So I'm not sure if this has anything to do with my failure, but figured I'd run it by you guys to see what you think. I may be off base saying the bearing buddy failed, but what appears to have happened is the cap that plugs my fill hose came off and the hose puked some isoflex, and appears to have provided air thru the PTO side and leaned out the mixture.
This all occurred last weekend when the weather went from super cold in MI to mid 30's and a decent amount of snow on the ground (adequate cooling to the exchangers) all became very heavy. I was worried about cooking belts because you could feel the sled had to work a lot harder to turn the track. I'd compare it to riding the wheels off a 125 2 stroke at Baja MX (for you Michigan guys) it just felt like something was bound to fail. I was on the pipe (spinning about 8k) breaking trail in about 18" of the wet stuff, when the sled felt like it was running out of gas or a top end was cooking so I let the sled coast to a stop and killed the engine. I've blown up my fair share of 2 strokes to know better than to fight it and keep giving throttle or try to re-start it. Coolant temp was running 4 bars on the cluster consistently all day, never went retard mode or got hot. The motor spins freely, and feels like it has compression when pulling it over. Passed the trailside compression test (finger over plug hole), but just loaded it into the truck and got it home.
Put my gauge and tested compression cold the next day when I got home, and made about 130psi PTO side and 135 PSI MAG side. They're usually dead nuts 150 psi each (on the same gauge).
Do you think the bearing buddy had anything to do with it? Could the fill hose act like a snorkel and pull air into the cases or is there an inner crank seal that would prevent this? There is a yellow "haze" inside the y-pipe that possibly coule be from buring off isoflex? Both plugs came out too white for comfort, but the PTO side was nearly pure white, while the MAG side had some tan color and
I have not got into the bottom end, but replaced the top end about 1500 miles ago. Sled has a RK tek/Wossner pistons, head re shape, ECU reflash, v force reeds, and dyno port y-pipe, single pipe, and can. The top end did eat a set of reeds (1 petal each through both cylinders) about 750 miles ago. This left some minor imperfections on the skirts, but the cylinder walls and rings still looked beautiful from what the bore scope could show. Compression remained 150 psi in each before and after the reed failure.
Still in the process of tearing it apart, have yet to inspect the reeds or see what the pistons reveal when I get the cylinder off. Posting a few pics of what I described thus far...