80 kz750 4 cyl power stalls on full throttle

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07 Apr 2012 19:37 #514587 by Yotaracer4life
80 kz750 4 cyl power stalls on full throttle was created by Yotaracer4life
My kz750 suddenly had a loss of power when i was riding it, and now it backfires and dogs down on full throttle. if you turn the throttle slowly it revs up without a problem, any ideas as to where I should start? Im pretty sure that its not the carbs because they were just cleaned.

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07 Apr 2012 19:42 #514588 by 650ed
Replied by 650ed on topic 80 kz750 4 cyl power stalls on full throttle
What are you using for air filtration?
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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07 Apr 2012 19:46 #514590 by Yotaracer4life
Replied by Yotaracer4life on topic 80 kz750 4 cyl power stalls on full throttle
k&n pods, has a kerker pipe and mikuni vm29 smoothbore carbs.

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07 Apr 2012 20:16 #514595 by 650ed
Replied by 650ed on topic 80 kz750 4 cyl power stalls on full throttle
I'm positive others with solid hands-on experience will chime in with good advice, but 29mm smoothbores & pods sounds like a lot of carb for a stock KZ750 unless the carbs are tuned down a bit. Maybe someone can offer suggestions on appropriate jetting. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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07 Apr 2012 20:19 #514597 by Yotaracer4life
Replied by Yotaracer4life on topic 80 kz750 4 cyl power stalls on full throttle
Im pretty sure it has nothing to do with jetting since the bike ran great before the other night I would full throttle it and it would get up and go,

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07 Apr 2012 20:37 #514599 by gd4now
Replied by gd4now on topic 80 kz750 4 cyl power stalls on full throttle
How long ago were the carbs cleaned? Could one of the jets have worked themselves lose? Are there air or vacuum leaks on the carb holders?
1977 KZ650 B1
Pods and Denco header

OLD KAW OWNERS SMILE ALOT

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07 Apr 2012 20:48 #514601 by Street Fighter LTD
Replied by Street Fighter LTD on topic 80 kz750 4 cyl power stalls on full throttle
I always wonder about fuel, sitting and getting old and water ladden when fuel problems happen this time of year after sitting for a long time. Take the tank off and drain it and start fresh if their is any doubt. use the old fuel in a cheap lawnmower if you must.

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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07 Apr 2012 20:51 #514603 by Yotaracer4life
Replied by Yotaracer4life on topic 80 kz750 4 cyl power stalls on full throttle
the carbs were cleaned about a week ago, and there are no cracks or leaks in the carb boots everything is secured tightly. and on the gas its my third tank in the last week

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07 Apr 2012 23:55 #514634 by Patton
Replied by Patton on topic 80 kz750 4 cyl power stalls on full throttle
Perhaps there's an issue with the ignition advancer being slow to reach open position.
Might need lube, or clean and lube.




Good Fortune! :)
1973 Z1
KZ900 LTD
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08 Apr 2012 18:07 #514740 by Yotaracer4life
Replied by Yotaracer4life on topic 80 kz750 4 cyl power stalls on full throttle
the ignition advancer is clean and moves freely, I discovered that it runs better with the choke on and if I turn the air mixture screws in all the way it runs better with the choke off. but still doesnt have as much power as it should.

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08 Apr 2012 18:35 #514743 by Patton
Replied by Patton on topic 80 kz750 4 cyl power stalls on full throttle
Have the float bowl fuel levels been measured using the clear tube method?

Good Fortune! :)
1973 Z1
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08 Apr 2012 22:40 #514774 by steell
Replied by steell on topic 80 kz750 4 cyl power stalls on full throttle
Take off the petcock and clean the screens that are on top of the petcock and inside the tank.
KD9JUR

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