Okay well I have a 1986 yamaha moto 4 250cc. It runs great but it will not idle long at all. It will idle for about 5 seconds and then it will go dead. I have tried to find out how to make it idle on the Internet but I can't. Any help would be appreciated. Thanks. And please be detailed with your answers.Yamaha atv question. ?
sounds like you got something obstructing the idle circuit of carb. remove carb, dissassemble %26amp; clean idle circuit with a very fine piece of wire ( twisttie) or 1 strand of copper fron a piece of auto wire. on the airfilter end of the carb there will be 2 ports before venturi ,1 is larger %26amp; goes to choke circuit, the other is smaller %26amp; bleeds air to idle mixture screw %26amp; upper portion of main jet. be careful not to damage port with a wire that is too thick. I have had this proplem before. it only takes a very small grain of sand or dirt to block the idle mixture port. after reassembly set idle mixture screw at 1.5 turns open, start engine %26amp; fine adjust for smoothest idle that doesn't bog when throttle is opened. check your air filter to ensure it is clean %26amp; sealing correctly to airbox
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