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Low voltage to coils
- ThatGPzGuy
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The voltage drop to the coils is about 1.5V. Is this enough to cause one side not to function at low RPMs? If not, my next step is going to be to replace the igniter.
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"
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- ThatGPzGuy
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Sigh... Igniter?
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"
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- mopguy
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I have a 1980 Kawasaki KZ750 Ltd. I bought new. I recently managed to get it out of my garage after 28 years and put it on the road again (2010). I feel like a kid all over again. Since I have acquired 3 78 KZ1000 Ltd, 1 1981 KZ1000 Ltd, and another 1980 KZ750 Ltd. Love the LTD's.
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- Nessism
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- ThatGPzGuy
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Hi Nessism, The top end was done last year. Valves were adjusted, carbs were unganged, taken apart and put thru an ultrasonic. Compression is fine. I've swapped in carbs from my GPz and I get the same result. The plugs for 1 and 4 are tan. The plugs for 2 and 3 are dark and sooty.Nessism wrote: You sure it's not mechanical or fuel related? Adjust valves and compression check? Clean carbs including the pilot circuits and new O-rings throughout?
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"
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- Nessism
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- JMKZHI
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After making sure it isn't the spark plugs, I would make certain the wiring & connections are good. I would remove each wire from the igniter connectors & pulsing coil connector for cleaning & inspection. A terminal pin removal tool is handy.
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- ThatGPzGuy
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JMKZHI wrote: You've swapped the ignition coils & the pickups coils. How about the spark plugs? Have you done the igniter tests outlined in the FSM?
After making sure it isn't the spark plugs, I would make certain the wiring & connections are good. I would remove each wire from the igniter connectors & pulsing coil connector for cleaning & inspection. A terminal pin removal tool is handy.
Yes, Spark plugs were swapped. So were the wires. I get a spark from two and three but it seems sporadic and weak. When this first happened I replaced the stock coils with Dynas. Same result.
I went thru the igniter testing in my Clymer manual and it passed but then there is a caveat that says "if the igniter passes these tests you should replace it with a known good one and see if that solves the issue. Some transistorized ignition troubles won't show up on a bench test."
I'll check my connections.
Thanks
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"
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- JMKZHI
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- ThatGPzGuy
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I have a KZ1000 factory manual I am going thru now. I tested the pickup coil resistance and they are within spec at 402 and 404 ohms.
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"
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- ThatGPzGuy
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Voltage from the 4-pin connector are within spec for the red and blue ( .82V) but below for yellow and black (.19V).
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"
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- loudhvx
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You can swap the circuits to see if it's the igniter circuit that is dead.
You swap the big green wire from the 2-3 coil with the big black wire from the 1-4 coil.
Then on the small wires, you swap black with yellow, and swap blue with red.
That makes it so the pickup and coil for cylinders 2 &3 are using the 1-4 igniter circuit, and the pickup and coil for cylinders 1 & 4 are using the 2-3 igniter circuit.
If the 2-3 igniter circuit is bad as suspected, then 2 & 3 will now fire, and 1 & 4 won't.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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