Hi everyone, Quick background on the saw. I just went through my 028AV Super, replaced piston/ring for scoring, carb kit, all the rubber hoses, filters, muffler mod, and down sized to a 16" from 24". Got the saw running with no problems. One nagging problem is the saw bogging down under a load which I had prior to freshing up. Started out with 1 1/8 on low, and 1 on high which started after 4 pulls. Did WOT adjustment according to this site experts. The saw starts easy but at times very hard. Sometimes pull cord locks up (painful when drop starting...). I did notice some rubbing marks on the flywheel with the mag pick-up (possible play in the crank from worn seals or bearing?). Didn't notice any excessive play on the flywheel side. Also noticed the carb spit-back quite a bit more than before. Jocking the throttle without load varies from nice quick transitions to bogging at times. I did rotate the saw 90 degree each way while running and didn't kill the saw. Without performing crank case vacuum/pressure test, is there any easier test. I've heard about spraying WD-40 behind the flywheel? I guess this means after you get the saw started, take the cover off the expose the flywheel? At this point, I was just thinking about replacing it anyway. I read about the knot on small rope trick to lock the cylinder to losen the flywheel nut (left hand threads). My concern is the clutch side where special puller is needed. Any recommandations on the tool issue? Any tips on getting the seal out without spliting the case (hoping for good bearings)? Thanks for your inputs.