Question about 1997 kawasaki ZX-7R

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After the bike gets hot it cuts back really bad.

1997 zx 750 r had the plugs changed carbs sync,after it gets hot it still cuts back to the point of cutting off, after i do cut it off it wont fire back up until the engine is cool. MAYFEILD

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Although you have had the carbs sync,i dont think the mixture settings are correct,the carbs are leaning out to much when the motor is hot

Posted on Jul 04, 2009


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There are adjustments on carbs for low speed air intake (air mixture screw)find out factory settings and reset that mixture.Sounds to me like those adjustments are out of sink.If so the bike will run very bad from idle to about 1/4 throttle then run great from there up to full throttle.this definitly sounds like carb problem.

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Last time i drove the bike I had to leave the choke half open or it would die out ,now won't start ,sitting for two years?? how can I find a mechanic who will take on this problem as a side job?

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(361) 947-3200

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If i get on it hard it spits and sputters but when i get to speed and let off it cuts off wont crank back

Try cleaning the carbs and make sure the hoses and the diaphram in the top of the carbs are not messed up. It sounds like a vaccum problem. Make sure the carbs are in sync too.

Mar 09, 2010 | 1997 Suzuki GSX-R 750 V

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Aug 04, 2009 | 1977 Suzuki GS 750

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Cutting out at higher rpm

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It's a liquid column differential manometer, which very accurately and sensitively measures the vaccum on the different cylinders of the engine. The only other thing I can think of is your ECM, which controls the engine, and incorporates your rev limiter. These are pretty pricey, so I would do the steps above first.

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i think your issue is while at a steady cruising speed one of the carbs is not allowing steady fuel flow. so when you nail it, you cant hear or feel it. or maybe you can just a bit right when you hit it. one thing you can do short of taking the carbs off and cleaning them is, take the air filter apart and start the bike rev it up high and with a large clean rag shove it into the back of carbs and cut off ALL AIR FLOW.. at the same time, twist throttle wide open. doing this will flood out and kill the engine. but at the same time, it will sometimes clean any debris or grime out of the jets. try it a couple times.. hope this helps.

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1 Answer

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Check the carb diaphrams for any tears/pinholes? (They are on the top of the carbs) Have you reconnected the breather from the tank? Is fuel getting past fuel tap? Sometimes the vent in the fuel cap can get blocked with crud and create a vacuum which stops fuel flowing.

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