Yes, that's what I tried to ask... thaks for your reply.

john_bud, I think you are on to some thing, before I did the cam and head gasket swap I had a different jet's in the carb, after the swap I notice black spark plugs so I started leaning the carb' one step every time till I got nice brown plugs, I had to go 3 steps leaner in the power mode and 3 in the cruise mode lean, So I was running way too rich for a while, if you say carbon'ed up combustion chamber can cause that it might be the problem...

I tried to adjust the power valve to a higher number but it felt worse so I belive it was too rich.

I'll try some of the carbon remover products and go from there...

Thaks every one!