muggzy Posted September 24, 2011 Report Share Posted September 24, 2011 Hey guys, I finally upgraded to 28mm PWKs so I can get rid of the stock Mikunis so now I need a starting point for my jetting.. Can anyone ballpark my jetting on the PWK28's? I have NO mains or Pilots right now and the needles are N68A. All I can find on the carbs says that the 'A' on the needles means they are the richest needles if that's even accurate. Current jetting is in my sig. and I'm at 900ft. Quote Link to comment Share on other sites More sharing options...
LS3 Machine Posted September 24, 2011 Report Share Posted September 24, 2011 Hey guys, I finally upgraded to 28mm PWKs so I can get rid of the stock Mikunis so now I need a starting point for my jetting.. Can anyone ballpark my jetting on the PWK28's? I have NO mains or Pilots right now and the needles are N68A. All I can find on the carbs says that the 'A' on the needles means they are the richest needles if that's even accurate. Current jetting is in my sig. and I'm at 900ft. If I was you I would buy a 45, 48, 50 pilot, and start with the 48. For the main I would buy the 145, and 2 sizes higher (I think 148/150?), and start with the 148 or 150. There is a chance that you may need a bit higher, say 152ish. Needle mid clip. 1.5 turns out. Quote Link to comment Share on other sites More sharing options...
apeik Posted September 24, 2011 Report Share Posted September 24, 2011 runnin pwk 28's, ported with k&n pods, fmf's, 50 pilot, 158 main, n68a needle middle clip, 1.5 turns out, this is at sea level. GL Quote Link to comment Share on other sites More sharing options...
muggzy Posted September 25, 2011 Author Report Share Posted September 25, 2011 A big thanks to both of you Quote Link to comment Share on other sites More sharing options...
Zwiser Posted September 25, 2011 Report Share Posted September 25, 2011 I run a 145 main and a 45 pilot JJH needle on the third clip, with no porting, t4 pipes, KN filter no lid, at 400 ft Quote Link to comment Share on other sites More sharing options...
willardwright59 Posted February 3, 2012 Report Share Posted February 3, 2012 If I was you I would buy a 45, 48, 50 pilot, and start with the 48. For the main I would buy the 145, and 2 sizes higher (I think 148/150?), and start with the 148 or 150. There is a chance that you may need a bit higher, say 152ish. Needle mid clip. 1.5 turns out. to the top with this, i need some help too. im going to 28mm carbs from stock 26s. mods: pods, pc pipes, .020 over, trinity coolhead, 20cc domes, wiseco pistons, +4 timing, vf3 reeds, hinson dirt digger clutch, twist throttle. jetting currently in 340main, 35 pilot, air screw 2 turns out, clip is 2nd from bottom. help here guys? Quote Link to comment Share on other sites More sharing options...
Coupelx Posted February 3, 2012 Report Share Posted February 3, 2012 140/45 with r2's and porting. needs to drop another main size after more transfer work on the cylinders. Quote Link to comment Share on other sites More sharing options...
willardwright59 Posted February 3, 2012 Report Share Posted February 3, 2012 140/45 with r2's and porting. needs to drop another main size after more transfer work on the cylinders. So 150/40 for me? Quote Link to comment Share on other sites More sharing options...
Coupelx Posted February 3, 2012 Report Share Posted February 3, 2012 So 150/40 for me? only way to know is give it a whirl. Quote Link to comment Share on other sites More sharing options...
willardwright59 Posted February 4, 2012 Report Share Posted February 4, 2012 only way to know is give it a whirl. By going to bigger carbs, what am i changing? I mean now i have 350 mains and ill drop 200 to a 140? Quote Link to comment Share on other sites More sharing options...
Coupelx Posted February 4, 2012 Report Share Posted February 4, 2012 By going to bigger carbs, what am i changing? I mean now i have 350 mains and ill drop 200 to a 140? mikini jet sizing is different from keihin. the number for the keihin is the actual size of the hole in the jet while mikuni is based on the flow rate at a certain depression with a full moon on the longest day of the year or some shit. I also run jjh needles with my r2's but the n68a needles work great with the t5's Quote Link to comment Share on other sites More sharing options...
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