View Full Version : Joe Hunt magneto cam drive

05-02-2012, 6:58 PM
Are there 2 different cam drives for a joe hunt magneto?

I have a hunt magneto and am going to put it on a 1969 triumph 650 and it came off a 1978. I know the bolt to hold the cam shaft drive on is different but is the taper different also? I see in the directions it says there is an A and B cam drive for different years but the only part number is 3003on the hunt website. Will my cam drive work that was on the 1978 or do I need to order one for a 1969 which is an A. I do not see any letters on mine but I assume it is a B.

05-02-2012, 7:54 PM
I've put a lot of Mags as well as hundreds of electronic ignitions Triumphs from 1963 through 1983, they all fit the same taper inside the cam. The difference is the center bolt on bikes after 1970 were 1/4" 28TPI , and the bolts on bikes 1969 and before were 1/4" 26TPI .

Hope that helps... Tony