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Showing results for tags 'idling'.
Found 2 results
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I have a 2004 Yamaha WR250F that the previous owner modified and the bike doesn’t run the way it should. It has an FMF muffler with an aftermarket pipe coming from the engine. There’s no other silencers or restrictions in the exhaust. When I got the bike, it was backfiring every time I let off the throttle no matter what speed I was doing. When the previous owner first started the bike, part of the exhaust pipe was cherry red while he was warming it up by giving it more throttle. I took the carburetor apart and found out that I have a 178 main jet, 40 pilot jet, and 72 leak jet. The needle clip was in the middle in the 4th position. I adjusted the fuel screw back to the 1.5 turns out position from the 3.5 turns out position the previous owner had it set at. I changed out the pilot jet to a 45 and the bike no longer backfires while I ride it but it does die when I leave it to idle. Sometimes it dies immediately after letting off the throttle and other times it will idle for a minute or two before dying. Now before this gets too confusing, I ran the bike with the fuel screw at 1.5 turns out and 3.5 turns out after changing the pilot jet. At 1.5 turns out, the bike would only run when choked and would die when idling. At 3.5 turns out, the bike will run with the choke off but will still die when idling. If anyone has any suggestions to try, please let me know.
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I recently purchased a 2009 Kx250f as the title says it was freshly rebuilt according to the previous owner I have receipts as well. The bike was running when I bought it the only issue it seemed to have was a slight hanging idle and backfiring. I’m assuming it is running lean last night I pulled the carb and cleaned it and the jets I have a 182 main and 40 pilot. I pulled the spark plug which was wet and gray I’m assuming I flooded it out while trying to adjust the fuel screw. Anyways i have a jet kit on the way but I’m wondering if switching to a 42 pilot would help this issue I’m not sure if my jets are clogged or if maybe it’s a cam or valve issue and help would be greatly appreciated I’m dying to ride while summer is still around.
