slag_350300 Posted August 22, 2011 Report Share Posted August 22, 2011 Im curious to know which pilot jets you fellas are using for riding at sea level my setup is keihin 34mm PJ carbs. I have 162 main jets, 52 pilot, 1 1/2 turns out on air screw, and the clips in the middle groove. I have fresh pistons in 65mm dune ported cylinders, 4 mil 110 rod crank, custom cut domes from M&M for 93 octane, +4 timing advance, new driveline performance heavy duty clutch, new boyesen reeds, new pro circuit exhaust. Ive leaned the main jets out so far, the pilot jets that were originally in it were size 58. I cant seem to get the bike dialed in right. It doesnt seem to pull very hard. I was half expecting a duneport and 4 mil crank to outperform my old setup which was paul turner national ported cylinders, 64.5mm bore, paul turner midrange pipes, stock stroke, 20cc domes. With that setup I had it richer on the mains and pilots and that thing ripped. Alot harder than the setup Im working with now so I need to work on jetting. Ive leaned the mains out a size, leaned the pilots out. And before I go anymore I wanted to see what you guys recommend. Im not sure which needles I have in there now but I did buy a pair of CEL needles with the intentions of trying them out. Thanks Quote Link to comment Share on other sites More sharing options...
LS3 Machine Posted August 22, 2011 Report Share Posted August 22, 2011 Im curious to know which pilot jets you fellas are using for riding at sea level my setup is keihin 34mm PJ carbs. I have 162 main jets, 52 pilot, 1 1/2 turns out on air screw, and the clips in the middle groove. I have fresh pistons in 65mm dune ported cylinders, 4 mil 110 rod crank, custom cut domes from M&M for 93 octane, +4 timing advance, new driveline performance heavy duty clutch, new boyesen reeds, new pro circuit exhaust. Ive leaned the main jets out so far, the pilot jets that were originally in it were size 58. I cant seem to get the bike dialed in right. It doesnt seem to pull very hard. I was half expecting a duneport and 4 mil crank to outperform my old setup which was paul turner national ported cylinders, 64.5mm bore, paul turner midrange pipes, stock stroke, 20cc domes. With that setup I had it richer on the mains and pilots and that thing ripped. Alot harder than the setup Im working with now so I need to work on jetting. Ive leaned the mains out a size, leaned the pilots out. And before I go anymore I wanted to see what you guys recommend. Im not sure which needles I have in there now but I did buy a pair of CEL needles with the intentions of trying them out. Thanks Did your old setup pull cleanly at all rpms? What alt and temp are u at? Do you have any mid range stumble when going from low rpm to high rpm? I had that problem and ended up dropping the needle (leaner) 2 clicks. Are u going to be using the new needles? Put the new needles in mid clip and do some testing. Why would you need custom domes for 93? The off the shelf 20 or 21s should be fine? Maybe u were too rich on the old setup? I've learned that carb tuning is easy, but it takes some time and experimenting. When I was first learning, I got some help from guys in the about box. Quote Link to comment Share on other sites More sharing options...
slag_350300 Posted August 22, 2011 Author Report Share Posted August 22, 2011 I have custom domes for a 4 mil crank with no spacer plate and i mix 83 octane with 100LL av gas which makes it in between. My old setup seemed like it pulled good every direction. Ive raised and lowered the needle position numerous times with no improvement. I did notice the clips looked worn out and the cheap-o needle retainer in those pj carbs didnt look like it was a tight fit, sloppy movement Ive been kicking the idea around on buying 35 PWK carbs for it cause Ive read on here that theyre much easier to tune. Im at sea level and 55-60 degrees. Ive gone with different compression, different stroke, different exhaust, and different port work so I figured the jetting would need some attention. and it appears to be off from my last setup. Quote Link to comment Share on other sites More sharing options...
boise_banshee Posted August 26, 2011 Report Share Posted August 26, 2011 Air Leak?? Quote Link to comment Share on other sites More sharing options...
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