G'day All,
I've has my OS-TR for about a year. I have been very happy with it. However I haven't been able to finish a race for the last three meetings. Any sort of bump and the engine just stalls. I have replaced plugs but still the same problem.
The compression is pretty poor now and I'm wondering if that is the problem. If so what tools do I need for a rebuild or is it cheaper just to buy a new engine? My feul consumption is through the roof too.

I would appreciate any advice.