2 stroke Jack shaft kits. What are my options?

Discussion in 'General Questions' started by bikejock, Sep 2, 2015.

  1. bikejock

    bikejock Member

    I'm looking to do a 66/80cc 2 stroke build for my next bike and I would like to be able to shift to go faster but I only see jackshaft kits for 4 stroke kits mostly because from the looks of it, it's easier to adapt a jackshaft to a 4 stroke transmission (like the 4G or 7G) but the 2 stroke drive seems different and difficult to adapt for a jackshaft.

  2. butre

    butre Well-Known Member

    sickbikeparts makes the best jackshaft for 2 stroke engines. other jackshafts kits exist but most if not all are low quality copies of the sickbikeparts jackshaft
  3. bikejock

    bikejock Member

    What would be the fastest reachable speed with a jackshaft on a 66cc 2 stroke on an 8 speed bike?

    I was also thinking of a few other mods like a high compression cylinder head & a racing carb.
  4. 2old2learn

    2old2learn Member

    Mid 30's to low 40's could be expected.
  5. bikejock

    bikejock Member

    Those are the speeds I'm hoping to achieve. I'm looking to be able to do 40 at most. Any faster would probably be hard on the engine and bike since 2 strokes vibrate more than most engines.
  6. butre

    butre Well-Known Member

    how fast it goes depends on how you gear it and how modified your engine is