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sputtering around 4-5k rpm, any sugestions?

Old 09-17-2005, 07:43 PM
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Did it happen soon after refueling?
If you over fill them, the tank vent can fill with fuel and cause that.
Fix is open the fuel tank cap and break the tank vacuum.

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Old 09-18-2005, 12:55 AM
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Re: sputtering around 4-5k rpm, any sugestions?

either that or you are out of gas. remember they are gashogs. but even after the engine dies, you can get it going and baby it on fumes for about a mile. but its really bad for the fuel pump.
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Old 09-18-2005, 07:08 AM
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Re: sputtering around 4-5k rpm, any sugestions?

No fuel pump on a superhawk, gravity feed only; might be why they hydro-lock so easily.

If you fill the tank up too much which almost everyone does to get a liiiiiitle more range, the vent tube is blocked/stopped causing the petcock to pull a vacuum on the tank which eventually stops fuel flow. Engine sputters for a bit and then dies from lack of fuel to the carbs. Open tank for a couple of seconds/close, restart, and next time don't fill it up so high! :wink:
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Old 10-05-2005, 11:25 PM
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Re: sputtering around 4-5k rpm, any sugestions?

Is it a consistent sputter at 4-5k? Was it a one time only deal? If your bike keeps dying at a light remember that your idle should be set at 1200RPM.
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Old 10-06-2005, 07:33 AM
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Re: sputtering around 4-5k rpm, any sugestions?

A pinched fuel tank line had me scratching my head for a bit. Acted fuel starved....well it was .....caused fuel lock.

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Old 10-06-2005, 06:57 PM
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Re: sputtering around 4-5k rpm, any sugestions?

I wonder if the previous owner(s) ever shimmed the needles up in your carbs. They run rough as hell below 3,000 rpm till you rich up the mixture. At least mine did. Hope this helps.
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