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I am seeking asssitance in installing points for a 1974 Yamaha LT100

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It is pretty easy. Remove the old points then install the new set. There is a slot where the lockdown screw goes. The slot limits the adjusting range yet allows the adjusting plate to move left and right to set the timing. The lockdown screw gets snugged up just enough to hold the points assembly in place so you can stick a screwdriver inside the flywheel and into the adjusting point to move the entire points assembly. Moving the sssembly makes the timing earlier or later. A dial gage is screwed into the spark plug hole to gage the position of the piston. The timing should be set such that the points open at 1.8mm BTC.. An ohlm meter will show you the moment the points break contact. You can check the timing with a timing light if your particular machine has an index mark on the flywheel and a static mark on the case. Not everyone has a dial gage, Ohlm meter and timing light. In general, set the points gap at .012 to .015 and you should be about right. The gap is set with the arm riding on the high point of the magneto center lobe. Please take a moment and rate my answer. Thanks.

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Posted on Aug 04, 2010

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