Question about Harley Davidson FXDWG Dyna Wide Glide Motorcycles

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My buddies 1999 Twin Cam Dyna Wide first heard a noise coming from the engine. Rode fora couple miles. Noise got louder and also a "sucking" sound . Bike would not idle. He could still start it but would die at idle. No leaks from heads.......Spark Plugs look fine...............????

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Well, it's tough to try to diagnose a problem on a computer since I can't hear the noise for myself but here's a best guess.

You siad it made a sucking noise and it won't idle. I'd suspect a vacuum leak somewhere. Pull the air filter cover and the air filter. Check to make sure everything is tight in that area. Remove the air filter backing plate and check to see if the carburetor is tight. Remember, the stock CV carb is a spigot mount and it just pushes into the intake manifold. There is a seal around the intake and this seal could be bad or the gaskets where the intake connects to the head could be bad. If you remove the intake, make sure you get the alignment correct before you tighten the bolts that hold it to the head.

On either the intake or the backside of the carb, there is a vacuum port that supplies vacuum to the VOES switch and the vacuum operated petcock. Check this hose along it's entire length.

Well, Joe, that's my "best guess". I hope it helps.

Good Luck

Posted on Sep 14, 2010


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