I had a boyesen rad valve reed get distorted........actually, a corner of it hung in the cage, keeping it partially open. Bottom end really suffered bad.......it also made it want to die alot. Just stuff to look for. You can also build a leak-down tester to test for leaks. I just did this recently, and found I had a leak. Believe it or not, it was a cylinder base nut that was properly torqued. I ended up putting some 3-bond down in the hole and all on the threads..........it stopped the leak. Let me know if you are interested in building a leak-down tester. After lots of experimenting, I know exactly what to buy. Probably run you about $30 or so.

Waylan

 

what is the compression on that engine ehh?
i can't understand that ding,ding thing yet...