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  1. #1 250cc twin won't start 
    C-Moto Noob
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    Apr 2017
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    new zealand
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    6
    Hey everyone I have a 250 cc inline twin quad 253fmm-c, it wont start.
    I have

    cleaned the carb 3 times
    fresh fuel
    new plugs
    checked valve timing and valve clearance, both right
    compression test 160 in both cylinders
    checked for spark , good spark in both

    Does anyone have any ideas, thanks
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  2. #2  
    motor maniac ShuBen's Avatar
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    Jul 2010
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    Beijing
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    742
    Airfilter?

    Sent from my GN8003 using Tapatalk
    SWM RS500R, R1200GS LC
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  3. #3 Re: 250cc twin won't start 
    Life Is Good! ChinaV's Avatar
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    May 2008
    Location
    Guangdong, China
    Posts
    1,476
    A little blast of starter fluid might be helpful to see if you're actually getting a strong enough spark. WD40 works in a pinch.
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  4. #4 Re: 250cc twin won't start 
    C-Moto Noob
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    Apr 2017
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    new zealand
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    Air filter is clean and I have tried it on and off thanks
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  5. #5 Re: 250cc twin won't start 
    C-Moto Noob
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    Apr 2017
    Location
    new zealand
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    I haven't tried starter fluid yet but I will give it go, the engine tries to go but won't Rev at all
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  6. #6 Re: 250cc twin won't start 
    C-Moto Noob
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    Apr 2017
    Location
    new zealand
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    6
    I put the carb through an ultrasonic bath but still no go, im out of ideas other than replacing all the electrics
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  7. #7 Re: 250cc twin won't start 
    C-Moto Senior
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    Sep 2011
    Location
    Sofia, Bulgaria
    Posts
    248
    Did you try playing with the air-fuel mixture screw on the carb? Is the plug wet after you crank it for a while?
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  8. #8 Re: 250cc twin won't start 
    C-Moto Noob
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    Apr 2017
    Location
    new zealand
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    Yes I have mucked around with it, what would you recommend a good starting point 1, 1/4 turns from fully wound in?
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  9. #9  
    motor maniac ShuBen's Avatar
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    Jul 2010
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    Beijing
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    Any former activity on inlet valves, e.g. adjustment? Maybe nearly no opening?
    Was camshaft out? Maybe timing is wrong. Happens easily by just missing one tooth or use the wrong marker on the fly wheel.
    I assume its somehow a timing problem.

    Sent from my GN8003 using Tapatalk
    SWM RS500R, R1200GS LC
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  10. #10  
    motor maniac ShuBen's Avatar
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    Jul 2010
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    Beijing
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    Oh, and check the connection between carb and cylinder. When u have air leakage there then u can play on the carb for ages

    Sent from my GN8003 using Tapatalk
    SWM RS500R, R1200GS LC
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