piston pics
 

06 300 with about 55 to 60 hours on the piston.

Pics aren't the greatest quality, there is some scoring on the piston side wall but I don't know if that is normal and from the power valve. ther eis quitre a bit of carbon build up above and below the rings. let see if I can post the pics

first pic is mid stroke

tdc

lines on left side can not be felt with a finger. Is it metal scoring or crud on the power valve "Polishing" the piston??

btw on a scale of 1 to 10 how cruddy is that power valve. 1 being like new, 10 being OMFG

ring grunge
Is this normal or is something leaking by.
Jetting too rich?

About 55 hours on piston, about half at stock jetting the other half at ltr 178 main 45 slow jet. last few rides with cck needle. 50/1 oil, mobil 1 2t

I think this is mid stroke again. less reflection from the flash

If I were you I would put the pipe back on, wash the bike till it is sterile and then put a new top end in it appears to be time. And yes oyru pwervalve appears to be dirty as well. I can't stress enough the need for lots of washing before a topend. The last thing you want to do is open your engine up and let a bunch of stuff fall into the bottom end.

Paul B