banshenstein Posted October 13, 2009 Report Share Posted October 13, 2009 I AM BUIDLING +4 MIL. STROKED CUB BLOCK W/ 68 MM PISTONS. +4 MIL. CRANK. I AM GOING TO BE RUNNING SHEARER IN-FRAME EXHAUST, DOMED COOL HEADS. WHAT SIZE CARB, DO I NEED TO RUN AND WHAT JETTING TO MAKE IT RUN CORRECT AND ABLE TO MAKE ADJUSTMENTS? Quote Link to comment Share on other sites More sharing options...
popa_top2000 Posted October 14, 2009 Report Share Posted October 14, 2009 Im building a 421 cub for 1/8 mile and I'm running 39's. Your jetting depends on several different factors. I would call someone like Jeff from F.A.S.T and tell him exactly what you're building and what you're using it for, he can get you the right size carbs and set up jetting so you will be close. Then you can just tune from there. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted October 14, 2009 Report Share Posted October 14, 2009 And jeff at fast has the best prices on keihin pwk's. Quote Link to comment Share on other sites More sharing options...
banshenstein Posted October 14, 2009 Author Report Share Posted October 14, 2009 does this jeff @ f.a.s.t. have a site? Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted October 14, 2009 Report Share Posted October 14, 2009 (edited) Fast Racing site http://www.farmandsandtoys.com/ Edited October 14, 2009 by fastbanshee8 Quote Link to comment Share on other sites More sharing options...
SAVAGE420 Posted October 14, 2009 Report Share Posted October 14, 2009 As said above Jeff's got good deals Plus he is a sponsor here also. Quote Link to comment Share on other sites More sharing options...
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