I know this thread gets more views than the Expy/Freestyle thread so I'll post here as well. So this last weekend my Expy 550 came to a grinding halt with only 3000 kms on it. Man it sure isn't fun getting an engine out of an XP! But anyways, I got it apart and the top end is still perfect. The outer PTO side crank bearing is piled up. I see that up to 2010 that bearing was lubed using isoflex grease and is sealed from the crankcase chamber only by a sealed bearing. On the 2012 parts diagram it isn't clear if it uses isoflex grease or if it is lubed by the two stroke oil. The hole going through the crankcase to the bearing is plugged by a steel ball so I assume its supposed to be greased. It was bone dry so as far as I can tell, someone at Skidoo forgot to put the grease in it. Anybody know for sure if this is an isoflex bearing?