Join Date: 08-10-2004
Location: Victoria, BC, CA
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Re: 03 954 only firing on 2 cylinders ??
Had a cylinder not firing on my 02 954. Thought it was the regulator, turns out it wasn't. Pulled one plug at a time, grounded it, and cranked the engine with the fuel pump unplugged. When looking closely the plug was sparking, but the spark was going to the threads, not to the electrode. The insulator was cracked. Don't know if it's all that common with bikes, but I have had it happen to a lawn mower. This plug only had 3K Kms on it, was probably dropped during shipping.
It's a quick cheap test. If you're going to try to diagnose any further electrical issues/sensors get a manual. It gives the procedure and voltage/resistance you should see at different places rather than switching components. It's a lot easier to measure the resistance of a fuel injector than pull the rail off swap it to another hole.