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Kawasaki ZX-9R - Most underrated sportbike
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PostPosted: Thu Oct 24, 2019 5:20 am 
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Mine presents likewise. She seems to run good for her age. My mileage is much lower. Still below 50K miles. If leakage at rings is ever suspected, Yamaha makes a product called “Ring Free” I think. The purpose is to free up stuck and carbonized rings. Some put a few ounces of that in each cylinder and let it set. Some run (add) 5-6 ounces in a full tank of gas.

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I have a 2002 ZX9R F1 version.


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PostPosted: Thu Oct 31, 2019 6:02 am 
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Location: Blackfoot, ID: ZX-9R sE1*, E1, & sF1*; all CA EVAP models. * Supercruise capable
One of the ideas I had was to grind off about 1.5 mm of the top of each of the valves, then grind new valve seats, but I gave up on the concept because I'm still not clear on whether it's brittle valve oil seals or slop in the valve guides.

That's why I'm thinking I'll just use the components from the old motor as spares for the newer 34K motor, just as I have spare CVR & CVK carburetors. Cheap parts and insurance for keeping the three bikes on the road.

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Kawasaki ZX-9R Ninja EVAP sE1. At the track she's said to be outclassed, but on the street, she reigns unmatched.
You’re encouraged to challenge that claim. I pick the course.
-- Mods: Nissin caliper upgrade, SuperTrapp Aluminum Racing Series exhaust (Made in USA), ZG sport-touring shield, Keihin rejetted, éan creiche malar stripes.


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PostPosted: Sun Nov 10, 2019 3:59 am 
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If I’m understanding you right... grinding the top where the shim sits?
Spares are always good.
I think one of the great benefits of being into older bikes is that there’s (should be?) plenty of used engines out there and probably minimal demand for those engines so hopefully reasonable prices. That’s all hypothetical. Wreckers tend to ask scary prices even for old stuff. Of course, if you keep your eyes open over the time, you can come across some pretty great deals on parts. But you have to grab up that stuff before true need presents. And that’s a gamble cause “true need” may never present! Needless to say, I’ve got a lot of spares that probably won’t ever get used!

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