Actually, pretty simple. Take the cap off to note the position of the rotor. Leave wires on the cap (unless you are going to replace that also). Remove the ground wire on the side of the current mag. There are 2 bolts on the base on the block end opposite the cap, one at the top, and one at the bottom. Remove the bottom bolt, then remove the top bolt. Slide mag out.
Clean the old gasket off the block. place new gasket on the new mag, and with the cap off, orient the rotor on the new mag to the same position as the old one (this should case the drive slots to line up). The mag should be in the same position as the old one. Replace bolts, replace ground wire, and put cap with the wires back on.
finished.
Just did one 2 weeks ago this way. PS, you didn't say if the new mag had new cap and rotor, but best if you use the new parts.
This post was edited by Tom Fleming at 02:33:45 10/17/10.
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