Reving out

Discussion in '2-Stroke Engines' started by Callum2461, Feb 12, 2014.

  1. Callum2461

    Callum2461 New Member

    Ok so this is the 3rd time I have been on here after countless problems with my brand new 2 stroke 70cc bike. Now when It gets up to a certain speed, I don't know let's say 25km/h, it revs out (makes the same noise it makes when It reaches it's max speed) it's like a scratching sort of noise like when I go too fast and have to back off the throttle. Could anyone please give me a diagnosis??? Thanks for any help :)

  2. Fabian

    Fabian Well-Known Member

    Engines are not supposed to make scratching noises.
    Maybe it has something to do with the fact that the engine was revved out excessively.

    It's a problem that only money can fix.
  3. Fabian

    Fabian Well-Known Member

    Count yourself lucky that you've only been back here 3 times.
    If i were to tell my story, we'd be talking for the next 2 months.
  4. jaguar

    jaguar Well-Known Member

    take off the clutch cover to look and see if anything is abnormal (loose screw, etc).
    make sure your chain has the right tension. when too loose it can hit the cases at the top of its entry space. that only happens at top revs
  5. Callum2461

    Callum2461 New Member

    Thanks everyone for your help. My chain does look a bit loose so maybe I will tighten it to see if that helps.
  6. wheelbender6

    wheelbender6 Well-Known Member

    Like Jag said, the scratching noise usually indicates a clutch issue. Something in the clutch needs to be tightened or adjusted.
  7. HeadSmess

    HeadSmess Well-Known Member

    i ignored my scratching sounds until the crank gear screw popped out the side :)

    from the sound of the post... your flower nut has come loose, is rubbing, and the clutch is slipping slightly just to add to the drama...