notsed Posted August 29, 2012 Report Share Posted August 29, 2012 i have a 421 serval at 600"asl, +2 timing, not sure on the domes but running 94 pump with stock carbs with 27.5, 1 out, 360 main and toomey needle, pods in 80-90* 155psi. that was the set up for the t5s i had on it. it was a couple mains rich but ran strong. now i have some bb inframe shearers (supposed to be sb but i got screwed) that i need to get jetted close before i take it out because i dont have the room to plug chop at home and i need to ride it to a plce i can. so what do you guys think it should have? Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted August 29, 2012 Report Share Posted August 29, 2012 You definitely need a small bore pipe. I am sure you can find someone to swap you. Quote Link to comment Share on other sites More sharing options...
lms1977 Posted August 29, 2012 Report Share Posted August 29, 2012 Yea I would say the big bores will never run right.. But I could Be wrong. Quote Link to comment Share on other sites More sharing options...
Dicklez Posted August 29, 2012 Report Share Posted August 29, 2012 Are they new? Chrome, Black? Quote Link to comment Share on other sites More sharing options...
notsed Posted August 29, 2012 Author Report Share Posted August 29, 2012 i realize it should have sb and cpi would probably be better but i didnt mention i was told they were sb from the guy i got them from but he lied. so ths is what i have to work with for now, actually i took it for a quick rip the way its jetted and it has more low end then it did with the t5 it just takes a little longer to hit the power then it revs forever it seems but doesnt feel as strong up top, could be jetting tho i can only get 1/2 way thru 3rd around my place. thanks again for any advice someone might have. Quote Link to comment Share on other sites More sharing options...
notsed Posted August 29, 2012 Author Report Share Posted August 29, 2012 there probably a year or more old, chrome with bare aluminum silencers, in decent shape and they should clean up nice Quote Link to comment Share on other sites More sharing options...
Dicklez Posted August 29, 2012 Report Share Posted August 29, 2012 there probably a year or more old, chrome with bare aluminum silencers, in decent shape and they should clean up nice Are you sure they are BB pipes? Plus on the smerval, I dont think CPI would be better. There is a few threads with people arguing about which is. Shearer4LIfe Quote Link to comment Share on other sites More sharing options...
notsed Posted August 29, 2012 Author Report Share Posted August 29, 2012 im positive there big bore. you can tell by the size and shape of the pipe by the cylinder just by looking at it, also the stnger tubes are bigger. look at the 4th post down to see what i mean http://bansheehq.com/forums/index.php?showtopic=120868 Quote Link to comment Share on other sites More sharing options...
Nightmare Posted August 29, 2012 Report Share Posted August 29, 2012 10mil or bigger for bb Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 30, 2012 Report Share Posted August 30, 2012 i run sb on my 421 cub and love them, i'd like to hear what the bb would sound like on it Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted August 30, 2012 Report Share Posted August 30, 2012 It would sound like a motor with the wrong pipes on it. Quote Link to comment Share on other sites More sharing options...
guns4children Posted August 30, 2012 Report Share Posted August 30, 2012 Are you sure they are BB pipes? Plus on the smerval, I dont think CPI would be better. There is a few threads with people arguing about which is. Shearer4LIfe Didn't know shearer made a 300ex pipe... Quote Link to comment Share on other sites More sharing options...
notsed Posted August 30, 2012 Author Report Share Posted August 30, 2012 why is everyone telling me i have the wrong pipes? i know that already, like i said i got the wrong ones. the question was what jetting i should run, i can see how it would be a hard one to answer since theres not really anyone running what i am. that being said would a bb pipe require more or less fuel compared to a sb? im assuming it would need more fuel but im not sure, thats why i asked. to everyone saying it wont run right, what do you mean? wont be full potential or what? it runs ok now with the jetting it has, doesnt feel much different form the t5s beside top end, its a lil choppy at 1/2 throttle but thats about it, maybe lean on the main too gotta check. Quote Link to comment Share on other sites More sharing options...
notsed Posted August 30, 2012 Author Report Share Posted August 30, 2012 i run sb on my 421 cub and love them, i'd like to hear what the bb would sound like on it cant compare the sound to the sb ones but mine sound real quiet when its idling and gets real fucking loud when it revs really tho compered to the t5's thats my best description of how they sound, way less pinging too Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted August 30, 2012 Report Share Posted August 30, 2012 why is everyone telling me i have the wrong pipes? i know that already, like i said i got the wrong ones. the question was what jetting i should run, i can see how it would be a hard one to answer since theres not really anyone running what i am. that being said would a bb pipe require more or less fuel compared to a sb? im assuming it would need more fuel but im not sure, thats why i asked. to everyone saying it wont run right, what do you mean? wont be full potential or what? it runs ok now with the jetting it has, doesnt feel much different form the t5s beside top end, its a lil choppy at 1/2 throttle but thats about it, maybe lean on the main too gotta check. Well the answer is it won't run to it's full potential. (The oversized pipes will hurt performance. But still might be better than the T-5's) As for jetting....it'll be hard for anyone to give you an answer that you can go with because your running a pipe that is too big for what the motor is. Your sort of on your own on that one. Assuming you'll need more fuel just because the pipes are big would be a guess. The oversized pipes will actually make the pipe scavenge less and the pipe won't be tuned to maximize it's effects on the combustion process. So not only will your power be down, but tuning the motor will be harder. The leap that I would suggest you make, is to make a plan to sell those pipes and get some SB's....then get it jetted right. But I understand......you just want to ride. Wish I could help you more, but other than to tell you to do plug chops and start out rich and work your way lean.......you'll have to find the right jets through trial and error. Quote Link to comment Share on other sites More sharing options...
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