it's the problem with drilling start.
it require special maintenance with its one way bearing.
one way bearing is very sensitive to dirt and excesive oil.
they need to be lubed properly and will slip with inproper lubrication even can damage it.

i had enough with one way bearing and stay to put it away from me.
i've struglling with my old monster truck that use one way bearing in the tranny.
if you had enough with one way bearing in drill start, get a proper starter box.
it will help you a lot.

Rockman, your carb setting is different than others. it might be your air environment that differ too.
like air humidity or else will affect the carb setting. o yea don't forget the weather you have there.
the important thing is your engine temp is good and it perfom well and that's it. you don't need to care about how lean it is or how rich it is.

Just enjoy this thing