Engine Trouble Ring or something

Discussion in '2-Stroke Engines' started by Bertsimon, May 13, 2007.

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  1. Bertsimon

    Bertsimon Guest

    I have been hearing a lot of noise inside of the motor when i run it. It sounds like a lot of metal pinging around in the motor. It doesn t run the greatest just makes a lot of noise. No power and cuts in and out. Then it just kills. I removed the spark plug to find a lot of junk on it like metal shavings. What did I wreck, did burn out a ring or something like that?

  2. Guest

    Guest Guest

    Metal shavings on the plug? You would hope it's just a ring, but it may be toast.

    Tear it down immediately and see what you killed.
  3. JosephGarcia

    JosephGarcia Guest

    I also hear a small pinging noise coming from the main body of the engine somewhere, it doesn't affect power at all though. :???:
  4. gone_fishin

    gone_fishin Guest

    tech/mech is a VERY on-topic area...discussion of specific "original poster's" problem and possible solution only is what we're after in here.

    i agree, metal shavings in the cylinder spells "tear it down."
  5. rcjunkie

    rcjunkie Guest

    Metal shavings can be residuals from the engine's manufacture...seen this bunch of times already. Best is to take a peak and flush out what you can and tell us what kind of metal it is and what it looks like.

    I knew I had problems on my 150cc two stroke on my 30 year old golf cart because the shavings I discovered closely resembled bearing race material. Turns out the oil injection system failed and it was running on pure gas for a while.
  6. Guest

    Guest Guest

    I've seen a lot of metal shavings in model plane engines too, but that was BEFORE they were run. I think this is a little more serious.

    Let us know what you find after you tear it down. You should be able to find the source of the contaminant without too much problem, even if you've never been inside an engine.
  7. azvinnie

    azvinnie Guest

    l had the same pinging sound for awhile, but it didn't effect power untill now. power cuts in and out, l opened the engine and found a broken ring which chewed up the piston head and the crank arm bushngs were toast. lm looking for a new bottom tyo fix. also, trying to rip the engine right down to see how it all comes apart, seeing as how l can't run it anymore.....thanks thatsdax
  8. Bertsimon

    Bertsimon Guest

    Yeah I know I have some work on my hands I havent had time yet to touch it. The noise sounded like when a fender vibrates but its not the chain fender and i dont have any fenders on the bike..It would be real noisy then quit then come back. then it would slow down and you could hear metal moving around like something was banging around. I dont get it one day its running perfect then the next day it is pretty much junk . Cause the day before this happen i took the carb apart and moved the clip on the needle down a slot. I changed the gas mixture to 40.1 ran like a champ all day and lots of power. I parked it then the next day I went for a ride and there was no power then it got loud then it went all down hil from there. I had to pedal it home also which was really far. Got so tried of pedaling i had to walk . So I get home and took the plug out and it was black and full of crud I looked deeper into the plug and there was little metal shavings in there and one was blocking the plug which explains why i couldnt get it to start again.so maybe this week i lll have some time to take it apart. I ll get back to you folks when i tear it apart. Thanks for the feedback.
  9. woods39

    woods39 Guest

    have you ever greased the gears on the right side of your engine, under the cover plate?
  10. Bertsimon

    Bertsimon Guest

    Yes , and the gasket fell apart on me but I got some rtv stuff and sealed it back up. That was the second time I went in there and put some grease on those gears. They were dry to the bone the second also.
  11. Bertsimon

    Bertsimon Guest

    I tore it all apart today to find that the piston was shot. It took a chunk out of the top of the motor inside. One of the rings also got toren apart.The part that connects to the piston is also junk. So I guess I need a new piston set. can anyone tell me where I might get these parts.I would need to replace the top of motor where the muffler connects into.There is a chunk out of that inside. And I would also need a piston and everything that connects to that. am I better off just getting a new motor. I quess these little motors cant take very much abuse or they cant get too hot. If you ask me I think they are junk over all but they are fun so i want to fix or get a new one. Cause I had a blast on it.Should I go back to Dax or go elsewhere to find a stronger motor or are they all the same?
  12. gone_fishin

    gone_fishin Guest

    a lot of those questions you can answer yourself: did you do everything we've all figured out as far as break-in, pre-mix, gaskets, etc, etc? is it something you missed and you'd make out better starting fresh? this isn't smartypants stuff, just being philosophical...

    as far as how much to replace...my opinion: get the "short block" from dax, all ready to go. use the forum to make sure you cover every detail.

    keep us posted 8)
  13. Guest

    Guest Guest

    So you need a cylinder assembly, a piston 8.99, a ring and a connecting rod, once again, not sure. So you are up to around 50 dollars. Make sure you don't need anything else. How are the bottom end bearings?

    You'll have to clean the inside of the engine very thoroughly to make sure no metal chips ect are in there.

    I contacted dax for you to check on availability and price for the new engine without the ancillary items from the kit, I'll keep you posted.
  14. gone_fishin

    gone_fishin Guest

    bottom-end was my worry...sounds like a lottta junk got in there.

    dax sells the short-block (engine only) right on his site, have a look see for yourself.
  15. Bertsimon

    Bertsimon Guest

    Yes I have contacted dax he doesnt have all the parts I need so i am looking at getting another motor. I am not sure if I am going back to dax for it. I really didnt do anything for this to happen I think they are very cheap motors thats all. It just got hot one day and messed everything up. then it just went down hill from there.Still might just get another one from him cause they are that much fun. I ll just take it easy the next time around.
  16. Guest

    Guest Guest


    It wasn't because it was a dax engine, it was by your own admission, that it "got hot".

    No engine from any seller will take much "getting hot" before you have major problems with it.

    The reason it got hot will have to be determined, but I'd bet the intake was leaking or the carb wasn't on tight.

    Yes, they are "cheap engines" but so are ALL of these bike engines coming from China.
  17. Bertsimon

    Bertsimon Guest

    Yes there were a few things I did wrong. When I took it off the bike I did notice a lot of leakage by a bottom gasket. When I took off the four bolts on top they were really loose.I never tighten them after I got the motor. Anyways I order another motor from dax anyhow.
    so I ll be back to riding in no time.
    should I loctight those four bolts on top?
  18. Guest

    Guest Guest

    The head bolts?

    If I were me, and I am, I would just leave those alone, run the engine for an hour or two then GENTLY check them. (the idea here is to heat cycle the engine a few times then after it's COMPLETELY COOL check the torque on the head bolts.) Those are one of the few things I didn't loctite, those and the ones that hold the two case halves together. I just checked them all before I ran it.

    Don't get carried away tightening the head bolts as they are known to strip. I personally checked both my bikes and found that the head bolts didn't really need to be re-torqued after break in.

    If you have or can borrow a torque wrench, tighten them to around 25 foot pounds, no more. If you don't have one, then tighten or check them with your hand holding the head of the ratchet wrench.
  19. SpeedyG

    SpeedyG Guest

    or use a nut driver (screwdriver w/ whatever attachment fits) because you usually aren't gonna be able to strip out anything by hand.
  20. Guest

    Guest Guest

    Right on right on!