my 86 zx10's flat when i giver the gas - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 4 (permalink) Old 05-29-2008, 11:05 PM Thread Starter
 
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Angry my 86 zx10's flat when i giver the gas

the bike ran fine all day,suddenly i giver a shot of gas and its flat.cruises just fine at low rpms and idles good.but when i need the power it flattens off.whatever it is all 4 plugs show evenly lean on all 4.ive got good gas flow.i just rebuilt the carbs and i rode all day with no problem,5 minutes from home and this problem arises.any help or insight would be appreciated.
Mike
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post #2 of 4 (permalink) Old 05-30-2008, 10:03 PM
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This'll sound stupid but did you get all the vacuum lines back on and unkinked? That bike uses vac accuated slides when you hit the throttle. Also,are you sure the carbs are synched and are all the boots tight? Did you make sure to tighten all the caps so no air can get in past the diaphrams? Try spraying carb cleaner around the carbs sides with the bike idling and see if the engine stalls or surges. I know those boots to the intake manifold can be a pain if you don't have the right tools to get in there and tighten them. Not to mention the boots between the carbs and the airbox! I use a flexible extension for that kind of work. Hopefully you snapped the needles back into the carriers snug. Hmmm no offense but is the petcock turned on all the way? Did you check the fuel filter? If you take the air box back off,make sure that the slides move freely back and return closed imediately and approx in the same amout of time. Let me know and I'll check for a service manual for that bike in the database,I do believe it is in there. If not,those are Keihnin (sp) carbs and any Kaw with them will be setup similar. Goodluck!

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post #3 of 4 (permalink) Old 05-31-2008, 01:27 AM Thread Starter
 
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thanks for the reply. I have came to the same conclusion that its vacuum related.If the vacuum valve is faulty im guessing that when i apply throttle its not allowing the vacuum to the carbs????and in turn not allowing the needles to rise???? I have the Clymers manual but its vague in its desription on the air suction system and individual components and how they work.Your reply leads me to believe im on the right track.Thanks.Im going to replace the Suction Valve.Im convinced the carbs are set good(i just rebuilt them) and there are no vacuum leaks.Ill give it a whirl and see what happens.
thanks again
mike
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post #4 of 4 (permalink) Old 05-31-2008, 01:44 AM
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no prob goodluck

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