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Old 01-23-2009, 09:41 AM   #24 (permalink)
e1_ZX-9r
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Joined: Sep 2008
From: Blackfoot, ID
I Ride: 00 ZX-9r Lime Green

Posts: 716
Thanks Zed!

"Atleastitsnotaford," I think your 9 would benefit from a carb and cylinder checkup. I hope too that you are using your choke/enrichener during cold starts.

To test, try starting it cold. When it's at its worst, turn it off and pull the spark plugs. I would imagine the tips should be black and wet, assuming the enrichener is dumping non-atomized gas in. Plug color can tell you a lot about how your bike is running.

There are lots of possible solutions, from valve float to leaking carburetor intake boots. Click on my e1_ZX-9r handle on the left and see my other posts. I've posted a bunch of info done to mine that might help you get your 9 straightened out.

BTW, to test if your intake boots are leaking, begin with the engine cold and a water hose near by. Start the bike and run small amounts of water over the tops of the intake boots & carbs, if the engine stalls or stumbles, you have an air leak between your carbs and cylinder intakes. Maybe simply a loose fastener.
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