TeamRealtreeHD Posted July 10, 2008 Report Posted July 10, 2008 (edited) When you guys are running a tad lean, or rich... do you swap both the pilot and main or just the mains? How do you know when to switch out the pilots? I usually never switched them out before, just maybe once, so I don't know what to look for with these new duals once I get them on. If it is running lean, I can go up in the mains a little, but what about the pilots? When do I swap them out? And do I go the same way? I just put in 160 mains, and 52 pilots to start with my mods listed in my sig... Edited July 10, 2008 by TeamRealtreeHD Quote
BellicoseBanshee Posted July 10, 2008 Report Posted July 10, 2008 This is how to set the air screws: Turning the air screw clockwise reduces the amount of air and turning the air screw counter-clockwise increases the amount of air in the pilot system. Warm up your engine, then adjust the idle slightly higher than normal. Turn the airscrews in until they seat and then back them 1/4 turn and let the engine stabilize. Keep turning the airscrews out a 1/4 turn at a time, allowing the engine time to stabilize between changes, until the engine reaches its highest RPM. The air screws should be between 1 and 2-2.5 turns out. If the highest RPM is less than 1 turn (lean), install a larger pilot jet. If the highest RPM is more than 2-2.5 turns out (rich), install a smaller pilot. I always verify the main jets are still correct before working a jetting problem, even if it is a mid or bottom-end jetting issue (unless making minor adjustments). Once the main is correct, I adjust the needle. When the needle is correct, then I make a final adjustment on the iar screws and then set the idle. Changes in fuel/oil ratio: Whenever you decrease the amount of oil in the fuel/oil mixture, it increases the amount of fuel in the fuel/air mixture. A rich or lean jetting condition is not determined by the amount of oil mixed with the gas, but determined by the amount of fuel mixed with the air coming in. If the engine is jetted incorrectly, cutting the oil in the mixture may improve performance, but a bike canbe jetted to run well mixed at 50:1 or it can be jetted to run well mixed at 20:1. It is all in the jetting... I am not a jetting expert, and without actually riding the machine, I can only offer the techniques that I use when correcting a jetting issue. I would start with the mains, then go to the needle, then finalize the air screw. If the problem persists with reasonable changes in jetting, then I would look at something else. Keihin Jetting Tips Jetting FAQ Plug Chop Good Luck! :beer: Quote
TeamRealtreeHD Posted July 10, 2008 Author Report Posted July 10, 2008 That helped out ALOT... thanks my man! Quote
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