sinbanshee Posted October 7, 2008 Report Posted October 7, 2008 im looking into building a +4 crank motor should i go with the powervale or cub setup im trying to keep this budget minded i will run pwk 35mm carbs and more then likely toomey t5s should i go stock piston or bigger to have a 421 and what would be more bennificial a long or short rod the bike is for mainly dunes and sometimes around the neighborhood Quote
Wildcardracing Posted October 7, 2008 Report Posted October 7, 2008 Cub vs. Cheetah will depend on what kind of power your looking for. The cub will be a little cheaper to build, but the port durations are very aggressive...some would describe it as a light switch type power band. The Cheetah in stock form has a smoother power band more orientated towards low to mid power. I recommend the 115mm (Longrod) crank as it creates less side-loading on the piston skirt and is therefore more reliable. You will want a 68mm bore to achieve 421cc. Quote
sinbanshee Posted October 8, 2008 Author Report Posted October 8, 2008 i do tend to like the lightswitch powerband keeps my on my toes lol is it worth going to a 421 over stock piston? Quote
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