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Engine Failure 503

in 2 Stroke Technical Questions 12 years ago

  • Re: Engine Failure 503

    by » 12 years ago

    Geoff,

    Sounds like you are a little too rich in the midrange. I would try dropping the needle down one notch. lowering the needle will lean the midrange and raise the temps. Doing this will have very little effect on the top end temps if any.

    Bill.
      
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  • Re: Engine Failure 503

    by » 12 years ago

    I'm with you Bill.
      
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  • Re: Engine Failure 503

    by » 12 years ago

    You still haven't told us Geoff...how long have you operated this engine and did it ever perform as it should in your ownership,

    I know its go lots of hours on it but how many of them have you done with it.

    Nick.
      
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  • Re: Engine Failure 503

    by » 12 years ago

    Hi Nick l have only done 23.5 hrs since rebuild first ten hrs it ran fine it has got worse since
    l remove the barrels today and all check out fine clean, slight bit of carbon on pistons.
    l borrowed to new carbys today also and made no difference still has flat spot a 3000rpm.
    could the timming cause any of this..
      
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  • Re: Engine Failure 503

    by » 12 years ago

    Geoff,

    I would still try dropping the jet needle one notch. If that doesn't work, That leaves timing and exhaust. If you have access to a dial indicator and can get to the alternator without a lot of trouble, it is easy enough to check. The exhaust is one area a lot of people overlook. It is a tuned system and has a lot to do with scavenging the cylinders. A system that has been modified from the original, or is leaking or clogged can make a big difference in performance.

    Bill.
      
    Report
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