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Old 02-17-2008, 11:56 AM   #1
Mike18212
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Question 87 gsxr stops running @ high speeds

I have an 87 gsxr 750 with pods instead of an air box. At sustained speeds above 80mph the accelration starts to get weak, choppy and eventually the bike loses the power to accelerate at all and i have to pull over. As soon as i stopp giving it gas it stalls. It was almost like i had ran out of gas but this hap happened several times and gas was good every time. I checked my fuel filter but it looked clear, and when placed on prime it seemed like i could see fuel flowing freely down the tube. I cleaned the pods, but not well. however i popped one of the pods off while riding and it still happened so it doesnt seem that clogged pods are the reason (?) I've had the carbs cleaned about 700 miles ago (when i bought it) so it seems that shouldnt be an issue. ALso, after pulling over (on the highway in the shoulder, which always sucks) i can get the bike to run again if i just let it sit for awhile. But even then it may or may not run like nothing happened in the first place, as long as i keep it below 80mph give or take. I also have a fairly bad oil leak but i keep an eye on it and im waiting for winter to end to do something about it.

Any help is hugely appreciated!!!
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Old 02-17-2008, 12:18 PM   #2
sachiwilson
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Check to see if the tank vent tube is pinched. That can cause a vacuum in the tank that will prevent gas from flowing to your carbs.
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Old 02-17-2008, 03:07 PM   #3
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Are you saying that if you run at 60-70 mph, it will run fine all day? I knew a guy who had virtually the same problem on an older bike. The rings were sticking, and the engine lost compression when the bike got really warm. Try a compression check when it's cold and again after it's heated up.
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Old 02-17-2008, 05:56 PM   #4
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You're certain on the fuel-flow thing?

Wife of mine had an EX500 - would "run out of gas" when on reserve (with gas still in the tank) Fuel flowed just fine, or so I thought. Turns out, the fuel-passage in the petschlong wasn't drilled-through completely - had this tiny little hole for fuel on the reserve side.

A bit of quality time with a drill press and the properly-sized bit cured that problem.

I'm not sayin' that's the problem with yours: but it turns out it was with hers.
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Old 02-18-2008, 06:11 AM   #5
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Sounds like classic vent-tube restriction symptoms.
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Old 02-18-2008, 06:30 AM   #6
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Quote:
Originally Posted by The_AirHawk View Post
the petschlong
I guess it's better than "petpenis."
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Old 02-18-2008, 06:31 AM   #7
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True enough. Ride it with the gas cap cracked open and see if the same thing happens. Just don't have a full tank of gas trying it.
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Old 02-18-2008, 11:05 AM   #8
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Please remember your bike has a vacuum operated FUEL VALVE (same as a petc0ck) so check to see if you've got a vacuum leak at that junction, also, how does it run on "prime"? Since Prime bypasses the diaphragm and the whole vacuum process all together...
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Old 02-18-2008, 11:35 AM   #9
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Quote:
Originally Posted by Kenneth_Moore View Post
I guess it's better than "petpenis."
Well, I considered using "petweiner", but surmised people might think I was talking about a Dachsund.
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Old 02-18-2008, 01:29 PM   #10
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Quote:
Originally Posted by The_AirHawk View Post
Well, I considered using "petweiner", but surmised people might think I was talking about a Dachsund.
My first wife had THREE of those things, Oreo, Prissy, and Brandy. Prissy got excited and peed the floor every time we came home. Brandy had some sort of skin disease that left crumbs in the bed. It was like laying in Rice Krispies. Oreo had the habit of dry humping everyone who set foot in the house. Good times, goooood times.
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