage

(range is 0-10%). A ‘session’ is defined as the period of

time from engine on to engine off (per cycle).

[Maximum (Module)] button sets the total AFR

maximum learning correction from the base map’s fuel

setting by percentage (regardless of number of sessions;

range is 10-25%). Unless your application is a

considerable mismatch to the installed base map, the

default settings of 5 and 20 percent are sufficient for

most AFR corrections.

You should always pick the best possible map match

during the selection of your base map. The theory

behind this is to reduce the range and time the closed

loop system needs to learn offsets (corrections) for the

target AFR. If your map selection is a poor match to the

application, the amount of learning needed will be

significant. Review the parameters of your base map vs.

available base maps under ‘Base Maps Listing’ to

ensure you have the best map match and the latest

version of the map.

www.Thunder-Max.com Installation / Setup Guide V2009.04.23 ProductSupport@ZippersPerformance.com 8

TIPS AND GENER

•

INFORMATION

Several support features are located under the

[Help] menu; some require an internet

connection.

• A comprehensive Tuning Manual in PDF

format is included on the CD for viewing and

printing from your desktop.

• When the SmartLink program is opened, it

will automatically retrieve and open the last map

that was open.

• Any time you link to your motorcycle: Read

the map that is installed in the ThunderMax

ECM by selecting [File] then [Read Module

the SmartLink toolbar. Maps and Settings] on

HT models:

This will synchronize the map file loaded into the

ThunderMax ECM with the SmartLink software.

• 2003 FLT/FL H-D® used 2 different

f your factory ECM.

speedometer calibrations during the extended

2003 model production. Which calibration you

may need is easily identified by checking the

part number on the back o

Calibration 20480 is used if the part number

ends in -03, while 4352 is used if the ECM p/n

ends in -02. If your turn signals don’t cancel on

a 2003 model, try the alternate setting.

• 2007-up Big Twin models: There are two

settings in the [Module Configuration] [Basic

Settings] page that should to be set to the

following to enable the 6th gear indicator light to

function:

Final drive ratio [87; 84 for 06-07 Dyna®]

Gear 6 Min TPS [40].

• Sportster® models: The [Main Relay Loc]

must be set to “1” under the [Basic Settings]

[Module Configuration] page, or the engine will

not start.

• Accel Fuel is be used to tune throttle response

(go to [Module Configuration] [Basic Settings]).

• AFR Correction vs. Engine Temperature page

is used to adjust cold start AFR’s. It is active yet

should be used with extreme caution. Any

changes made to this page affects all maps, at

every throttle position, every 256 RPM’s! See

SmartLink Tuning Manual for procedures.

•

AFR vs. Engine Temperature is active yet at

this time you should be discouraged from

making any changes to this page.

• Air/Fuel-TPS @ RPM These pages reflect

desired targets of AFR to throttle position at

every 256 RPM. Example: if you desire a leaner

mixture for added fuel economy then you can

easily make multi-tiered AFR targets at specific

throttle positions and RPM’s that will be learned

during closed loop processing.

• During warm-up, the AFR on both cylinders will

be richer than the target AFR at normal

operating temperatures; this is a normal part of

the warm-up map. AutoTune and its targets are

inactive below 200 degrees.

ratios• Target air/fuel can be viewed on the

RPM pages. When these

pping the space bar to

rget at a specific throttle position for

Writing new or modified maps

Air/Fuel-TPS @

pages are open, you can view the target AFR by

clicking on a dot and ta

view the ta

that RPM. Use arrow keys to raise/lower targets.

• to the module

requires the system to be re-initialized (Step 7),

and any existing learned fuel and IAC

adjustments to be cleared (Map Editing, clear).

Linking and editing an existing map within the

module does not require above steps.

• System Updates are available through

pdates.

In-Tank Fuel Filters

SmartLink with an internet connection.

Software, Firmware and Map updates can be

downloaded; check frequently for u

• should be inspected as a

part of routine maintenance. The filter is small

and one bad load of fuel can clog it. The factory

recommended service interval is 25K miles.

• Save your edited maps to your hard drive

using the [Save As] command. Document the

changes in [Map Notes] located under [EFI

Maps on the toolbar. These notes are stored

with the saved map; remember to edit them

when making changes for future reference.

• Oxygen Sensor Care: Items that can damage

or shorten the life of your sensors:

Leaded fuel – Race fuel

Oil deposits from oil consumption problems

Excessive moisture exposure

Excessive (extreme) heat

There is no warranty on sensors. Replacement

P/N is 309-355.

Zipper Mowers Max 309 360 Users Manual

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