.21xp needle settings
here are my carb settings
hi spd =1 3/4 turn from close
mid= 2 turns from flush or almost 3 hours from closed
low= 1 turn plus 3hrs
So far this is the best result I have obtained from this motor.
this settings are with 30% nitro juice (similar to sidewinder in my opinion),
jp-2 pipe, mc-59 plug, spare head shim.
I will post differences with the 053 dyn pipe which I think will be better perf.