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General Minitrail Talk
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S65 carb woes
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<blockquote data-quote="Sams65" data-source="post: 187448" data-attributes="member: 12820"><p>An update to this saga - and a bump to this post - have tried 3 different stock carbs now with 3 different sets of needles and jets and all behave in exactly the same way:</p><ul> <li data-xf-list-type="ul">Bike starts fine but idles and runs very, very rich (no choke needed)</li> <li data-xf-list-type="ul">Plugs not just carbon fouled - they're dripping with wet, unburned gasoline<br /> </li> <li data-xf-list-type="ul">Bike moves under its own power, but loses power in higher RPMs (power just ends up flat-lining)</li> <li data-xf-list-type="ul">All carbs and parts are stock & set to stock settings by the book<br /> </li> <li data-xf-list-type="ul">Leak down test gives a perfect score with only about 2% leakage<br /> </li> <li data-xf-list-type="ul">Timing is correct (confirmed with timing light)</li> <li data-xf-list-type="ul">Cam sprocket is correctly installed (with marks aligned)</li> <li data-xf-list-type="ul">Spark appears fat and blue when grounded to engine</li> <li data-xf-list-type="ul">Valve clearances check out</li> <li data-xf-list-type="ul">Brand new (stock) air filter.</li> </ul><p>Any and all suggestions are welcome, no matter how crazy. With the same issue appearing over 3 different carbs, I had given up on bad mixture being the culprit and tried to look elsewhere. But where? With a passing grade on all the above tests I'm ready to suspect the supernatural... Somehow, from somewhere, the bike guzzles gas. Even after setting the float as low as it could possibly be set without starving out completely.</p></blockquote><p></p>
[QUOTE="Sams65, post: 187448, member: 12820"] An update to this saga - and a bump to this post - have tried 3 different stock carbs now with 3 different sets of needles and jets and all behave in exactly the same way: [LIST] [*]Bike starts fine but idles and runs very, very rich (no choke needed) [*]Plugs not just carbon fouled - they're dripping with wet, unburned gasoline [*]Bike moves under its own power, but loses power in higher RPMs (power just ends up flat-lining) [*]All carbs and parts are stock & set to stock settings by the book [*]Leak down test gives a perfect score with only about 2% leakage [*]Timing is correct (confirmed with timing light) [*]Cam sprocket is correctly installed (with marks aligned) [*]Spark appears fat and blue when grounded to engine [*]Valve clearances check out [*]Brand new (stock) air filter. [/LIST] Any and all suggestions are welcome, no matter how crazy. With the same issue appearing over 3 different carbs, I had given up on bad mixture being the culprit and tried to look elsewhere. But where? With a passing grade on all the above tests I'm ready to suspect the supernatural... Somehow, from somewhere, the bike guzzles gas. Even after setting the float as low as it could possibly be set without starving out completely. [/QUOTE]
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