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Thread: Bike wont start? READ THIS! Four Stroke/General ATV Troubleshooting guide

  1. #1
    0GravityMX is offline BANNED, For scamming and circumventing previous bans. First time rider
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    Exclamation Bike wont start? READ THIS! Four Stroke/General ATV Troubleshooting guide

    in response to Dirtcrashers thread and ideas from billy and dammit! i thought id post this:
    Engine Doesn’t Start, Starting Difficulty:

    Starter motor not rotating:
    Starter lockout or neutral switch trouble
    Starter motor trouble
    Battery voltage low
    Relays not contacting or operating
    Starter button not contacting
    Wiring open or shorted
    Ignition switch trouble
    Engine stop switch trouble
    Main fuse blown

    Starter motor rotating but engine doesn’t turn over:
    Starter motor clutch trouble

    Engine won’t turn over:
    Valve seizure
    Rocker arm seizure
    Cylinder, piston seizure
    Crankshaft seizure
    Connecting rod small end seizure
    Connecting rod big end seizure
    Transmission gear or bearing seizure
    Camshaft seizure

    No fuel flow:
    Fuel tank air vent obstructed
    pet cock clogged
    Fuel line clogged
    Float valve clogged
    Out of fuel

    Engine flooded:
    Fuel level in carburetor float bowl too high
    Float valve worn or stuck open
    Starting technique faulty
    (When flooded, crank the engine with the throttle fully open to allow more air to reach the engine.)

    No spark; spark weak:
    Battery voltage low (only on certain bikes EX: KLT's)
    Spark plug dirty, broken, or maladjusted
    Spark plug cap or high tension wiring trouble
    Spark plug cap not in good contact
    Spark plug incorrect
    IC igniter trouble
    Neutral, starter lockout
    Pickup coil trouble
    Ignition coil trouble
    Ignition or engine stop switch shorted
    Wiring shorted or open
    ignition rotor/pulse generator gap.
    On Hondas, it's possible to assemble the ignition rotor 180 degrees out of phase with the advance weight plate - causing the spark to occur at the end of the exhaust stroke.



    Compression Low:

    Spark plug loose
    Cylinder head not sufficiently tightened down
    No valve clearance
    Cylinder, piston worn
    Piston ring bad (worn, weak broken, or sticking)
    Piston ring/land clearance excessive
    Cylinder head gasket damaged
    Cylinder head warped
    Valve spring broken or weak
    Valve not seating properly (valve bent, worn, or carbon accumulation on the seating surface)

    Poor Running at Low Speed:

    Spark weak:
    Battery voltage low
    Spark plug dirty, broken, or maladjusted
    Spark plug cap or high tension wiring trouble
    Spark Plug cap shorted or not in good contact
    Spark plug incorrect
    IC igniter trouble
    Pickup coil trouble
    Ignition coil trouble

    Fuel/air mixture incorrect:
    Pilot screw maladjusted
    Pilot jet, or air passage clogged
    Air bleed pipe bleed holes clogged
    Pilot passage clogged
    Air cleaner clogged, poorly sealed, or missing
    Starter plunger stuck open
    Fuel level in carburetor float bowl too high or too low
    Fuel tank air vent obstructed
    Carburetor holder loose
    Air cleaner duct loose

    Compression low:

    Spark plug loose
    Cylinder head not sufficiently tightened down
    No valve clearance
    Cylinder, piston worn
    Piston ring bad (worn, weak, broken, or sticking)
    Piston ring/land clearance excessive
    Cylinder head warped
    Cylinder head gasket damaged
    Valve spring broken or weak
    Valve not seating properly (valve bent, worn, or carbon accumulation on the seating surface)

    Other:
    Engine oil viscosity too high
    Drive train trouble
    Brake dragging

    Poor Running or No Power at High Speed:


    Firing incorrect
    :
    Spark plug dirty, broken, or maladjusted
    Spark plug cap shorted or not in good contact
    Spark plug incorrect
    IC igniter trouble
    Pickup coil trouble
    Ignition coil trouble

    Fuel/air mixture incorrect:
    Starter plunger stuck open
    Main jet clogged or wrong size
    Jet needle or needle jet worn
    Air jet clogged
    Fuel level in carburetor float bowl too high or too low
    Bleed holes of air bleed pipe or needle jet clogged
    Air cleaner clogged, poorly sealed, or missing
    Air cleaner duct poorly sealed
    Water of foreign matter in fuel
    Carburetor holder loose
    Fuel tank air vent obstructed
    Fuel tap clogged
    Fuel line clogged

    Compression low:
    Spark plug loose
    Cylinder head not.sufficiently tightened down
    No valve clearance
    Cylinder, piston worn
    Piston ring bad (worn, weak, broken, or sticking)
    Piston ring/land clearance excessive
    Cylinder head gasket damaged
    Cylinder head warped
    Valve spring broken or weak
    Valve not seating properly

    Knocking:
    Carbon built up in combustion chamber
    Fuel poor quality or incorrect
    Spark plug incorrect
    IC igniter trouble
    Worn piston/rings
    bad connecting rod
    Exhaust Smokes Excessively:

    Black smoke:

    Air cleaner clogged
    Main jet too large or fallen off
    Starter plunger stuck open
    Fuel level in carburetor float bowl too high

    Brown smoke:
    Main jet too small
    Fuel level in carburetor float bowl too low
    Air cleaner duct loose
    Air cleaner poorly sealed or missing

    Blue smoke:
    worn Cylinder/piston/rings
    Blown head gasket
    Too much oil in crankcase
    Worn valve guides/seals

    Handling and/or Stability Unsatisfactory:

    Handlebar hard to turn:
    Steering stem locknut too tight
    Bearing damaged
    Steering bearing lubrication inadequate
    Steering stem bent
    Tire air pressure too low

    Handlebar shakes or excessively vibrates:
    Tire worn
    Swing arm pivot bearing worn
    Rim warped, or not balanced
    Wheel bearing worn
    Handlebar mounting bolts loose
    Steering stem head bolt loose

    Handlebar pulls to one side:
    Frame bent
    Wheel misalignment
    Swing arm bent or twisted
    Steering maladjusted
    Front fork bent
    Right/left fork legs oil level unbalanced
    unbalanced tire pressure

    Shocks:
    (Too hard)
    Front fork oil excessive
    Front fork oil viscosity too high
    Tire air pressure too high
    Front fork bent

    (Too soft)

    Front fork oil insufficient and/or leaking
    Front fork oil viscosity too low
    Front fork, rear shock absorber spring weak
    Rear shock absorber oil leaking

    if theres anything else i should add let me know
    Last edited by 0GravityMX; 09-07-2010 at 10:25 PM.

  2. #2
    haggard 2hundie's Avatar
    haggard 2hundie is offline Would rather be at the front of the train than Arm chair racerJust too addicted
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    awesome let me be the first to say thank you !

  3. #3
    Join Date
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    Texas
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    Can I add a few?

    * Out of gas.

    * On Hondas, it's possible to assemble the ignition rotor 180 degrees out of phase with the advance weight plate - causing the spark to occur at the end of the exhaust stroke.

    * A weak spark can also be caused by incorrect ignition rotor/pulse generator gap.

  4. #4
    0GravityMX is offline BANNED, For scamming and circumventing previous bans. First time rider
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    10-4 added to list

  5. #5
    Join Date
    Sep 2010
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    valdosta GA
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    U wouldn't have a chassis wiring diagram for that 85 klt 250 would u I have a 85 klt 200c

  6. #6
    Ironbnder's Avatar
    Ironbnder is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Alexandria, La
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    Bike wont start? READ THIS! Four Stroke/Gen. Guide to the Guide Please

    The thread I am refering to is a great thread. Please lets not cludder it up with meaningless post. Add usefull information that will help others, but lets leave out opinions and uninformative comments. If you have a question for someone, please use the Private Message feature.

    And for the which hunters, maybe this is not my place to be a thread police, but I love 3ww and just want it to grow and stay great. I am here for the long haul.

    **Moved into here by mods.
    Last edited by Ironbnder; 09-27-2010 at 01:07 PM.
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  7. #7
    Join Date
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    Manitoba Canada
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    I have one for "starter motor turns but engine doesn't turn over" somewhat common in 250es/sx is the teeth in the reduction gears to be chipped or broken off. Most often due to too thick of oil in too cold of climate.
    Last edited by Thunder God; 05-24-2013 at 11:06 AM.

  8. #8
    Join Date
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    Thanks for the info. great job....

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