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Engine bog has me boggled
- Ronnie_D
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- 1978 KZ1000 A2
I need a little help with this one. I have a 1978 KZ1000 A2. All stock. When I drive normal it runs fine. When I roll the throttle on from 3000 rpm it starts to accelerate but then bogs down terrible. Its like it is not getting fuel. I am not sure what is causing this
Here is what I have done so far.
cleaned and checked petcock, new gas.
thoroughly cleaned and set the floats on the carbs.
set ignition timing and checked advance, Dyna pickups and coil system.
new NGK spark plugs.
new plug wires and caps.
carb to intake connectors look good.
new combo rectifier / regulator, works fine.
I haven't checked the valve clearances but they sound good.
I do not have the airbox connected, but that shouldn't cause this issue.
It was running rich and stumbling/backfiring on acceleration before I started to tune it to a leaner setting. Now it is leaner, no backfire, but bogs down.
any thoughts on this one?
thanks,
Ron.
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- Warren3200gt
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- Ronnie_D
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Warren3200gt wrote: 3k rpm is about where main jet becomes active. Did you clean the jets and passages when setting the floats?
I took out the jet sand their tubes, I will have a look at the passageway a bit better.
thanks,
Ron.
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- TexasKZ
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1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- SWest
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Steve
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- Ronnie_D
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I am checking the valve clearances
thanks, guys,
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- Ronnie_D
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The book says between 0.05 and 0.10 mm, is this for intake and exhaust?
thanks,
Ron.
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- Scirocco
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My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- Ronnie_D
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The carbs are as near perfect as can be.
The valve clearance is within spec from .07 to .08, good to go.
My friend Rolf and I were working through the issue and think it is the Dyna pickups. Its seems like an ignition problem. There is nothing left.
Coils tested good.
We did a rudamentary test on the Dyna but I can't find any "how to" documents on it.
Does anyone know how to test the Dyna pickups?
I don't know the model number of the Dyna pickups. Can anyone identify it?
here's a couple of pictures...
thank you for all your help. It is appreciated.
Ron.
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- slmjim+Z1BEBE
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Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
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- Ronnie_D
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slmjim+Z1BEBE wrote: What is voltage at the coil primaries vs. battery voltage? Voltage drop across the ignition switch can be significant.
Good Ridin'
slmjim & Z1BEBE
the voltage was 11.6v at the coils and 12.8 at the battery.
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- Ronnie_D
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bizzare.
any thoughts?
cheers,
Ron
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