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  #1  
Old 12-04-2017, 07:33 PM
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Default 1986 cr250 compression test

     

So I decided to double check the compression. Goes up to 180 then slowly back down to 0. It suppose to hold the test pressure ?- yes. What do I do next. Is it time for a one over bore job & new piston and rings.

---------- Post added at 08:33 PM ---------- Previous post was at 07:55 PM ----------

Sprayed soapy water around the head, no bubbles (leaks) ??????
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Old 12-04-2017, 09:12 PM
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Sounds like your are confusing a compression test with a leak test. A 180 reading on a compression test is good. Your piston and rings should have some life left in them.
You can do a leak test and it should hold about 6psi for a minute or so to be good.

Paw Paw
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Old 12-05-2017, 10:54 AM
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Thanks paw paw. Just trying to cover all my bases, for why the dam thing won't start. A little confused, cause I've watched videos of compression test where there gauge holds the pressure longer then mine does.
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Old 12-06-2017, 05:42 AM
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Sounds like your gauge is faulty.
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Old 12-06-2017, 06:59 AM
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It's brand new from NAPA
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Old 12-07-2017, 06:07 AM
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It shouldn't leak down. It is suppose to hold the highest reading. Mine has a Schrader valve, just like the one in your inner tube, and it holds the pressure until I release it.
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Old 12-07-2017, 07:03 AM
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Pulled cylinder off last night. Of course my luck piston, rings, & cylinder all look fine. Going to get it checked out. Thanks everyone's replies.
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