magneto mounting

dero · May 15, 2010

I have a set of Mk2 crankcases that have been machined to take a magneto,but no mounting studs are fitted.
I want to fit a blank plate and it would be nice to get it right so a mag could be fitted if needed later.
How critical is the positioning of the studs for chain tension and timming of the mag ?

Dero

Fullauto · May 16, 2010

Where's it mounted? Behind the timing cover? I have a motor with the magneto (Joe Hunt) mounted there but others were mounted on the end of the cam.

dero · May 16, 2010

Yes its behind the barrels on the timing cover as per domminator.
There is only a small amount of adjustment via the mounting studs.
As a matter of interest how do you find the joe hunt? Has it been good?
I am using a trispark ignition but I want to get it right just incase I ever need it.

nortonspeed · May 17, 2010

dero said:
Yes its behind the barrels on the timing cover as per domminator.
There is only a small amount of adjustment via the mounting studs.
As a matter of interest how do you find the joe hunt? Has it been good?
I am using a trispark ignition but I want to get it right just incase I ever need it.

I raced over 15 years with a Joe Hunt Magneto and highly recommend it. No ridiculous hidden-inside-armature capacitor, no irregular point-slip-ring, separated high and low voltage coil and it works a treat.

pelican · May 17, 2010

Man that fits in there pretty nicely

dero · May 17, 2010

I have never seen the domminator setup.
How much will the stud position affect the timing and chain adjustment?

Dero

dero · May 17, 2010

That Joe Hunt looks like a tight fit, looks like the studs may have to be spot on.

Dero

Doug MacRae · May 17, 2010

I run a vintage Joe Hunt magneto just like the one above on my race bike and it has been excellent. Surprisingly when we swapped and ran the points-driven magneto against electronic ignition back to back on the dyno we only had a 1hp loss in power running points- for the great convenience of running without a battery, I can live with a 1hp hit.

magneto mounting

dero

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