Setting Ignition Timing on Model 80 and 102

Author: Ric

October 12, 2010 7:19 PM

Setting the point gap and the ignition timing on a Yamato 80 & 102

1) Remove starter pulley
2) Remove spark plugs
3) Rotate crank till point follower is on the tallest part of the point cam. On the 102 it is where the cam key is.
4) Set point gap on both points to 0.012”-0.016”, I prefer gapping to 0.012”.
5) Install dial indicator in cylinder #1. Rotate engine to top dead center. Zero dial indicator. Rotate engine backwards (counter clockwise) till points close (recommend using a buzz box). Note how many thousands on the dial indicator.
6) Install dial indicator in cylinder #2. Rotate engine to TDC. Zero dial indicator. Rotate engine backwards till points close. Note how many thousands on the dial indicator.
7) Take cylinder with the highest reading and install the dial indicator in that cylinder. Rotate the engine to TDC. Zero the dial indicator. Rotate the engine backwards to desired setting. Factory recommended specs for the 80 is .180”-.200” BTDC, for the 102 is .200”-.250” BTDC.
8) Rotate magneto to the position where the points are just opening or closing (recommend using the buzz box). Rotating the engine a few thousands above and below your desired timing setting should open and close the points.
9) Set magneto stop bolt and secure magneto.
10) Install dial indicator in the other cylinder. Rotate engine to TDC. Zero dial indicator. Rotate engine backwards to desired timing setting. Open points slightly till points are opening and closing a few thousands before and after your desired timing setting.
11) Remove timing equipment. Reassemble engine. Check spark quality. Install spark plugs.
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