I have a 4mill stock cylinder drag poted by twistercrankshaft that is ahoot to ride if you mind the front wheels rarely touching the ground I also have a 10 mil both are duners
I have a 565 twister and I ride at about 1100 ft. My main is 168 needle is CEL 3rd clip pilot is 55 and the air screws are 11/2 out with39 pwks. Hope this helps.