rev it up on the go and slowly revs come down why

Discussion in 'General Questions' started by skyash, Jul 7, 2015.

  1. skyash

    skyash Active Member

    when i start my bike it will not idle till it warms up then it will fine when i get up to eny speed it keep hi revs then they come down slowly back to idle ..need help ...
     

  2. butre

    butre Well-Known Member

    if it takes a while to idle down that probably means you have a vacuum leak somewhere. if not around the carb then somewhere else
     
  3. skyash

    skyash Active Member

    so if i spry wd.40 or water on motor may be find leak ?
     
  4. crassius

    crassius Well-Known Member

    yes, just spray around the intake pipe
     
  5. skyash

    skyash Active Member

    all good did that and it made a funny noise where the carby gos on the intake pipe its a new one steel not that stock rubbish ..thanks...
     
  6. crassius

    crassius Well-Known Member

    those steel intakes often have a bit of a lip on the end where the chrome was put on - I sometimes need to file it a bit right there to get a good fit for the carb
     
  7. Waxxumus

    Waxxumus Member

    This is why you spray with a little carb cleaner.
    The rpm will rise if its an air leak.
     
  8. Waxxumus

    Waxxumus Member

    or just get rid of that stock nt carb. its a 50 cc carb on a 66 cc engine.
     
  9. crassius

    crassius Well-Known Member

    the old speed carb was a millimeter or 2 smaller & was the 50cc version
     
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