I've got a 2002, with a 2008 engine, Airsal BBK, malossi head, tecnigas next R, 19mm delorto, stock airbox with a couple extra holes, oil pump removed, running 3%.
Put about 300 miles on this top end taking it easy, not letting it really rev up that high, to break it in. After that I found when I open it up, it revs really high, starts feeling like it's running lean, and then starts backfiring and just running like crap. I've checked for leaks. Described it to a couple people and they say it's probably a timing issue.
I bought a timing light from harbor freight. But haven't had the time and energy to get into yet. So, if anyone has any tips or advice, I will be very grateful.