Alright , alright. The 510 is a fukin beast
The previous owner had taken out the cover thingie on the air filter and the cat in the exhaust, but no O2 sensor delete. Only took a little while to button everything up and go haul ass! It feels perfect now. The power is very traceable and smooth. The hesitation and drag is gone. Just instant wheelie or burning the rear tire down in the dirt. But it's very traceable? I guess. Manageable maybe? Whatever it is, it's fun!
The sporadic start is the clutch cancel switch in the lever
just have to pull t in alllll the way, sometimes twice, but then she fires up. Will probably just bypass it soon.