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Engine Compression
- Spectre1982
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1 - 100 2 - 110 3 - 120 4 - 110
This set of numbers was taken after putting a little oil down the spark plug hole.
1 - 122 2 - 118 3 - 125 4 - 120.
What do I need to do to restore my compression? I'm hoping new rings is all I need. When replacing the rings do I buy a standard set?
Thanks.
1982 Kawasaki KZ750 Spectre
1978 Kawasaki KZ200
1985 Yamaha XV1000 Virago
(Avatar picture is from Alleycatscustoms.com)
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- 4TheKZ1000
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When you did compression check.....you must have throttle wide open.... to get correct numbers.
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- Spectre1982
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1982 Kawasaki KZ750 Spectre
1978 Kawasaki KZ200
1985 Yamaha XV1000 Virago
(Avatar picture is from Alleycatscustoms.com)
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- 4TheKZ1000
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How many miles?
Sounds like it a tired motor.
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- Spectre1982
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1982 Kawasaki KZ750 Spectre
1978 Kawasaki KZ200
1985 Yamaha XV1000 Virago
(Avatar picture is from Alleycatscustoms.com)
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- 4TheKZ1000
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- wireman
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- The most interesting prick in the world
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posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.
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- Spectre1982
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I'm shimming the valves because they're getting close, but still within spec. I suppose I could just blow compressed air into the sparkplug hole and listen for any leaks and their location. I figured since I've got it apart for the shim job I should go ahead and do the rings and all the gaskets. When I took off the valve cover gasket it was pretty dried out. I think the leakdown test will tell me more.
Thanks guys!!
1982 Kawasaki KZ750 Spectre
1978 Kawasaki KZ200
1985 Yamaha XV1000 Virago
(Avatar picture is from Alleycatscustoms.com)
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- 4TheKZ1000
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Take your time and do it right....look it over really good.....you dont want to go back in later.....
Dont over-torque bolts.....use a torque wrench. Watch cam cap bolts and sparkplug threads.
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- donthaveakawman
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I would find some upper cylinder lubricant to put in the gas such as marvel mystery oil(which you could put in your car engine oil as well, but not recommended for your bike oil). what upper cylinder lubricant does is protects from wear and tear on your piston rings and cylinder walls.
If you want to go further you could replace the piston rings, which you would need to take the whole top end off.
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- wireman
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Carefull spinning that motor over to do a leakdown test with valve cover off on j series motorSpectre1982 wrote: I got it last year. I put 2,000 miles on it. It's been sitting over the winter, but just a couple of months. I'm not sure how well the previous owner took care of it asside from it being in the garage. When I went to pick up the KZ from him he hopped on another bike and did a monster burn out. I'm assuming the KZ got pretty rough treatment.
I'm shimming the valves because they're getting close, but still within spec. I suppose I could just blow compressed air into the sparkplug hole and listen for any leaks and their location. I figured since I've got it apart for the shim job I should go ahead and do the rings and all the gaskets. When I took off the valve cover gasket it was pretty dried out. I think the leakdown test will tell me more.
Thanks guys!!
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.
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- donthaveakawman
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