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Low Compression
- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- Patton
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If not already doing so, the throttle should be held in wide open position when performing the compression test.BIGKEVIN wrote: I have a 1976 KZ900 with a stock motor, as far as I know. I can install new plugs and they will be oily and wet after being run for a few miles. I did a compression test on the motor when the motor was cold. All of the cyclinders are between 70 and 85 psi, which are all low. Should the compression test be done on a cold motor or be done after the motor is up to normal operating temperature ? Thanks.
Can add a teaspoon of motor oil through the spark plug hole to determine whether it affects the compression figures.
Would also check the valve clearances and assure the clearances are within specs.
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1973 Z1
KZ900 LTD
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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When compression testing with a warm engine, the oil between pistons and cylinder walls helps seal compression as it does during normal running.
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1973 Z1
KZ900 LTD
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- Patton
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Thickness gauges are used to measure between each cam base and shim, with the cam pointing away from the shim.BIGKEVIN wrote: ...where I can get good instructions on how to check the valve clearance ?
The Factory Shop Manual has the best instructions.
May use this link to download the manual from KZr's FILEBASE.
Click here > www.kzrider.com/filebase/doc_download/43...asaki-service-manual
Scheduled maintenance calls for checking valve clearances at intervals of 4000 miles.
Click here > www.kzrider.com/filebase/doc_download/346-periodic-maintenance .
Good Fortune!
1973 Z1
KZ900 LTD
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- bluezbike
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79 KZ 1000 LTD
77 KZ 1000 B1 LTD (awaiting electrical resurrection)
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- bountyhunter
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Compression test has to be hot.BIGKEVIN wrote: I will try adding a teaspoon of oil to the spark plug hole to see if it makes any difference. Does it matter if the engine is hot or cold.
1979 KZ-750 Twin
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- BIGKEVIN
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When I do the shims, do I order the same size shims that are in there now ? Thanks for the information thus far.
1976 KZ900
2006 ZX6R
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1979 KZ-750 Twin
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- bluezbike
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79 KZ 1000 LTD
77 KZ 1000 B1 LTD (awaiting electrical resurrection)
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