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Tim-ANC

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Posts posted by Tim-ANC

  1. You have a vacuum operated fuel valve. The diaphragm opens up the fuel valve when it gets suck from the carb. No suck: it stops fuel delivery. Its meant to be automatic shutoff when the machine is not running. The spring operates a poppet shutoff valve. Removing the spring doesnt close the poppet allowing fuel to flow. The PRI position actually bypasses all this and feeds fuel directly.

    Your problem might be not getting suck from the carb or the poppet is stuck closed.

    I dont like these because the diaphragm can leak and you end up sucking fuel into the carb causing an overly rich condition. Ive replaced those on my machines with a standard ON OFF RES valves.

    Ive never seen a rebuild kit for them. You can look around. Otherwise get the standard valve, or put it together again and make sure the poppet works right. Also you can just run it in PRI, always on position.

  2. Are you the original owner? Just wondering if a different model carb found its way in there. There are different jet components for these Mikuni carbs depending on ATV model. You could try raising the needle jet to enrich the mixture.

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