jeepman128 Posted July 29, 2006 Report Posted July 29, 2006 OK... so i just got done building my 421 cub which has cpi pipes and single 35pwk at 700ft elevation ... yes a single carb. :baseball_shocked: ..( yes i know it is starving it on the top end, but thats not where the problem is right now.. its on the bottom end) but i am having some trouble jetting it so it will idle and run good right off idle... i know this is related to the pilot jet which i have tried a 50 a 60 and a 58. but the darn thing will just not idle, or come off idle smoothly... everywhere else is perfect. I tried moving the clip around on the needle, and so far it runs best at the top notch (needle moved down) but i cant figure out for the life of me which way i need to go with the pilot. It just seems like it is bogging and gasping for either air or fuel..(it makes that hallow echoing sound before it cleans out) No matter where i put the mixture screw or the idle air screw.. it has little effect.. (meaning the pilot is not right... I think :ermm: ?????)but which way should i go? up or down? Thanks in advance for your help! Quote
locogato11283 Posted July 30, 2006 Report Posted July 30, 2006 in my 35mm dual pwk i ran a 45 pilot. drop it down and see what happens. Quote
jeepman380 Posted July 31, 2006 Report Posted July 31, 2006 Yeah try going down on the pilot some before you mess with the needle I would say. The needle shouldn't have much to do with idle. Quote
jeepman128 Posted July 31, 2006 Author Report Posted July 31, 2006 I went down to a 48, and it helped out a lot. It idles now and comes of idle much smoother. i still have some fine tuning to do with the carb but we are on the right track. Thanks for your help Quote
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