No spark on 2 cyls of 6

[walleye hunter II]

I have a 2006 Yamaha model vz250tlr and I have no spark on #'s 1 and 4 spark plugs out of 6. It runs at idle speeds and wants to surge at times. Would it be the ECU unit or the cdi box. I put new coils on it and it made no difference.

 

[Chris1956]

You probably want to repost this in the Yammy motor repair forum. This forum is for more general, non-motor electronics.