cdwood37 Posted May 15, 2006 Report Share Posted May 15, 2006 I have a 4mm cub with 35mm airstrykers and shearer pipes with vforce2 reeds what should my jetting be? right now its a 160 main and a 78 pilot thats how i got the carbs i am at 5500 feet so any info would be nice. Quote Link to comment Share on other sites More sharing options...
blueshee03 Posted May 15, 2006 Report Share Posted May 15, 2006 my oppinion at your altitude i'd start with 55 pilots and 158 mains with clip on needle in middle position airscrew 1 1/2 turns out.just be sure to do a plug check before you ride it much.we're at 3000 ft and i think this should put you close.as you go up in altitude you normally need to go down a bit on your jetting. Quote Link to comment Share on other sites More sharing options...
wesw Posted May 15, 2006 Report Share Posted May 15, 2006 your beyond rich what needle you have. im at a 1000ft with a 150 main. Quote Link to comment Share on other sites More sharing options...
cdwood37 Posted May 15, 2006 Author Report Share Posted May 15, 2006 i don't know what needle it is i got it from Jeff at FAST just like it is but i know it is 160 mains and 78 pilots does it say somewhere on the needle what they are? Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted May 15, 2006 Report Share Posted May 15, 2006 I'm running 45 pilots and 145 mains at 4000 feet and I'm still alittle rich.I would try 140 mains with 45 pilots and middle clip on your needle. Quote Link to comment Share on other sites More sharing options...
FASTOYS Posted May 18, 2006 Report Share Posted May 18, 2006 Shouldnt be 78 pilots ! Give me a call and i will get you fixed up. Quote Link to comment Share on other sites More sharing options...
cdwood37 Posted May 18, 2006 Author Report Share Posted May 18, 2006 i just took it apart and it was 78 pilots Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted May 19, 2006 Report Share Posted May 19, 2006 im thinkin more like a 42 pilot and 155 main, give or take a few. for your altitude tho 78 pilot is way high... Quote Link to comment Share on other sites More sharing options...
cdwood37 Posted May 19, 2006 Author Report Share Posted May 19, 2006 From what i have read a 150 main is probably gonna be it and like everyone said a 50 or so pilot i am gonna work my way down from 155. Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted May 22, 2006 Report Share Posted May 22, 2006 Well I guess it is back to the drawing board for me, but can someone explain something to me? When the motor (er, ah engine) is openened up with say a 4 mil cub and v-force reeds, 35 carbs, and pods, why does the jetting go down? Unless I got that backwards but the lower numbers mean smaller jets right? If so, you are pushin' more air through the motor then don't you have to run more fuel through as well. I mean I hear people runnin' 320 and 340 mains on a ported motor with pipes and all the goodies........... I may be way off base here, but can someone clear this up for me. Thanks for the info...... Quote Link to comment Share on other sites More sharing options...
bigboybanshee Posted May 22, 2006 Report Share Posted May 22, 2006 Well I guess it is back to the drawing board for me, but can someone explain something to me? Quote Link to comment Share on other sites More sharing options...
wesw Posted May 22, 2006 Report Share Posted May 22, 2006 Well I guess it is back to the drawing board for me, but can someone explain something to me? When the motor (er, ah engine) is openened up with say a 4 mil cub and v-force reeds, 35 carbs, and pods, why does the jetting go down? Unless I got that backwards but the lower numbers mean smaller jets right? If so, you are pushin' more air through the motor then don't you have to run more fuel through as well. I mean I hear people runnin' 320 and 340 mains on a ported motor with pipes and all the goodies........... I may be way off base here, but can someone clear this up for me. Thanks for the info...... 519161[/snapback] for what ever reason cubs dont like fuel down low and in the mid as much compared to stock jugs. dont know if its the extra transfer ports or what. was told the cubs could be more efficient. they do like bigger mains. thats not saying throw a big main and its going to run. 340/320 are mukuni carbs, 140-155 are keikins(spelling) Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted May 23, 2006 Report Share Posted May 23, 2006 Well that makes more sense, didn't think about different manufacturer's (daaah). I also didn't think about the different configuration either. Thanks guys for clearing that up........... Quote Link to comment Share on other sites More sharing options...
cdwood37 Posted May 24, 2006 Author Report Share Posted May 24, 2006 I put a 152 main and a 48 pilot to start and it ran a lot botter all the way through and by the way I am sorry for saying it was a 78 pilot it was a 58. Whats the best way to check if I am to rich on the main. Do i run it wide open then shut it down real fast and check the plugs or what? Quote Link to comment Share on other sites More sharing options...
wesw Posted May 24, 2006 Report Share Posted May 24, 2006 hmm its called a plug chop put it in 5th gear hold it wot, then pull the clutch adn kill it, try to stop as quick as possible, if you dont have a pancake bearing it could weld your rod and ball. let it cool for a bit. remove a plug and look it over. white = lean black = rich tan/brownish close. Quote Link to comment Share on other sites More sharing options...
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