Power loss, idle drop.

Mizz-Firings suck!!! Just ranting about a Ford Mod 4.6 motor. Anyway, you could always measure the jump of spark from each coil with a Hexton Spark Checker. Should be at least 1/2 half an inch.

 

Ok, to catch up: I've ridden almost every day for the last 3 years so when it acts up I can tell. The gas tank is perfect and the coils could ignite the space shuttle. Plugs look great. I have some of ridervfr's B12 Chemtool, but I hate to use that stuff because it's like plutonium to paint, rubber and plastic. When I pull them off again this weekend I'll administer some via a needle applicator I have. My son's roommate gave me some used E guitar strings to work on the starter and pilot jets (which I think is my problem) Regarding the Ford 4.6; those are notorious for blowing the plugs clear out of the head so be careful when you pull and put them back in-the threads are screwed up from the factory on about 10% of the total production run.
Thanks to everyone for their helpful input-My '97 has been trouble free for about 3 years so one forgets what to look at when there is a problem.

 

This may be mizz-information as the gap a healthy motorcycle ignition coil will spark in air is about 7mm.

 

Hate to be the bearer of "mizz-information." I had the opportunity to be testing spark on my gen 3 bikie and all four coils were consistent with aboot 1/2 an inch or 12 mm give or take ; )

Just to change the subject for a second, there are companies that make expensive kits to extract broken spark plugs out of Ford Triton V-8s for a reason. I have a 4.6 Modular motor that had a mis-fire and I ended up going with Accel coil on plug coils, 8 of them cost as much as one OEM Ford coil...:backtosubject:

Engineers screw things up too :smile: