I have a 79 12a and 85 12a. the rotors in the 79 are great, but the bearings and eccentric are mauled. in the 85 the rotors are chopped up but the bearings and eccentric are beautiful. Would it be a bad idea to use the good bearings and eccentric from the 85 and mate them with the 79 rotors?

 

its a better idea to just replace the bearings, unless you're talking about the stationary gears, then yes, just use the good ones.

e shaft is the same for all the 12A's