Drained oil out of both my 450s last night. Both drain plugs and filters. Let set 24 hours and put scott filters back in and little more than a quart in each bike. started one and let idle for about 2 minutes. shut it off and started other bike and let idle and then shut it off. Went back to first bike and checked oil level and just right. Went to 2nd bike and checked and NO oil on dipstick. Added more oil and started it. Let sit a minute or 2 and still none on stick. Pulled oil filter out and cranked it slowly, oil came out the large hole into filter housing. Put cover back on without filter and started it. Still no oil on dipstick!!! Put filter back in and started. let sit 2 minutes and still no oil on stick. I have had yzfs since 1998. Not new to these things. I change oil every 2 hours ( hour Meter). No new clutches since last year. Any thoughts???????????