OH HARRY LAGMAN Thanks for the put down. First I didn't start the Super Tigre posts. And no I don't own a OS 50 . Second you better follow your own advice ,you spent your time at the field tinkering instead of reading the posts. What are you reading for anyway? Two members at our field have OS 50's and just loved them , but then late in our flying season they just puked. Early winter so I haven't seen them at the field to find out what happen to their engines. And the point is when a bearing breaks there is usally not much warning.