Break In done breaking in yesterday... drove like maniac today!! Help

Discussion in '2-Stroke Engines' started by woods39, May 6, 2007.

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  1. woods39

    woods39 Guest deleted

  2. Vongould

    Vongould Guest

    engine trouble

    just a tip, these are not high performance engines and they should never be ran full throtle. If you want it to last you should not drive over 5000 rpm or so.
  3. rcjunkie

    rcjunkie Guest

    My throttle has only two settings, idle and full throttle. I ride at nothing but full throttle with NO problems. A decent two stroke should easily hit 10,000 rpm but ours are limited by modest port timing and lack of a reed valve :-(

    Woods, check for airleaks. If no airleaks, pull the jug and take a peak. If piston is not scuffed and jug is ok, replace the rings and try again. Sounds like you may have run your engine lean and overheated it. Running full throttle wasn't your problem, running it too lean may have been.
  4. Guest

    Guest Guest

    I won't tell you that was an expensive lesson. You weren't anywhere near being broken in.

    Does it start up, O.K.?
    How does it feel when turning it over slowly?
    You could have put a hurtin' on any of a number of internal components.

    I doubt you did anything to the rings, unless you broke one, but you'd see that. Scuffed piston? Look at the exhaust side closely. (look for marks or discoloration on the skirt, below the rings) Cylinder wall? Once again, look very closely. (verticle marks, discoloring, it doesn't take much)

    You may have warped the jug (made it out of round) or head.
    How does the compression feel compared to "new"?
  5. woods39

    woods39 Guest


    yes there are scuff marks..... but not at all deep just marks... I have my carb pin set on the second one down, slot two. Should I move this down to the 3rd on the next engine? It still starts and runs.. about 10 mile an hour. No leaks... used wd40 to check for leaks... does it mean it is broke?
    Im not too worried the guy said send it back for a new one since its under 30 days...
  6. Guest

    Guest Guest

    A couple of things- "light scuffing" is all it takes sometimes....

    Now, I don't know who you got the engine from, or how they'll handle it, but consider yourself lucky if they replace it under warranty, especially if they read here that you beat the crap out of it (I believe the tech term here would be "improper break-in proceedure") after just two tanks of gas. That was way too early to run it that hard really.

    What mix ratio/brand of oil did you use for break-in?
  7. Guest

    Guest Guest

    P.S., Yes, start at the second from the bottom with your clip next time.
  8. rcjunkie

    rcjunkie Guest

    Glad to hear you are getting a new block under warranty.
  9. SlicerDicer

    SlicerDicer Guest

    speaking of crazy RPM's the main problem behind crazy RPM's is the heat right?

    And it can melt copper at those temps on the engine? I am not sure but can it?
  10. Guest

    Guest Guest

    Not sure what you mean there....heat will not cause crazy rpm's, but crazy rpm's will cause a lot of heat, so will running it really hard before it's broken in.

    No, you can't get one hot enough to melt copper. (1900F)
  11. gone_fishin

    gone_fishin Guest

    Re: done breaking in yesterday... drove like maniac today!!

    what's this mean?
  12. SlicerDicer

    SlicerDicer Guest

    Re: done breaking in yesterday... drove like maniac today!!

    Wild guess admit to overrevving = voided warranty?
  13. Guest

    Guest Guest

    Shhhh, you just blew his cover. :wink: