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Old 04-16-2009, 10:07 PM   #1 (permalink)
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Default ATV Troubleshooting Guide

Engine turns over but does not start

No Fuel

Dirt in fuel line or fuel filter

Fuel will not pass through on-off valve (petcock)

Fuel tank vent plugged

Carburetor starter circuit

Engine flooded

Low compression

No spark





Add fuel as required

Clean or replace valve as necessary

Repair vent system

Clean or replace as needed

Turn off fuel and drain crankcase
A) Inspect carburator venting system for blockage
B) Inspect carburator needle and seat
C) Inpect head gasket
D) Inspect piston and cylinder, repair as required

Check for proper spark plug connection


Engine does not turn over



Dead Battery

Starter motor does not turn

Engine stuck or froze


Change or replace battery

Repair or replace starter motor

Repair engine as required


Engine runs but will not idle


Plugged carburetor pilot system

Carburetor improperly adjusted

Low compression

Crankcase leak






Clean or replace pilot jet<

Adjust carburetor per specifications

Adjust choke per specifications

Repair engine as required

Repair or replace crankcase as required



Engine runs but will not rev up


Broken throttle cable

Obstructed air intake

Incorrect carburetor jetting

Incorrect ignition timing

Restricted exhaust system





Replace throttle cable

Clean or repair air intake, replace air filter

Jet as per jetting chart for carburetor

Check and adjust ignition timing

Repair, clean or replace exhaust system


Engine has low power


Cylinder, piston and ring wear or damaged

PVT not working properly

Restricted or blocked exhaust


Perform compression check

Clean, repair or replace as needed

Repair, clean or replace exhaust system


Piston scoring


Lack of lubrication

Fill oil tank and bleed oil pump

Check oil pump for proper operation or restricted vent line

Restricted oil delivery

Oil pump drive gear failure

Melted Piston top


Engine overheating

Lean air fuel ration

Air leak in crankcase

Incorrect ignition timing

Incorrect spark plug





Low coolent level in radiator (liquid cooled)

Restricted cooling fins (air cooled)

Clean carburetor and jets

Repair as needed

Adjust timing per specification

Install correct spark plug


Broken piston skirt


Piston fatigue from scoring

Excessive piston to cylinder clearance


Repair or replace cylinder and piston



Excessive smoke and carbon build up


Oil pump not adjusted properly

Oil pump cable not allowing pump to return to idle position

Synchronize pump to carburetor

Lubricate or replace cable

Engine coolent found in counter balance assembly


Water pump gasket

Water pump seals


Replace water pump gasket

Replace water pump seals


Blown engine


Skirt broken off piston, hole in crankcase

Bearings on counter balance shaft failed

Engine stuck or froze


Both result in engine not running, full compression. No crankcase pressure, which is needed for 2 stroke engine

Replace crankcase and other related parts
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Old 04-22-2009, 07:52 PM   #2 (permalink)
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A thing everybody should look at
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Old 08-11-2009, 09:34 PM   #3 (permalink)
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Ya my 94 warrior with an 02 motor we just put in smokes white buts its not burning oil and the spark plug electrode is still white but the very bottom ring is black n dry?? I need some help on this one lol
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Old 01-28-2011, 02:12 PM   #4 (permalink)
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Could you plz help me with a problem? i have a 07 ltr 450, fuel injected and it has a high idol. could you help with wat tht could be. Email me at cjsonyo@aim.com
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Old 02-07-2012, 03:19 PM   #5 (permalink)
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Default debt consolidation programs

Replace throttle cable

Clean or repair air intake, replace air filter

Jet as per jetting chart for carburetor

Check and adjust ignition timing

Repair, clean or replace exhaust system

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debt consolidation programs
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Old 05-18-2012, 08:59 AM   #6 (permalink)
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Default Hi,

Hi,

Contact any ATV mechanic.
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Old 06-03-2012, 12:14 AM   #7 (permalink)
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you can find a shop oem manual here fairly cheap, and you can download it right after payment

REPAIR MANUAL DOWNLOAD

... Peace
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Old 10-25-2012, 01:54 PM   #8 (permalink)
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I have a 1999 yamaha 400 kodiak that won't fire. Replaced spark plug first and checked igntion wire and cap all that's good. Any ideas
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Old 09-27-2013, 11:41 PM   #9 (permalink)
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Ho there. I'm having trouble with a dune buggy I just bought, with a 150cc Honda GY6 clone engine. It pretty much falls under the category of "starts, but won't rev up". It turns over and starts pretty easily, but if you hit the accelerator, the engine instantly dies. If I let it run for a few minutes then I can sort of slowly ease onto the accelerator until it revs up a little, but not fast enough for it to actually go anywhere.
Its brand new and only ran trouble free for about six minutes after I got it, so I doubt there's anything worn out. I've worked on tons of lawn mowers and cars before, but these CV carburetors are kind of a mystery to me. If you could let me know what you guys think is most likely I'd appreciate it.
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Old 09-28-2013, 01:05 AM   #10 (permalink)
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I started playing around with the air/fuel screw on it and got it idling faster by backing it most of the way out. It still cuts out when you hit the accelerator though. Do you think the main jet is to blame?
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