Low Compression, Low KM's! - Grizzly Riders - Yamaha Grizzly ATV Forum

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post #1 of 1 (permalink) Old 06-13-2017, 12:32 AM Thread Starter
2004 Grizzly 660
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Low Compression, Low KM's!

Hey guys

I just acquired a 2004 Grizz 660 with only 350 original KMs! I had a new carb and battery installed, valves adjusted and gave it a good cleaning. The bike seems to run well but i just did a compression test and im getting a reading at 115 PSI. From what i read the compression should be around 188 PSI, with 163 PSI minimum. i know the machine sat for quite a few years without running. My question is... will the compression get better with more riding (internal seals and rings need to be worked in) or do i need to start ripping the motor apart. Any advice is much appreciated.


Last edited by bennyb; 06-13-2017 at 12:56 AM.
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compression, low

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