zr550 running funky, need help!! - Kawasaki Forums: Kawasaki Motorcycle Forum
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post #1 of 2 (permalink) Old 10-24-2010, 02:20 PM Thread Starter
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Join Date: Oct 2010
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zr550 running funky, need help!!

I have a 1990 zr550 zephyr. I've had this problem with my bike for a while, but it's slowly getting worse. It started with the engine running a little chunky, I could hear it wasn't running properly and the throttle wasn't as responsive in low rpm's. It has now progressed to bogging down in low rpm's when the engine is cold, once it warms up the bogging goes away but the hesitant throttle persists. Getting the bike to start is also getting more and more difficult. Also, my gas mileage isn't that great, I get about 25-30 mpg.

Changed the plugs, cleaned the air filter, put in seafoam, with no result.

I've noticed the exhaust pipe coming off one of the cylinders isn't that cool bluish-purple color, so I thought maybe that one isn't firing properly to heat up that pipe??

Any advice as to things to try out or check would be appreciated!!

Thanks in advance,

Last edited by theothrwhteguy; 10-24-2010 at 02:24 PM.
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post #2 of 2 (permalink) Old 01-31-2011, 12:16 AM
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Join Date: Jan 2011
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I have a 550 Zephyr too, same yr - 1990. Sounds like one of your coils is crapping out or you need to clean your carbs. If your engine knocks while idling, you may need to replace the cam chain tensioner. Famous problem for Zephyrs. I would start by testing out the coils.
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