Compression loss in 04 ZX6R??? - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 2 (permalink) Old 08-01-2008, 10:07 PM Thread Starter
Join Date: Aug 2008
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Compression loss in 04 ZX6R???

Hi, I'm a newbie looking for my first bike. I found a '04 Kawasaki ZX6R with 16000 miles on it for a good price but it has compression problems. The owner claims he parked the bike last Christmas and six day later tried to start it and it would not fire. He took it into a shop and they told him he has a 85%compression leak...... Could there be any Truth to this story? Any Ideas on what could possibly be wrong? Any specific things I should look for when looking at this bike? oh and will a 6'3" 215lb guy fit on this bike? Any information or ideas will be greatly appreciated. Thanks.
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post #2 of 2 (permalink) Old 08-06-2008, 11:22 AM
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Location: Winona Lake, IN
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ZX's are known for their valves tightening up so if there was never any valve adjustment done its possible the exhaust valves aren't completely closing but not too likely.
I have seen where a bike was parked and shortly after didn't have enough compression as the rings get stuck on the piston. Yamaha makes a product called combustion chamber cleaner. Spray into each cylinder through throttle body while cranking over can do wonders. Then when the bike is running you spray through and it removes all deposits and cleans the piston and valves like new. Its important to replace the oil and will need new plugs as it burns off the anti corrision but its amazing what difference it makes. I have seen engines go from 80 psi compression to 150 in 10 minute
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