Ninja 500 low compression on one cylinder - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 2 (permalink) Old 11-03-2010, 12:55 PM Thread Starter
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Ninja 500 low compression on one cylinder

I rescently got a Kawasaki 2005 Ninja 500 with 7,000 miles that was sitting for a while and the carbs were clogged. I took them apart and cleaned them and put new carb kits in. I put it back together and it sputtered for a while and started to run okay. When I tried to ride it seemed like there might still be something in the carbs because it would rev up and run fine, but it had no torque like it should have. As I rode it for a few minutes it seemed to clear out kind of a half touque to full torque jumping back and forth and finally it ran good for about a few minutes, then it just went to back to half torque and has stayed there. I took it up to redline for a few seconds while riding it, but not just for a few seconds while trying to clean out the carbs. It was running like the high speed jets were pulgged and unplugging. However, now I did a compression check on it and one side has 180 psi and the other about 125 psi. I think the carbs are fine now. It runs and sounds fine it just takes twice as long to rev thru a gear. Anybody got any ideas on the low compression--valve adjustment, valve, head gasket, rings? Thaks in advance
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post #2 of 2 (permalink) Old 11-03-2010, 06:38 PM
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Your best bet is to perform a compression test, or better, a leakdown compression test to determine what it is. It's either valves, rings, or cylinder head.

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