Don't know which cylinders I should go with for trail riding and playing around in fields etc. Cheetah cub 421 (68mm bore +4mil stroke), cheetah with power valves, or stock cylinders with big bore sleeves. I currently have stock cylinders that are ported for the 4mil with 4mil long rod crank, 15:1 comp, vforce2 reeds, timing +4, r2 pipes, bored stock carbs, airbox modded, and case ported. Just looking for some more hp. I guess the cheetah with power valves use cr250 reeds while the cub uses the stock reeds. Which setups have you guys used and had good luck with? Thanks.