Good Morning . Help needed . I have a 1991 Yamaha C115TLRP that has been a great engine for me and does always easily start cold or warm . When cold It will start fine but not fire on the number one cylinder . I will idle out to a close fishing spot and fish for 15 minutes or so , start back up and it will be fine for the rest of the day . The next day the same thing . It has been doing this for a good while now so time to do something . I have tested coils and swapped coils and still the same thing no fire on number one when cold . I have replaced plugs . I have run a jumper wire from number one connection on the CDI to the number one coil and same thing , no fire on number one . So, doesn't that rule out everything from plugs up to the CDI ? One other thing along this same timeline , the tachometer will occasionally jump to double rpm's and then back to correct rpm's . Even though it is still charging battery could this be the problem with the number one cylinder coil not firing ? Is there something else to look at here ? Any ideas ? Thanks
