wrecker03 Posted May 21, 2007 Report Posted May 21, 2007 Got out to break in the fresh top end. Took 2 short rides. The first for about 10 minutes, just long enough to get hot then let it cool completly. Did the same a second time, never getting over 3/4 throttle.The Shee ran flawlessly, the jetting perfect. I was feeling pretty good so we hit the trails for a short ride. I took it easy but I got on it a little bit here and there and on the way back I started loosing power, let off the throttle and it died. After we towed it back to camp and let it cool enough to work on we pull the plugs. The left side was a perfect co-co brown, the right side had some aluminum on it so we knew it wouldn't be good. Pulled the head and the left side was perfect, the right side piston was seized and detonated. After a little investigation we found a tear in the boot between the carb and reed cage. The only thing we can figure is that there was too much air on that side and it got way too lean and boom. We were also a little puzzled by the coolant. There didn't seem to be any so again, it must've got so hot it boiled over what there was. Well, I have to get it back to running condition. I know I have to pull the motor. I have a couple of questions for the experienced guys. 1. Do I HAVE to split the cases? I was told that I can pull the motor and tear down the 1 side and clean it out possibly using a gas / oil mix in a spray bottle by basically slowly rinsing it out and listening for anything that sounds like it doesn't belong in there. They said to try this before tearing everything apart. 2. Do both cylinders need to have the same size bore? In my mind common sense says yes but again I was told no they don't that you can get away with a different size on each side. I'm hoping for just having to hone the cylinder. It looks bad but I won't know for sure till I get in there and start cleaning it out. Worst case is that I have to bore it out and I wonder if I can do one or do I have to do both? Quote
dajogejr Posted May 21, 2007 Report Posted May 21, 2007 I'd take this time to pull it all apart, clean out everything, have your crank checked and trued/welded if it isn't already. Crank bearings aren't fond of metal shavings...at least flush the bearings out with WD40, solvent, etc... Quote
Screaming Yellow Zonker Posted May 21, 2007 Report Posted May 21, 2007 I would not put 2 different size cylinders on your bike. That is more trouble than it is worth. The carbs will have to be jetted different and one might produce more power than the other and that can cause problems. Bore them both. Quote
dajogejr Posted May 21, 2007 Report Posted May 21, 2007 I would not put 2 different size cylinders on your bike. That is more trouble than it is worth. The carbs will have to be jetted different and one might produce more power than the other and that can cause problems. Bore them both. Holy Shit... I can't believe I skimmed over point #2... Yea, please use the same size pistons on both cylinders. I know .010 doesn't seem like much...but take into consideration how fast that motor spins. As Mr. Miagi said... "Balance, Daniel-san" Quote
wrecker03 Posted May 22, 2007 Author Report Posted May 22, 2007 Holy Shit...I can't believe I skimmed over point #2... Yea, please use the same size pistons on both cylinders. I know .010 doesn't seem like much...but take into consideration how fast that motor spins. As Mr. Miagi said... "Balance, Daniel-san" Like I said, common sense was telling me the same thing but that's why I came to the pro's. Well I guess my holiday weekend is planned. Quote
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.