thesoultaker2117 Posted November 21, 2012 Report Share Posted November 21, 2012 Its a general rule of thumb..... there are-however-exceptions. As for a stock cylinder, I don't think you could move enough volume of air to warrant big bore pipes usefull. Why are you sticking with stock cylinders? If stock cylinders are your top choice, I would not run 68mm bore on them. While you DO increase in displacement (68mm X 58mm) 421 vs. (65mm X 58mm) 385cc... not even close to 411cc by the way... the larger sleeves push into the transfer ports and coolant passages. IMO, you'd probably make more reliable power just having them drag ported by a reputable builder. If fast is your goal, it comes down to WAY more than the size of your motor. The secret to hard running motors is the entire setup. All the engine components must be designed to work with each other. From there, spot on fuel and ignition tuning.... and this is just the engine. The chassis, suspension, tire selection, gear selection, clutch setup, ect must all be selected to compliment the motor's power AND your riding style. Each of those areas can be tuned as well. But the most important piece of advice I have to stress is USE QUALITY PARTS and take your time building everything right.... double checking all tolorances and measurements. The only way to win a race is to make it down the track! Fixing your machine all the time is embarassing, costs you races, gets expensive, is time consuming, and the end result is usually a bad attitude. Good luck with the research and poke around. If you're only interested in stock cylinders for the "stock appearance" try searching the "Wampus" line of aftermarket cylinders from CP industries. It is very similar to cub cylinder specs with the outer appearance of stock cylinders. This is the best way i ever heard it put. Speed isnt only about motor. Its as much rider comfortability than anything. If its too much motor for you to handle, youll spend more time trying to fight it rather than dumping the clutch and going. This single post here would be well worth a long conversation and someone definitely should post ideas on comfortable setups for certain track conditions for people to reference and use. Racing isnt only about being the fastest......its about being the fastest knowing that your beating the fastest. Quote Link to comment Share on other sites More sharing options...
badbanshee509 Posted November 25, 2012 Author Report Share Posted November 25, 2012 that makes alot of since, i now hav a lightened frame and chromoly upper and lower a arms on my bike now, i need to get to the track and get use to riding on it. i also have a lockup and 1-5 override tranny, but i am hearing alot of things about using the override and how it can easly get fucked up just by letting the motor slow the bike down with the override transmission engauged. is this true? Quote Link to comment Share on other sites More sharing options...
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