1966 johnson 60hp magneto ignition burning rotors

[leadpencil2]

i understand its fairly common to see these rotors fail but i seem to be really going through them. 2 in one day on the lake, am i doing somthing wrong or is there somthing i can do to prolong a rotors life? any help is appreciated, this is fustrating.

 

[Daviet]

Re: 1966 johnson 60hp magneto ignition burning rotors

Are the rotors arching through to ground, are they melting?

 

[leadpencil2]

Re: 1966 johnson 60hp magneto ignition burning rotors

I beleive they are arching through to ground. There are visable signs of melting.

 

[Daviet]

Re: 1966 johnson 60hp magneto ignition burning rotors

Are they OEM rotors. Is the little brush and spring between the rotor and dist cap?

 

[leadpencil2]

Re: 1966 johnson 60hp magneto ignition burning rotors

They are OEM rotors, actually they NOS. I'll double check tonight but I beleive the Spring and brush are in place. Just a thought, as I am using NOS rotors, does anyone beleive that the plastic has broken down and maybe more sensitive to shorting out.

 

[boobie]

Re: 1966 johnson 60hp magneto ignition burning rotors

Put some dielectric grease on the mag shaft before installing the next rotor.