boonman Posted January 12, 2004 Report Share Posted January 12, 2004 Case debris in a two stroke doesn't get past the rings. It goes up to the combustion chamber through the transfer ports. It's not like a four stroke. In a two stroke, the tranny oil is in the tranny. The lower end of the motor itself has no oil. That is why you mix oil in the fuel. I am thinking that a lower rod bearing may be coming apart in your motor. Either that, or you inhaled some debris into the motor. But, this should show up on both cylinders. Are the skirts of the piston in good shape?? The shop you toook that motor to there Sandbuzzard should be shut down. The material in your tranny oil could have likely been clutch debris. It could be some of the teeth on the gears coming off as well. You need to pull that motor apart and have the crank inspected. Whenever there is debris and pitting on the piston and head, then whatever was in the combustion chamber was down into the crank as well. It has to go there no matter what. Unless a ring came off.......... Either way, please don't take the chance..... Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 12, 2004 Author Report Share Posted January 12, 2004 Nighty, i don't see how water could of did this sorta damage, and plus it was in my shed the whole time, Boonman, I will be taking the bottom end apart in a couple days to see if i can see anything, but all my bearings seem fine but im gonna check them out as well, and my left piston skirt had 2 deep scratches in it on the intake side, but my right piston is fine it has no scratched what so ever, and the top of it has no dings in it either, all the damage is on the left side, I'v looked into the crank,down in the cases through the slot and there is no metal pieces down there either, this thing is beating the hell outta me, because i can't figure out what went wrong. Thanks for all the help, Jonathan Quote Link to comment Share on other sites More sharing options...
Banchetta Posted January 12, 2004 Report Share Posted January 12, 2004 Are the rings fully intact??? No pieces missing?? Grab your header pipe and shake it. The piece that caused this might be in the exhaust... Quote Link to comment Share on other sites More sharing options...
boonman Posted January 12, 2004 Report Share Posted January 12, 2004 Whatever debris that caused the damage will likely be gone by now. The damage however, is already done. I am willing to bet that some if not all of it went through the crank bearings. Think of how many revolutions were made in that motor since this happened. i bet there has been no visible debris in the motor for a little bit. Once it does it's thing, it gets sucked out of the pipe.... Quote Link to comment Share on other sites More sharing options...
ruff_rida69 Posted January 12, 2004 Author Report Share Posted January 12, 2004 Banchetta, yes both of the rings are there and there fine, I guess im just gonna take the bottomend apart and check the bearing and then get a new bore and some new pistons and head and start putting it back together, because i don't know what else to do. Quote Link to comment Share on other sites More sharing options...
boonman Posted January 12, 2004 Report Share Posted January 12, 2004 Your crank may let go soon. And take out your new top end. Mine diid. I blew a hole in the piston, and cleaned the crank out the best I could. I put it back together, and the crank threw a lower rod bearing shotly thereafter. Good luck.... Quote Link to comment Share on other sites More sharing options...
Banchetta Posted January 12, 2004 Report Share Posted January 12, 2004 I had a lower rod bearing that was tight once.. It would move, but it was stiff. It was my first shee and didn't know shit. I put the top end together and the bearing let go....But it went all at once....I also rushed a top end job on one of my other shees and went to put the carbs on and noticed I was missing the hose clamp for the fuel line.....I said hell w/ it and ran w/o one... I got about 15 minutes on the new motor and blew it up...Guess where the clamp was.... Took it apart, rebuilt it again, put the carbs on and guess what, the new clamp was now missing, I pulled the carb back off and felt inside the reed cage and there it was.... Sorry for the book, but if you were whacking metal off the intake, then there is a good chance that a large piece of metal went inside the intake and Whalla!!!! Check the header pipe though. I've seen broken rings stay in the header after a 6th gear wot run to a dead stop and never came out.....found many pieces of metal in the header pipe and most of the time the culprit....good luck and let us know how you make out....W/ enough examining, you'll find it....BTW, half my hose clamp was in the header and the other half was in the top of the piston.. Quote Link to comment Share on other sites More sharing options...
Nighty Posted January 13, 2004 Report Share Posted January 13, 2004 The reason i said water: I know that if water is compressed in you compression chamber that it will burn holes in your piston and head. Pieces of metal might have come of and caused the damage you have now. On the other hand it might be one of your bearings. Quote Link to comment Share on other sites More sharing options...
909 Posted January 17, 2004 Report Share Posted January 17, 2004 Ruff, I know you're gonna feel like you were asked the same thing a bunch of times and you checked but this is for your own good here. I had the exact same thing happen but on my shifter cart. I was going crazy because I couldn't figure out what caused the dings in the heat and the score marks in the piston. Turns out a small piece of the wrist pin clip broke. I didn't notice it 'till a buddy insisted on me checking both clips to each other. Sure enough 1 was about 2mm short on one side. That piece was bangin around in there for a while before it finally got wedged between the piston and cylinder, scored the cylinder up bad, caused enough pressure to crack the intake bridge then finally sieze. If you find out what came apart you'll sleep better at night knowing the cause was found and fixed, or replace everything! Good Luck! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.