66cc not idleing and very slow!

Discussion in '2-Stroke Engines' started by tskrem, Nov 11, 2009.

  1. tskrem

    tskrem Member

    hey this is my first build, and have been riding it for a while..
    since i built it it never idled without me revving it, and is pretty slow. my mates 48cc absolutely owns my bike.. even up hill... i'm on my 5th tank. i was running it at 20:1, then 16:1 now gonna try 25:1.
    post some pictures soon... also I've tampered with the idle screw and the connection were the throttle connects to the carbi.. its not that...
    ill post some pictures up soon. cheers, Tax
     

  2. AussieSteve

    AussieSteve Active Member

    The first thing to do is to ensure that the carby is sealing correctly on the intake tube.
    Some use an o-ring, but it could still leak so I prefer to use sealant - Permatex Form-A-Gasket #2, (Non-hardening). I just put a smear into the base of the carb's inlet opening then quickly push the carby on and tighten it up. (Don't use too much.)
    Also, check that the gasket mounting the intake tube to the barrel is intact and that the nuts are tight.
    From what I've read on this site these are the most common causes of low power and bad idling.
    I've heard that spraying brake cleaner toward any suspected leaks with the engine running will alter the idle if there's a leak.
    Does it run better with the choke partly on?
    ... Steve
     
  3. andynogo

    andynogo New Member

    Not idling and pretty slow could be super rich. Drop the carby needle a notch or two (raise the clip) and see what difference it makes. Plenty of threads on here for this sort of problem.
     
  4. AussieSteve

    AussieSteve Active Member

    Another good suggestion andynogo. After sealing everything properly on mine, it was running rich and needed the needle lowered a notch. It won't rev out fully still, (I calculate 5540 RPM), but I haven't tried the needle on it's leanest setting yet. Still running in - 212km on clock, so I've only revved it out a few times, for a couple of seconds each time.
     
  5. tskrem

    tskrem Member

    i dont get the bit in bold.. lol im a little noobie
     
  6. AussieSteve

    AussieSteve Active Member

    I can't really make it much clearer without pulling mine apart and taking photos. Undo the carby from the inlet tube and remove it. Put a smear of sealant in the bottom of the carby inlet opening where it seats on the inlet tube, then re-assemble.
    You can get Permatex Form-A-Gasket #2 from Super Cheap Auto. It's a non-hardening type, resistant to petrol, (gasoline, for those in the US).
    For the o-ring method, try a search using o-ring as a keyword. It's been covered in many threads. (Easier assembly/disassembly, but not as reliable a seal.
    Hope this helps.
     
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