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Thread: 85 ATC 350X Driving me crazy.

  1. #1
    Join Date
    Oct 2018
    Location
    Michigan
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    85 ATC 350X Driving me crazy.

    I seem to have the same problem as many others. My 3Wheeler won't start. The oddest part about it is; after what seems like 300 kicks, all of a sudden it starts! When it is running is seems to run great. Very powerful, will settle down into a nice idle, good throttle response all good right? Shut it off, come back another day, NO START! After what seems like 500 kicks nothing. I have actually gotten it to start only 3 or 4 times. Replaced the carburetor, adjusted the de-compressor, the readings all seem within acceptable range, (coil, ECM etc.). The spark does seem to be a little weak, but there is spark. YIKES. Any thoughts. Thank you for any insight. Spring is coming and I want to ride it.

  2. #2
    Join Date
    Mar 2010
    Location
    Slidell, LA
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    4,737
    Tap on the CDI box with the handle of a screwdriver or a small . Then try to start. Also make sure your on/off contacts are good/clean in the switch housing.
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  3. #3
    Join Date
    Jul 2018
    Location
    TN
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    1,065
    Exactly, it's probably a no spark or very weak spark. You can have a 'visually good' spark that's still weak. Sparking in open atmosphere is NOTHING like sparking under compression.
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  4. #4
    fabiodriven's Avatar
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    Join Date
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    Quote Originally Posted by Gabriel View Post
    Exactly, it's probably a no spark or very weak spark. You can have a 'visually good' spark that's still weak. Sparking in open atmosphere is NOTHING like sparking under compression.
    Just last week I had an engine that had weak spark and wouldn't run. You could see the spark, and it shocked my friend, but it was not enough for the machine to run.
    85 Tri-Zinger 60
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  5. #5
    Join Date
    Jul 2016
    Location
    Kentucky
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    61
    Replace the easy stuff. New CDI, plug, etc. I’ve had bikes in the past that had valve problems and wouldn’t start. Might check the valve gap being sure you’re TDC on the compression stroke. If the valves aren’t right it could possibly run but be a booger bear to crank.

  6. #6
    Join Date
    Dec 2011
    Location
    central oregon
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    78
    Had same issue before you replaced carb? Im guessing but gotta ask...
    Twin 1982 ATC200's
    1985 350X
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  7. #7
    Join Date
    Jan 2010
    Location
    Sulphur Springs,Texas
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    1,005
    I had a issue similar to this but all it needed was a new spark plug.
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  8. #8
    Join Date
    Apr 2014
    Location
    Edmond, KS
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    2,531
    I'd second the valve check. It's free and sure won't hurt anything.

  9. #9
    Join Date
    Oct 2018
    Location
    Michigan
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    6

    Thnx.

    Quote Originally Posted by Hondatcs View Post
    I had a issue similar to this but all it needed was a new spark plug.
    Thnx to all who responded. I will try your suggestions. Wish me luck. Can't wait to ride this beast.

  10. #10
    Join Date
    Aug 2008
    Location
    devore,ca
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    1,015
    The 350x has a definite starting sequence. Once you learn it they are a lot easier to start. Make sure you are just past the compression stroke top dead center and give it a good kick.
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