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Old 07-01-2008, 11:21 PM
71gtx 71gtx is offline
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Would Every Cylinder's Rings Be Bad???

Hi guys, I've been working on a 1980 Honda CB 900 Custom for a while now. I bought the bike in boxes and put it together, only to have it bogging real bad when I started it. I did a compression and spark test, spark is good. Compression in each cylinder read around 105 psi. I have a running 1981 Honda CB 900 Custom that I checked and the cylinders run around 140 psi.

I squirted a bit of oil in a cylinder in the non running bike and i got about 160 psi and it held. So, could each cylinder have bad rings, I would think it would occur on only one set but on all 4??
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