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Posted on Nov 02, 2010
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Will not idle. Will not start hot or cold without throttle 1/4 open. Once started will rev well but when revs drop it cannot be recovered and it just dies. Needs choke wether hot or cold to start and 1/4 throttle as a minimum. Air screw does raise slide slightly but makes no difference. Even air screw fully in or out it will die when throttle released. Mixture screw makes no noticable effect as the revs cannot be held constantly low without dying. Carb totally clean, new gasket on suction coupling, reeds in good shape. Fuel clean, new fuel pipe and filter clear. Compression good. Is there anything you can advise before I end up stripping down and looking at the crancase seals or perhaps new piston etc.

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  • Posted on Nov 02, 2010
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By your description, it sounds like the pilot jet is plugged in the carb. Remove carb and clean thoroghly with carb cleaner and air, making sure that all jet passages are clear. Make sure that washer and "o" ring are present on fuel mixture screw, if so equipped. Make sure float level is correct.

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