STLbanshee Posted February 2, 2004 Report Share Posted February 2, 2004 I got sst's and a k&n with no air box lid, and running a 280 main with stock pilot jets but I noticed that the pipes got real blue, goldish color even, right out of the head, and my plugs are a light brown, but sometimes are real dark, and now, I had the idle all set correct, and now after I have rode it a few times, and like when you pull the clutch in to come to a stop, it like idles higher, then then will start to idle down after like 10 seconds..any help, do you think I should step up to a 300 or 310 main jet? Quote Link to comment Share on other sites More sharing options...
Ducman Posted February 2, 2004 Report Share Posted February 2, 2004 I think you are way to lean . You are jetted at about what you should be at if you still had the air box lid on. The pipes will aventually blue over time but shouldn't blue that fast. That is a sign of hotter than normal exhaust gas temps. I think you are lean on the pilot jet as well which is why it wants to idle soo high. How far out do you have the air screws? If they are more than 2.5 turns out then try going up a size or 2 on the pilots. You sould be using at leat a 310 main. 310 could even be lean if you are at sea level with cold ambient air temps. I am not as experienced as many others in this forum at jetting but on my shee with the air box lid off and with a foam air filter which flows no beter than a stock filter I am at a #30 pilot and 280 mains on my FMF Gnarleys. The extra flow from the K&N's alone will increse your main jets size by around 4 sizes. You could also try putting your air box lid back on but i think you'd still be a litle lean. The plugs can be decieving unless you install new ones and to a wide open throttle run with them, and know how to read them. Read about the plug chop on the Banshee jetting FAQ http://www.dfn.com/benkaren/jetfaq.html Quote Link to comment Share on other sites More sharing options...
Ducman Posted February 2, 2004 Report Share Posted February 2, 2004 Also make sure the engine is good and warmed up before adjusting the idle. It will idle differently after the engine has be riden a couple of minutes from when it is cold or even if it has only been started and warmed up just sitting for 2 minutes. Quote Link to comment Share on other sites More sharing options...
STLbanshee Posted February 2, 2004 Author Report Share Posted February 2, 2004 well my stock size jets are only a 200, and I have the air screws out about a turn at most.. Quote Link to comment Share on other sites More sharing options...
Ducman Posted February 2, 2004 Report Share Posted February 2, 2004 well my stock size jets are only a 200, and I have the air screws out about a turn at most.. Stock pilots are a #25. The stock mains are #200. If your running lean at idle (on the pilots) then you need to turn the screw in further. If you turn the air screws to within 1/2 turn of being all the way in then you need to go up a size on the pilot. Some people seam to be able to get good tuneing on the the idle with stock mains so whatever you can get to work, do it. The important one to get correct is the mains so you dont burn up the pistons by running lean when your running at wide open throttle. Quote Link to comment Share on other sites More sharing options...
kenr74 Posted February 2, 2004 Report Share Posted February 2, 2004 I'd say you are lean too. I have Fatty's and dual K&N's. I have 30's in the pilot and 350's in the mains. Quote Link to comment Share on other sites More sharing options...
Banchetta Posted February 3, 2004 Report Share Posted February 3, 2004 You checked the plugs after running it wide open??? If not, then your getting false readings...normal riding won't tell your anything. You have to run it wide open in 6th gear for 5-10 seconds, shut it down, pull the plugs....anything else isn't right...If your getting light brown w/ normal riding, then I'd go up a couple of sizes before running it wide open....normal riding usually runs richer...the erractic idling is caused by either the wrong slides in the carbs (right and left swapped) or your jetting is way off from wide open throttle to idle circuit....start w/ the mains and go from there...then adjust the air screws to the highest idle or best throttle response... also make sure your carbs are in synced... Quote Link to comment Share on other sites More sharing options...
boonman Posted February 3, 2004 Report Share Posted February 3, 2004 do you think I should step up to a 300 or 310 main jet? Just to stick my $.02 in here. I run almost the exact same setup on my bike. Fatties, open lid. Stock porting. Now, I run 310 mains in the summer. I am on 27.5 pilots. but, I like a little leaner pilot. I have heard of people running a 30. I would get a 27.5 pilot, and some 310 and 300 mains. Start with the 310's, or even 320's and see what it does. What is your elevation. Mine is 800'. You are lean. If you don't change, sever engine damage will result... Quote Link to comment Share on other sites More sharing options...
sredish Posted February 3, 2004 Report Share Posted February 3, 2004 do you think I should step up to a 300 or 310 main jet? Just to stick my $.02 in here. I run almost the exact same setup on my bike. Fatties, open lid. Stock porting. Now, I run 310 mains in the summer. I am on 27.5 pilots. but, I like a little leaner pilot. I have heard of people running a 30. I would get a 27.5 pilot, and some 310 and 300 mains. Start with the 310's, or even 320's and see what it does. What is your elevation. Mine is 800'. You are lean. If you don't change, sever engine damage will result... With my fatties, open K&N, reeds I was at 310, 27.5 over the summer. Thats at 2,000'. Quote Link to comment Share on other sites More sharing options...
boonman Posted February 3, 2004 Report Share Posted February 3, 2004 open K&N There's why. I run a UNI filter in the airbox, just no lid. Open K&N ought to go up about 2 or so on the main..... Quote Link to comment Share on other sites More sharing options...
sredish Posted February 3, 2004 Report Share Posted February 3, 2004 When I changed to the single carb, I also switched to the Uni. I see more dirt on the uni, but I think it catches more. A friend doesn't like to use the uni because he has to clean it more often, and i think there's a reason. The only time I use the K&N is when I'm in sand. Quote Link to comment Share on other sites More sharing options...
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