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Bike won't idle below 1700
- New 750
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1977 kawasaki KZ750
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- Richardb98
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1977 kawasaki KZ750
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- Richardb98
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1977 kawasaki KZ750
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- bountyhunter
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BTW: the 750 twins use 32 mm valve shims, they are hard to find.
1979 KZ-750 Twin
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1977 kawasaki KZ750
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- bountyhunter
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are you sure it's not cooked on oil? These are known to have bad valve seals that let oil run down onto the plugs.New 750 wrote: Last night I pulled the carbs off for the millionth time, stripped them and boiled them, also I now know I'm running stock jets, 45 pilot, 125 main, I have pods and a two into one exhaust system, I would think that would be to lean, yet I'm showing signs of rich, plugs fouling every 100 miles, there black with soot!,
And yes, with pods that setup is too lean. I run 50 pilots on mine with stock airbox and pipes.
I don't know how a coil would know to run bad only at lower RPM's. You should check your battery in case the batt voltage is dropping since at lower revs the alternator output is too low to run the system and it runs off the battery.
Is the coil you have new or used?
Also: make sure that "coil mod" isn't killing you. If the electrical system voltage is dropping at lower revs it could be letting the relay open and that would instantly kill the ignition. I would hard wire the coil in as a test to make sure that relay isn't screwing you.
1979 KZ-750 Twin
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1977 kawasaki KZ750
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- SWest
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Steve
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- MDZ1rider
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2nd, the bike won't run right with pods and a pipe with stock jetting. If the plugs are black and sooty that has nothing to do with the jetting, and everything to do with a running problem. Running a bike with stock jets and pods will cause the engine to run lean and hot, if it runs at all.
Propane and/or spraying crap on the outside of an engine is an unreliable way to check for air leaks. The high idle indicates the bike is most likely lean.
Poor carb vacuum sync can also cause the idle to be unsteady, as would a variety of other maintenance concerns. I'd go and check all the basics and work your way through all the maintenance tasks. You may fix the bike along the way, and worst case, you will know what the problem is not.
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