Replacing crank seals?

Discussion in '2-Stroke Engines' started by woodchopper, May 17, 2009.

  1. woodchopper

    woodchopper New Member

    Yeah I did a search so save your breath on that matter.
    Basically I'm just wondering if there are any tip or tricks that would come in handy when removing and replacing the crank seals.Thanks,Alan

  2. srdavo

    srdavo Active Member

    hahahahaha There is Not a lot on info here on seals.... I assume to mean for your 2-stroke chinese engine? Replacement parts should be available from the seller.

    you might contact Ghost0 or AzBill about how-tos & tips.
  3. woodchopper

    woodchopper New Member

    Sorry,I meant to mention the engine is a Dax 70cc.I already have the seals I bought for my previous engine.It was a Boygofast that I decided to upgrade the bearings on.I managed to separate the crank and couldn't find a lower crank bearing to fit.Oh well.
    It was a good thing,Dax run much smoother.Alan
  4. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Yeah, so what happened so that you need to replace your seals?

    How old? many miles do you have on your engine?

    How did you diagnose the blown seals?

  5. fetor56

    fetor56 Guest

    Since the seals are from BGF & the engine is from Dax they probably won't fit.
  6. woodchopper

    woodchopper New Member

    Pushing 2,000 mi. on my Dax.Developed a erratic idle.Actually accelerates on it own with clutch in.This is not carburetor or throttle cable related.Maybe head,base,case gasket or seals.
    I haven't actually had a chance check it out.Been away from my bike.However I thought just in case,it wouldn't hurt to get the lowdown on changing seals.
    If you need proof of blown seals before addressing the question that might be awhile.Thanks,Alan
    Last edited: May 17, 2009
  7. fetor56

    fetor56 Guest

    Any questions previously directed at u have only been from the point of diagnostics & to make sure it doesn't happen again.Replacing seals is rare but not unheard of.
    Specifically my posts point being it's good having the knowledge but without the correct parts it's an excercise in futility.
    Someone will chime-in with exactly how to do it(hopefually with pics) so IF your going to go ahead concider NOW as being a good time to order from Dax.
  8. woodchopper

    woodchopper New Member

    Thanks fetor
    Like I said I'm not sure it needs new seals.However I do think I have an air leak.Had the same issue with a chainsaw.I suspect replacing the seals should be straight forward.But like just about everything,it never hurts to get get a little advice.Thanks,Alan
  9. spad4me

    spad4me Member

    The only thing that causes runaway acceleration is a sticking throttle slide, cable .
    Pull the air cleaner and actually look into the carb !
  10. woodchopper

    woodchopper New Member

    OK.I give up.The barrel in the carb must be sticking.
    Now on on a completely different note,does anyone have any advice on replacing crank seals assuming that they needed to be replaced.Thanks,Alan
  11. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Not true......
    An air leak will cause that condition and I had a customers bike that had a runaway acceleration a few days ago

    Didn't have time to find the air I had just helped him
    eliminate the chain tensioner as a free service because i am such a nice guy :devilish:

    his intake manifold was very loose....

    However the clue was that if the choke was full on it would slow it
    down but would not kill the engine

    Also when riding it if you pulled the clutch in it would rev up but would
    slow down again when you let the clutch out

    Test for leaks by spraying with carb cleaner onto the suspected areas
    I doubt if your seals need replacing......and if it ain't broke don't fix it
  12. Junster

    Junster Member

    I haven't had my motor torn down far enough to be of any help to you. But I do understand the question isn't about trying to diagnose what is wrong. It's "if I do try to change seals, what do I lookout for?" If you still have the old motor why not use it for the guinea pig tear down? Then post for me so I'll have a clue if I ever need to go there.