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Originally Posted by lylemills
I am all of the sudden having trouble with my 1500 Classic FI (2002) misfiring after warming up. Due to the increased electric demand of the FI. I am wondering if a week battery could be the culprit. It's a 2002 1500 Classic FI and still has the origional factory battery in it. (4 years old) and the bike still starts fine. If I am dreaming don't hesitate to tell me. And if anyone has an idea as to what the problem could be could you guide me in the right direction? Would hate to take it to the dealer, for something simple. $$$
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Thought this would be of intrest to some of you all. The problem all boiled down to a bad (defective?!) spark plug. Plugs were only about 1000 to 1500miles old. On the cylinder that was missing it was the rear right side plug. The only one that I found a brown ring arround the insulator not on the business end but on the glass insulator right above where the ceramic and the steel mate. See attached document. Spoke to a mechanic friend of mine that works on high end import autos. When I told him on the phone what I found he did not even hesitate, he said that this plug was shot, I just described it to him he didn't even look at it.
Just installled a new set of plugs, and rode the bike for about 10 miles and no miss!!!! With the bad plug the bike would start missing within about 1-2 miles of riding. Looks like the mating process (ceramic to steel) failed on this particular plug. I have never in 30 years of riding seen a plug do this. And I have owned 2 harleys (older models) and have seen some ugly spark plugs come out of them often. But nothing like this, The brown ring looked like baked on oil and could be scraped off with a finger nail. Would be intrested in knowing if any one else has seen or heard of this? This problem has been pestering me for about 3 weeks now. Thought it was a wire shorting or possibly a spark plug wire breaking down. Isn't it amaizing how it's the simplest things that we over look when there is a problem.
Lyle
2002 1500 Classic FI.
Mods
VH Longshots. (open)