As the title says it cuts out on left side at about 4k rpm. So far I've switched out with parts off from a perfectly running shee, stator, flywheel,coil,cdi, wiring harness. swapped carbs side to side, redid a leak down test holds 6lbs for over 30 min with no drop. changed jetting up and down still no fix.Im baffled can't find the problem .
wiseco 4mil crank
cheetacub with cleanup porting with case porting, done by fast racing.
v4 reeds
chariot intake
39mm pwks with 8" pods
cpi oofs
prodesign coolhead with custom domes by fast racing
+4* timing
170lb compression
runing 110 race fuel with amsoil dominator oil 40-1
any ideas?