neutrol lignt working, charged battery, but no spark.
any help please

 

i put a new spark plug on the wire and turned over the engine and noticed a very weak spark. i put the plug in and the bike started up ok. I have noticed that the bike gets harder and harder to start as time goes on with the same plug. the plugs all seem to be burning a nice brown to tan color with no buildup.
any suggestions on what causes the weak spark.
Going to the dunes on Thur for the holidays and need to fix the problem asap
thanks
Ray

 

Just had the problem over the winter and it was very fustrating!! But I did find the problem and fixed it (myself). Yamaha uses universal spark plug boots. These are the kind that you cut 3/8" of the end of the wire and then jam the boot on effectively splicing the wire onto the boot. Although Yamaha offers theier version over the counter at the dealer...don't buy it it won't fix (the boot hits the head).....Buy the one for it OE ONLY from the dealer..it's only 23.00 dollars and it will work as long as the last one. P.S. you only get one shot at a ew boot, they mke the wire from the coil too short to ty more...If yours was aready done, ou'll have to replace the coil under the hool (80.00) and do the gnd wire at the same time (they get rusty)

The reason why you guys are getting mixed results after changing plugs is because your shaking the connection to the plug