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carb settings?????; pullback on pull away
Topic Started: Jan 13 2007, 05:43 AM (850 Views)
shippy-rsa
Member
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Hi all ...just started at the old grindstone(commonly known as work,job..)after factory shut.Have a problem with my old dinosaur...kawa z750..starts ok and when warm idles fine but on pull-away tends to cough,splutter and hold back before getting going.Seems to run ok up to about 100km/hr but at higher speed seems to slow down then accellerate slow acellerate and sounds slightly like a diesel motor.
Have cleaned out the carbs(washed all parts ,blew the jets and air ways with compressed air at app10bar)Have cleaned out the feul tank and replaced feul (made sure no water in system).
How to balance the carbs so that all feed the same ratio of feul/air to the motor?Is there a simple way to check that the carbs are functioning as a unit?Does anyone know of a downloadable workshop manual for this bike?
Any sugestions on this spluttering issue
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Killer Canary
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200 MPH
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I'd like to know what year to make sure I don't misunderstand. It sure sounds like starvation.Did yiu also clean the in-tank screen and check the in-line filter if you have one? If not, I recommend that you fit one. If you have the bike I'm thinking of, I have a manual for a '78 KZ 650 which is very similar, I could look up specifics for you.
I use a Motion-Pro mercury carb tuner($90 CDN) which does a quick easy job of balancing.
Could you do a plug chop while it's running poorly and post the colours? We should be able to talk you through this.
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shippy-rsa
Member
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The old dinosaur is a 1980 z750 and the carbs are vacuum operated.I cleaned the in tank filter as well as the feul cock and olso installed a new inline filter .I did a float level check by putting the carbs in a vice ,levelling them with a spirit level (horizontally and vertically),fitted a feul supply line and fitted a length of clear hose to the drain ports at bottom of float bowl and by lifting the free end of the hose above the carb noted that the feul level on each carb was just below the rim of the bowl.The vacuum ports protruding from 3 of the carbs have been blocked with rubber caps whilst the fourth one operates the vacuum on the feul cock.I have replaced the plugs with new ones.I have tried running the old girl on the prime setting of the feul cock in case there was a prob with the vacuum diaphram therein but no improvement resulted.
The prob seems to be worsening as I could not get much more than 110km/hr out of the bike in top gear and a verry weak 110 at that.Opening the throttle results in a change in engine tone but nothing else and even slows the bike down whereas tapping off slightly results in a tad more speed.
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Killer Canary
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200 MPH
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Some times the diaphragm in the vacuum operated fuel valve can develop a pin-hole leak that allows fuel to flow down the vacuum line and into the carb that operates it, flooding that cylinder. Try disconnecting the vacuum line from the valve and plugging it securely, then run the bike on PRI and see what happens.
Also, the fuel valve on my 650 is operated from a port between #1&2 carbs. As far as I know, the capped off ports you mentioned are only used to synchronise the carbs and during normal operation all four are capped off. I would think that an '80 750 would be the same.
Also check for deep cracks in the intake boots between the carbs and the head.
Keep at it! They go like an S.O.B. when all is well.
Let us know what you find.
P.S. Plug colour would be helpful.
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dogdragon
Unregistered

manual fr the z750 - http://sharedmomentsonline.com/z1000/galle...50-j1_ebook.pdf I think that is a 750manual, even it's been set on the same section with the z1000 file on that site. let me know if it's right
Si
WWW.dogdragons.com
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shippy-rsa
Member
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Hi all,
Carbs still problematic.Found a tear in the vacuum rubber that operates the main jet.Replaced this,adjusted the valve clearance,replaced the timing chain(this at its max tolerance)I checked the rubber connections and although a tad perished could not see any cracks.The carbs I had balanced as I do not have the tools for this job but now the old dinosaur seems to be running a bit too lean as I am getting about 18km/l of feul but have no power and still no smooth acelleration.

Dogdragon thanks for the link to the manual but I get a error404 when I try to acsee this site.This means? B)
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