Air bubbles
- ssalyer
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1978 KZ1000 A2A
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- ssalyer
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1978 KZ1000 A2A
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- ssalyer
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1978 KZ1000 A2A
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- chance
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- Life long biker/
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- chance
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- ssalyer
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1978 KZ1000 A2A
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- MFolks
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Some light oil like 3-in-one or sewing machine oil will work. Apply the oil to the moving parts like the springs, weights and other pivot areas.
It should return to where it's at when you twist it slightly.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- chance
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Look by the choke lever and on the flange there should be some ID numbers. Find them and post it..Did you check for air leaks??I'm not sure of the model of carbs. They say Mikuni on one side and MIC on the other.
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- newOld_kz1000
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I've got a 78 kz1000 with pod air filters. I have clear fuel line on and as the bike sits and idles every 30 seconds or so a large air bubble will come out of the carbs and into the gas line. The fuel line always has air bubbles in it. It's not the tank inlet, it will do the same thing with the gas cap wide open. Also, I'm going to replace the intake manifold because of issues with the idle not dropping back down when revved up. Could these things be related?
On a 2-stroke bike like an H1-500 Kawasaki for example, a not-returning-to-idle is a potential piston killer as it might indicate an air leak. An air leak causes a LOT more heat in the cylinder and can burn a hole in the piston. I'm not 100% sure if an air leak, ie. a 'lean' condition, is what you have -- but a bike running lean runs HOT. And you said yours is running 'hot.' And an air leak normally produces the 'won't return to idle' symptom too.
Pull your spark plugs -- if the plugs are hottish-looking, such as: the ceramic bits are white, everything looks too-super-clean -- sounds like you're running lean, possible due to an air leak. Just pull the plugs and if they're not the desired light brownish color on the ceramic bits -- yep your air leak suspicion, which is why I'm guessing you want to change out your carb intake manifolds, may be correct.
Here's how to test your intake manifolds for an air leak before you $pend money on new ones: one at a time, while the engine is running, spray a flammable liquid such as WD-40 in small squirts on one manifold at a time. When you here the engine revs spike after a short squirt of wd-40 you've probably found an air leak in the manifold. DON'T STOP THERE. A common mistake when troubleshooting is 'Ok I found the problem', then fix that, then you still have other problems -- don't assume there's only the one leak. Spray onto one manifold at a time, wait for the telltale engine rev spike, and whether you hear it or not move onto the next manifold; check all possible sources of an air leak.
Now, being a 2-stroke biker myself, I'm not even sure if an air leak, which creates a 'Lean' condition in the fuel-air mixture, causes this 'bike doesn't return to idle when revved' issue.
Could be lots of other things. Throttle cable sticking a bit? Check this by manually forcing the carb slides closed by pushing on the 'butterfly' metal throttle cable linkage on your '78 kz1000's carbs --- I have the same model/year bike, and this 'butterfly linkage' is easy to see on your carbs -- it's where the two ends of the throttle cable are hooked on to.
As for the air bubbles -- everyone who deviates from the stock black-colored fuel lines notices that. It's meaningless if the bike's running OK. If you see gas and some air in your clear fuel line, the important bit -- the gas -- seems to be dropping down from the tank to the carb, doesn't it. That's the important bit!
Now, if the fuel line is 100% air and *no gas* in it -- that's when you can worry.
1978 kz1000 A2 with Kerker
1980 Z1 Classic with Kerker
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- ssalyer
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I'll be working on the bike sunday afternoon. I'll do the tests mentioned and report back here. thank you everybody for your insight. Scott
1978 KZ1000 A2A
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