Yeah checked all the basics. The only excessive mod I did was drilling out the back silencer baffles. I got a little over zealous in trying to figure out my problems. Sounds nice though when running. Still has it inners. So maybe a lack of compression. Oh not sure if I mentioned when it was running, post new cdi, it had trouble at the bottom end of the gear but when the rpms got higher it ran smooth. The bottom end actedlike when you aren't giving enough gas in first gear start off. Like a lurching. Behaved that way at the bottom of all 5 gears.