Compression test on a 660 - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 4 (permalink) Old 04-05-2012, 06:35 AM Thread Starter
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Compression test on a 660

Picked up a used engine for my 07 Rhino. Any idea what numbers i should be looking for on a compression test?Thanks
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post #2 of 4 (permalink) Old 04-05-2012, 06:57 AM
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i believe you have to do a leakdown test
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post #3 of 4 (permalink) Old 04-05-2012, 08:20 AM
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I heard there was a test sequence in the manual for checking compression with the decompression release intach, never checked into it....let us know...

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post #4 of 4 (permalink) Old 04-05-2012, 08:49 PM
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I just went throught this and scared the crap out of me @ 70 lbs. So I made some calls and found out to get the best result with a compression test and not a leak down test.

1 Make sure battery is fully charged.

2 Make sure you use a good tester not a Harbour Freight.

3 Push the throttle to the floor when cranking.

I ended up @ 130lbs up from 70 after making these changes which was a little low but my valves were extremely tight so after the valve adjustment I am positive it would read where it should. I do not know for sure but I believe the 660 should be around 185 lbs.
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