i have a 05 883 that when warmed up loses fire or something it spits and sputters and back fires when throttling up will not accelerate bike only has 4000 miles on it it finally just died on a road trip an old biker stopped to help he traced the wires to a magnet device on the crank case he mashed on it the bike started running again but now it does the same thing cold or warm help please


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