Fuse keeps blowing

[tomm]

I have a 2007 speedster 150 Last time I took it out it felt like its only running on 2 cylinders. I pulled off the spark plug boot on #1, and it ran the same ,I reconnected #1 and pulled # 2 And it would barely run,I reconnected #2 and pulled #3 and it would barely run. So I noticed that the 15 amp fuse that powers the engine fuse block was blown,so I replaced the fuse and took it for a ride and it blew again.and again and again and still feels like its running on 2 cylinders. Could anyone give me a clue to whats going on please. Thanks in advance.

 

[thor7000]

would assume it would be the same as my sportster 4TEC, each ignition coil has it's own fuse ie. cylinder #1, #2 & #3....therefore I would guess that your coil #1 is shorted and needs to be replaced. Try swapping coil #1 with #2 and see if it does the same just to confirm.

That would be my guess....good luck

 

[tomm]

I tried swapping the coils and it I still have the same problem with #1 cylinder.

 

[tomm]

Gave up and took it to dealer ,and all it was is a bad spark plug. Fuse does not blow any more . Dont understand why a bad spark plug would keep blowing fuse.

 

[seadooya]

Guess the moral would be to, start with the easy stuff first, huh?