Oil in exhaust pipe and tuning question

I'm breaking in new cylinder and pistons running 30:1 mix... is it common to have a lot of oil in the rear exhaust pipe?

Also, I just started to tune the carbs. Right now it seems to jump from 1/4 throttle to 3/4 throttle with no 1/2 throttle. I'm running a 735 JM blue ported (was a 760) engine with dual 44 carbs. I rejetted the carbs and replaced pop off springs based on recommendations for others on here.
TIA!
 
Last edited:
Top Bottom