Compression test - Kawasaki ZX-10R.net
 
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post #1 of 9 Old 05-19-2007, 08:26 PM Thread Starter
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Compression test

When we do a compression test on a zx-10r, did the motor as to be cold, or hot ????

Valve clearance checking ???? Motor hot or cold ????

Thanks.

I still wait for my shop manual but in cas somebody know.

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post #2 of 9 Old 05-19-2007, 08:40 PM
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compression and leak down tests are only to see what the base line is and to see which is the weak area.

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post #3 of 9 Old 05-19-2007, 08:44 PM Thread Starter
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Compression

I know.

So in my old time the compression test where taken motor hot, 10 cranks, and the difference between the cylinder was check that way. But the thing are the moment you get to the spark plugs on zx-10r the motor is not exactly what we call hot, that's the purpose of my question.

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post #4 of 9 Old 05-19-2007, 08:56 PM
 
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engine cold or hot does not matter as long as you are just trying to find a leaky cylinder.....


A proper compression test requires that you put a few squirts of engine oil into the cylinder to seal the piston rings - that means that it won't really make (MUCH) difference if the engine is cold because the oil will help to seal the rings to the cyl-walls to create compression.....


Also, you will suffer great pains trying to pull plugs out of a HOT engine. !!!!!!!!!!!!!
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post #5 of 9 Old 05-19-2007, 10:02 PM
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yeah, pretty much. If 3 cylinders are at lets say 110psi and one cylinder is 60psig, then something is amiss. I never did the oil thing though.

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post #6 of 9 Old 05-19-2007, 10:08 PM
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compression test

Well the correct way is with the engine cold,full throttle, crank till you get max reading.Don't use oil.Only use oil if you get a cylinder that reads low, give it a couple of shots of oil .If the pressure comes up your getting ring blow by,if it doesn't you have a valve not sealing

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post #7 of 9 Old 05-19-2007, 10:14 PM
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Dang, hate forgetting. Thanks for the reminder.

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post #8 of 9 Old 05-20-2007, 01:48 PM
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Valve clearance checking I've always done cold. Not a couple hours since last ridden. COLD.
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post #9 of 9 Old 05-21-2007, 07:12 AM Thread Starter
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Found the problem

Well compression test tell me that was something wrong.

Found it a bent valve. So know I got to replace it.

Somebody got the experience of pulling out the head of this zx-10r 2004-05 ???

Good place to buy valves and probably seat and seal, and head gasket ?????

What was the hing with the thin head gasket ?????

Did the bike could work with pumping gas after that ???

Any advice welcome, maybe on the tech section.

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