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Old 10-16-2011, 04:24 PM   #1
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Question 1972 Cheetah spark issue

Hello everybody,
I have a 1972 340 Cheetah that has a spark issue. I have spark on the PTO side, but not on the mag side.
I have found the resistance specs for the 1973 here in the forums, but it looks like the 1972 coils are a slightly different part number for new parts, so I am assuming that they may be different.
I checked the external coil resistance between both sides and they are pretty much identical, so I think I can rule out the external coils.
Does anybody know the external coil, as well as the magneto and lighting coil resistance specs for the 1972 340 Kawasaki engine?

Thanks.

Robin
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Old 10-17-2011, 10:36 PM   #2
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Try cleaning the points first off.
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Old 10-18-2011, 09:47 AM   #3
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Have already done that...
I was hoping that was going to be the easy fix.
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Old 10-18-2011, 01:56 PM   #4
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What about swapping the condensors around to see if spark changes to the other cylinder? And you checked to make sure points were opening on the set that isn't working?
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Old 10-18-2011, 09:11 PM   #5
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That's a good idea...
My first thought was reversing the coils, to see if the spark moved, but they are idiot-proofed against that at the factory. But, like I said above, the external coil resistance is identical, so the condensers might be a better place to start.
Thanks for the idea.
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Old 10-19-2011, 08:26 AM   #6
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If the coils ohm out identical and you have spark on one side, the power side is doing it's job, to me it sounds like "trigger" which points back to points and condensor, pardon the pun
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Old 10-20-2011, 08:41 PM   #7
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10-11 Mileage:
09-10 Mileage: 440
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I've had a similar experience on my 72 Panther. I cleaned the points, ohmed out the coils, etc etc. The motor (Kawi 440) would run great most of the time but would sort of lose a cylinder from time to time and every time I checked it when it was happening it had weak spark on one of the plugs (can't remember which side), I replaced coils, new plugs, cleaned points, etc. I came across a new set of OEM points at a swap meet and last year I rode 400 trouble-free miles ! Another trick (tip?) is to clean between the points with a dollar bill. It removes any wax & greasy-grit left behind after cleaning w/ emery paper. Just remember, the ignition systems on these old girls were marginal at best, especially at low RPM.
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