hey im planning on installing a cool head but im not sure what size domes to put on.... im at sea lvl,,,i ride mostly dunes and drag racing some trails,,, but i only run pump gas so can someone tell me what domes to put to get best performance..? i know i can run 20cc domes but i was wondering if i can run pump gas on 19cc domes...thanx

also what are good tyres to get for sand,,but i dont want to get flipper tyres cuz i ride on the road every now and then but i still want good grip on the sand...thanx again... any comments would b great

 

20's are probably the max, if you go to 19's it will be way to high of compression and will probably have detonation.

I was thinking 21's, but if you know you can run 20's then you should be ok. I run 18's at 4500 ft and up and it is great, but would surely cause problems at your elevation.