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Old 01-26-2011, 12:07 AM   #1
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z120 compression

Does any one know what the compression should be on a z120, i think the year is a 2000.
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Old 01-26-2011, 02:28 AM   #2
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What are you reading now?
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Old 01-26-2011, 08:36 AM   #3
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40 psi, that was with a warm engine and the throttle held wide open and about 5 pulls. I pulled a couple of more times but it didn't go past 40. I had a knock and then it died and after doing some reading it my be the plastic Governor gear broke.
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Old 01-26-2011, 03:21 PM   #4
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I think that normall is around 80-110. I guess I should say that is an okay range. The cam has a compression realease on it that makes the motor easier to start.
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Old 01-27-2011, 06:18 AM   #5
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Looks like it will be coming out either way. Thanks for the response.
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Old 01-29-2011, 08:39 PM   #6
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mine now has 145 psi. when i first got it, it only had 65psi and smoked bad and bumped up to 85psi with oil down the cylinder (wet test). i changed the oil and took out the plug and let the oil soak on the top of the piston. Running 145psi now at WOT and 4-5 pulls. just ordered a 200cc motor from Harbor freight for 99.99 SHIPPED!!! just an idea
i also have a set of rings and head gasket here for the 120 i might not need.....good luck.
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