1990 K75S with misfire/no fire - K-Bikes.com - Excellence in Motion
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post #1 of 1 (permalink) Old Aug 6th, 2018, 12:57 pm Thread Starter
Join Date: Aug 2018
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1990 K75S with misfire/no fire

Hey all,

My bike has a chronic misfire/no fire on the 3rd cylinder. I though it was a clogged injector, so I pulled and cleaned it, put it back, and it started great and rode great for a half hour or so. I parked it for about two/three hours and then started it up and the cylinder was dead again.

I parked it and it continued to run with a low idle, just around 800. I thought I’d check for fire, so I pulled the plug wire off the coil and there was no difference in the idle. I put the plug wire back onto the coil and there was no difference in the idle.

(When I put the wire back on the coil, I noticed it arching from coil to wire, so I’m pretty confident that it’s getting good spark. Also I have brand new plugs.)

Then I pulled the wire off of the injector for cylinder number 3, no change in the idle. I then put the wire back onto the injector and the idle straightened out to about 1050rpm.

Question is, is it the injector or the computer? Or something else altogether. Thanks in advance!!
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