sweetshee4312 Posted May 22, 2004 Report Share Posted May 22, 2004 hey guys im getting some porting done, im gettting an mx trail port from jim, and im woundering how much this is going to bring my jetting up, right now im running 270 mains, 27.5 pilots, middle needle clip, 1000 elev. 70-80 deg F. Quote Link to comment Share on other sites More sharing options...
sweetshee4312 Posted May 22, 2004 Author Report Share Posted May 22, 2004 oo sorry about the double post but my mods are just fatty pipes, and airbox lid has holes(i dunno wha stock looks like) and no snorkle, and uni air filter Quote Link to comment Share on other sites More sharing options...
sredish Posted May 22, 2004 Report Share Posted May 22, 2004 well, it all depends on how much porting, but easily 2 or 3 sizes, and often more than that, like maybe 5, because your flowing much more air in and out. Quote Link to comment Share on other sites More sharing options...
350duner Posted May 22, 2004 Report Share Posted May 22, 2004 There's not really any way to tell until you get it done. Just go up several sizes and start doing plug checks. Start rich and lean it out from there. Quote Link to comment Share on other sites More sharing options...
reded Posted May 22, 2004 Report Share Posted May 22, 2004 I also have a 12 port motor from Jim and am running stock carbs (they suck I know). I have 25 pilots, as the bike wouldn't idle with anything larger and it constantly wanted to load up and blubber when trying to putt around. The needle is a dynojet needle in the 3rd notch from the top. Mains are 370. My problem is that when in fifth or sixth just cruising along at say 1/3 throttle and nail the throttle, it takes forever for the motor to come on the pipe. I'm thinking that it is running too rich in the midrange and can't pull itself on the pipe. My reasoning for this is, it was worse when the clip was in second notch from bottom. I know, I know, raise the f#@&ing clip idiot! Heres the clincher though, my friend has the exact same port job with the exact same pipes,(FMF Fatties) andexact same gearing, he was so frustrated that he stuck his stock needles back in and its still too rich. So where o where do I go from here? It runs fine when putting around in 1-3 and nail it, it will jump on the pipe rather quickly and is a load of fun. It runs like a scalded hog when its on the pipe and it will keep scalding him if you're raping it through the gears, its just that the roll on power sucks balls. I was hoping not to resort to spending another $500-$600 on gdamn carbs already. Someone help. Quote Link to comment Share on other sites More sharing options...
jeepman380 Posted May 22, 2004 Report Share Posted May 22, 2004 Hey man, where do you live in atchison? I'm only like 30 minutes from you. I live out by the Sac & Fox Casino. Quote Link to comment Share on other sites More sharing options...
reded Posted May 22, 2004 Report Share Posted May 22, 2004 I live north of town. Are you going to the ABATE dirt drags in June? It's a good friggin time, not to mention it's about a 5 min ride from my house. Quote Link to comment Share on other sites More sharing options...
sweetshee4312 Posted May 24, 2004 Author Report Share Posted May 24, 2004 um, not tobe an asshole, but does ne one have ne info on my jetting Quote Link to comment Share on other sites More sharing options...
sredish Posted May 24, 2004 Report Share Posted May 24, 2004 well, it all depends on how much porting, but easily 2 or 3 sizes, and often more than that, like maybe 5, because your flowing much more air in and out. Best thing to do is throw in mains that are a couple sizes bigger and run a plug check. There is no way any of us are going to be able to tell you what to use. Not only are all shee's a little different, but porting amounts are different, flow air different, and there are so many variables that it's impossible. You are going to have to run a plug check and perform a little trial & error to get it right. Quote Link to comment Share on other sites More sharing options...
TheBansheeMan86 Posted May 25, 2004 Report Share Posted May 25, 2004 yeah, just start high, and go from there. also i have a Q, right now im running 360 mains @ sealevel, needle in 3rd or 4th position (i forget, 4th i think), i have t5s, milled head, carbon techs on ported cages, 1/2" reed spacers, k&n clamp ons, boost bottle (some say doesnt work, but i took it off and noticed a loss in bottom end, so im leavin it on) and lightly polished ports. i want to get a stage 4 port job, but am curious, where do u find 400+ main jets??? cause if im 360 now, then i just might be 390-400 right? just curious cause i've never seen anything higher than 390.. Quote Link to comment Share on other sites More sharing options...
Justintoxicated Posted May 25, 2004 Report Share Posted May 25, 2004 (edited) I have Jim's 12 port also and i'm running a 32.5 pilot and I can idle All day and all night...So long as the choke is not pulled...now if only I could get the bike to run at WOT I would feel young again I have tried 340-380 mains and toomy needles in various positions with no luck (exact same problem)...but I can idle all damn day with 32.5s I think you need larger Pilots...Of course I went the new carb-air filter-intake-reed route can'twait to see if I can finaly go WOT again... Edited May 25, 2004 by Justintoxicated Quote Link to comment Share on other sites More sharing options...
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