Want to take bets?
Lean conditions will create more heat which in turn can cause a headgasket failure. But I'm still saying it was due to the headgasket the whole time.
Overheating still shouldn't cause bubbles in the overflow. More than likely they are exhaust gases.....Headgasket
First off let the bike warm up at idle, then pull the radiator cap and see if there are bubbles. Like decent sized ones. You should see turbulence or small bubbles because of vibration. Or easier yet and I learned this from Dez, take the bike to a mechanic and have them test your coolant for exhaust gases.
No bubbles at all. It gets hot right from warm up. I'm going to change the thermostat and order a Oem headgasket. Wish I knew about the cosmetic gasket while i was building it. Have 2 weeks to get it going good. Thanks for all the help I will keep you guys posted and what it was.
Dmc duals, Pro design intake
Hot cam stg 2, Big bore 778 stroker kit
Cp piston, msd blaster
Full skid plates
Trail tech vapor
Pro taper bars
450 front shocks
Flipped rear link