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Loud Random Clunk on 04 Hawk

Old 12-30-2006, 02:33 PM
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Loud Random Clunk on 04 Hawk

Ive noticed a few times a loud clunk coming from what appears to be under my tank ...its a fast clunk that sounds like metal on metal. It happens randomly and today I noticed it when I gave a shot of gas....usually when the Hawk is cold......

Any Ideas Hawk gurus?
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Old 12-30-2006, 02:36 PM
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Like a backfire through the carbs?
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Old 12-30-2006, 02:44 PM
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Def not anything like that....hard to describe and too rare to capture on video....it sounds like there is a little midget somewhere under my tank that whacks something metal and hollow really hard with a giant screwdriver.....yeah a midget with a screwdriver!!
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Old 12-30-2006, 04:21 PM
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Do you have the rubber grommets that go in the rear tank mount?
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Old 12-30-2006, 08:53 PM
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Will have to check tomorrow...I know there are rubber grommets on the front of the tank......I will get back to ya...
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Old 12-31-2006, 07:30 AM
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like hawkriders said backfires. Make sure your carbs are fully seated and there are no vacuum leaks. It is common for the carbs to break free of the manifolds. Vacuum leak=lean condition which then causes backfires.
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Old 12-31-2006, 08:01 AM
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I have the same problem under heavy load....popping/thumping noise, sounds like metal on metal. I'm also thinking lean condition.
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Old 12-31-2006, 08:11 PM
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You aren't getting detonation under load are you? (Not sure what you call it in the US, but pinging or pinking and pre-ignition are other terms used.)
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Old 12-31-2006, 11:00 PM
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I checked the tanks mounts and I dont think thats it....im not a mechanic by any means but if it is a backfire in the carb is there a chance when the backfire occurs it slams shut a valve or flap that would make a clanking sound?

Thanks for the help great site by the way...
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Old 01-01-2007, 12:35 PM
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Most likely the clunk is the carb(s) lifting and slamming the airbox into the bottom of the tank. It only takes on good backfire to dislodge the carbs. Have you checked them yet? Even unseated they may, and usually do, appear to be seated. Pull the airbox, take a close look, and move them around a bit.
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Old 01-01-2007, 03:37 PM
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Cool....the Hawk is tucked away for a bit (its freakin cold)...but the first semi-warm day i'll drag it out and take a peek.
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