bansheeboie Posted January 27, 2012 Report Posted January 27, 2012 hey fellas im in process of doing a 4mil 421 stroker dune/play port on my bike. i have a pro design head and wil b running 21 or 20cc domes, on pump gas. im at sea level and the temp is between 30 and 45 degrees. i have 35mm keihin carbs and will b using small bore cpi inframes. Quote
vulvafan537240 Posted January 27, 2012 Report Posted January 27, 2012 Is this a big bore sleeved stocker, cub or serval and what pipes? Quote
BUILDER Posted January 27, 2012 Report Posted January 27, 2012 You should be right around a 155 to 160 main jet and a 52 to a 55 pilot Quote
camatv Posted January 28, 2012 Report Posted January 28, 2012 dang thats a big ass pilot. drop those jets in and start form there any other concerns and PLEASE read the entire jetting FAQ's thread and see if any of that helps Quote
werner Posted January 28, 2012 Report Posted January 28, 2012 You should be right around a 155 to 160 main jet and a 52 to a 55 pilot 421 ported cub. 35 pwk. Vf2. Cpi inframes. I just finished my tuning today and I ended with 48 pilot and 155 mains. Still slightly rich. Currently running dek needle (rich) on top clip but i will move to cel (leaner). Redline will be dyno tuning soon so we will see How close I came. Quote
bansheeboie Posted January 28, 2012 Author Report Posted January 28, 2012 ok thanks fellas il get back to u as soon as i get my parts back from hjr and finish my build Quote
sleeper06 Posted January 31, 2012 Report Posted January 31, 2012 at our side of the country sea level,165 main 50 pilot,cel 4th clip Quote
Wildcardracing Posted January 31, 2012 Report Posted January 31, 2012 You're really going to want to consider a larger cc dome if you plan on the engine surviving on pump gas....somewhere around 24cc depending on porting and cylinder type Quote
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