g-force Posted January 21, 2005 Report Posted January 21, 2005 im having some trouble getting my jetting right, i removed my air box and im using k n pod filters. ive went up several jet sizes from 300 to 370 and it still seems a little lean.1/4 to 1/2 throttle is getting a little rich. my question is do 400 main jets seem too big? needle is on 3rd position i was going to move it to 2nd from blunt end. does 400 seem to big for stock carbs? motor is ported with coolhead 18 domes 170 lbs compression t-5's i only ride at glamis elevatin 300ft Quote
NMBANSHEE Posted January 21, 2005 Report Posted January 21, 2005 When I switched to pod filters I went up 5 jet sizes. 400's might not be to rich. Do a 6th gear plug chop on a warm engine and new plugs, look for a 2mm choclate brown ring around the bottom of the ceramic insulator. As for needles I would wait until you get the main dial in first. Sounds like it might be time to start saving for bigger carbs Good Luck Quote
Banchetta Posted January 22, 2005 Report Posted January 22, 2005 Your mains mostly control wide open throttle. If you want to richen 1/4-3/4 throttle, then raise the needles to the 4th clip from the blunt end... Quote
g-force Posted January 23, 2005 Author Report Posted January 23, 2005 Your mains mostly control wide open throttle. If you want to richen 1/4-3/4 throttle, then raise the needles to the 4th clip from the blunt end... 310199[/snapback] i changed to a 400 main jet and did a WOT plug check,revs good and plugs are a light brown, maybe still alittle lean? but in the middle it seems too rich, hesitation and sputtering and then when it finally hits it revs good! do i need to lower the needle to 2nd clip? thanks for your help! Quote
bogart Posted January 24, 2005 Report Posted January 24, 2005 i changed to a 400 main jet and did a WOT plug check,revs good and plugs are a light brown, maybe still alittle lean? but in the middle it seems too rich, hesitation and sputtering and then when it finally hits it revs good! do i need to lower the needle to 2nd clip? thanks for your help! 310724[/snapback] lean Quote
FIRST BANSHEE Posted January 24, 2005 Report Posted January 24, 2005 i changed to a 400 main jet and did a WOT plug check,revs good and plugs are a light brown, maybe still alittle lean? but in the middle it seems too rich, hesitation and sputtering and then when it finally hits it revs good! do i need to lower the needle to 2nd clip? thanks for your help! 310724[/snapback] what size pilots do you have? yes if your fat in the middle you can raise your clip. Quote
Banchetta Posted January 26, 2005 Report Posted January 26, 2005 Hesitation is caused by a lean pilot or needle. Spitting and sputtering like the choke is on is a rich condition...Raise the needle for richening and lower the needle for leaner... 1st clip toward blunt end = lean 5th clip toward point end = rich.. Quote
g-force Posted February 9, 2005 Author Report Posted February 9, 2005 Hesitation is caused by a lean pilot or needle. Spitting and sputtering like the choke is on is a rich condition...Raise the needle for richening and lower the needle for leaner...1st clip toward blunt end = lean 5th clip toward point end = rich.. 312310[/snapback] i finally got a chance to do a plug chop,there was a 2mm light brown ring,not chocolate,is that right? i also lowered the needle to 2nd clip from blunt end. that helped the middle throttle a lot! but still some sputtering. should i lower needle to 1st clip? or buy new longer needle? thanks for help! Quote
bigboybanshee Posted February 9, 2005 Report Posted February 9, 2005 This may be a shot in the dark but have you checked for any air leaks? Only reason I'm thinking this is because you've gone up from a 300 main to a 400 and only noticed a little difference in coloration. I can change jets from a 280 to 290 and see a difference on my plugs Quote
g-force Posted February 9, 2005 Author Report Posted February 9, 2005 This may be a shot in the dark but have you checked for any air leaks? Only reason I'm thinking this is because you've gone up from a 300 main to a 400 and only noticed a little difference in coloration. I can change jets from a 280 to 290 and see a difference on my plugs 320378[/snapback] i thought the same thing, i checked for air leaks, sprayed wd40 while idleing couldn't find any leaks.i never did a plug chop before i installed the new air filters! but i expect it must of been on the lean side. Quote
Banchetta Posted February 10, 2005 Report Posted February 10, 2005 I'd try the 1st clip, no doubt, you might be able to gain just as much as the first time... ARe you running stock pilots or larger??? Quote
g-force Posted February 10, 2005 Author Report Posted February 10, 2005 I'd try the 1st clip, no doubt, you might be able to gain just as much as the first time... ARe you running stock pilots or larger??? 320511[/snapback] i havn't checked what size pilots i have, but the bike starts and idles fine. Quote
bigboybanshee Posted February 10, 2005 Report Posted February 10, 2005 I think if you can't get what you're looking for out of adjusting the needle to the first clip, you might want to think about bigger carbs. I'll bet your porting is really liking that air you're feeding it now, those stock carbs may not be enough to get the engine the right amount of gas. Quote
richybanshee Posted February 11, 2005 Report Posted February 11, 2005 Maybe you need a longer thinner jet needle, so that you can dial the mid range better. I used Alba needles and they work. Like I said: the needle is longer, thinner and with more notches (6). Stock needle is shorter and thicker with 5 notches. Quote
SANDSTAR Posted February 11, 2005 Report Posted February 11, 2005 R u fouling plugs when you putt around? Quote
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