Ok think i got it... what you all think?

definitely sounds healthier....what did you adjust?

Replaced front bearing, then closed idle and leaned bottom end

looks and sounds good. You could try softer clutch springs to put more load on engine Sonner? whatever you do don't mess with the low needle only the high open it if you have too. never lean it out with low % oil lube fuel. I bet the lean oil % wrecked the front bearing. you would never had to replace it with e more % oil lube. Good smoke trail ! the way to check front bearing for leaks is an oil trail under the flywheel.

Funny, I run 9 to10% oil and never had a failing front bearing.

"Good smoke trail" So, You just told us hes using more than enough oil in professional fuel. thanks

" I bet the lean oil % wrecked the front bearing" Wrong. I've had bad bearings from new... did they not use enough oil when machining the cooling head to cause the bad bearing?

Failing front bearing can be anything like a bad quality (as mentioned), dirt (common issue with offroad), unbalance on the clutch or a too tight gear mesh. Also a binding in the whole drivetrain or a too heavy gearing can put huge sideway loads on the front bearing.

Sounds good but bear in mind that you don't have space in your yard for proper testing. The tuning changes as the engine gets to working temperature (which varies between different engines). The tuning should be reliable to hold for at least 15 min with 1 refueling without dropping performance or having flameouts.

I have seen often cars working great at 5min qualification heats, and then having several flameouts in 30 minutes finals.