What is the chain size on a Chinese 2 stroke engine

Discussion in 'General Questions' started by dougsr.874, Jun 10, 2010.

  1. dougsr.874

    dougsr.874 Active Member

    On the 80cc 2 stroke are they 410 or 415? and are they interchangeable?

  2. GearNut

    GearNut Active Member

    #41, #410 or #415 can all fit. It depends on the thickness of the sprockets. 415 sprockets are too thick to fit #41 or #410 chain. Other than that they are interchangeable.
    Also 415 sprockets can be ground thinner to fit #41 or #410 chain.
    While most kits come with #41 or #410 chain, there is not a set in stone standard with the same chain type each and every time. The factories seem to switch things up a bit as they please. Also, on some kits a #415 chain is too wide and will hit the case, behind the sprocket.
  3. AussieSteve

    AussieSteve Active Member

    Gearnut pretty well said it all. Some kits come with 415H chain while others have 410.
    Out of the box, my kit had 415H and the countershaft sprocket was a little too wide for 410. A bit of careful grinding fixes that.
    410 runs best, if you have really good alignment and if it fits the countershaft sprocket. There's almost no side-to-side movement on the sprocket and it fits the rear sprocket better as well. 415H is overkill, intended for 125 dirt bikes and similar.
    Apparently, though, 415 is more forgiving if alignment is slightly out.
  4. crassius

    crassius Well-Known Member


    read more, because you're screwing it up somehow

    410 chain might be OK for some builds, but 415h is usually used and doesn't give any weirdness

    I never have, and never will, use a spring tensioner.

    read more before you do more work or order more parts
  5. crassius

    crassius Well-Known Member

    415 is 1/16 inch wider that 410 - makes for easier fit AND for fewer alignment problems
  6. Jimmy Reed

    Jimmy Reed New Member

    I finally finished I will do it totally different next time, I hear these guys on youtube saying it took me 3 hours yea my ass Ha!!
  7. CrazyDan

    CrazyDan Active Member

    If you've got your sprocket/chain alignment spot on 410 is the way to go. Less rotational mass=less power loss=quicker acceleration.
  8. Rusty_S85

    Rusty_S85 Active Member

    Yep after getting my kit supplied tensioner installed I realized I was crazy for thinking about a spring tensioner. I only had to tighten the tensioner up twice since I started riding and now its in a happy medium. Just need to wait till my bicycle chain oil comes in so I can oil the chains up properly.