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You shouldn't have to. I believe the 81 is a computer controlled ignition system. Times it self.. Unless the previous owner retro fitted points for some reason.
Well that's a load of B*llocks.
You always have to time your bike regardless of the ignition.
If you have a boyer then you simply turn the crank to full advance and then set the pickup on the boyer ignition to match. the white dot has to be seen thru the hole in the boyer plate.
its pretty much the same with the 81
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