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Adjustment of the Contact Points

After 5000 or 6000 miles of running the contact points on the magneto may require adjustment. However, if the motor is firing regularly, it is advisable to leave the magneto alone.

A Bosch magneto wrench will be found in the tool kit of all machines with which the Bosch magneto is furnished. The contact points may be set closer by loosening the nut "7" (illustration 18) and then turning the hexagon headed adjusting screw "6" until the distance "5" between the points "3" and "6" is just enough to permit the steel feeler gauge attached to the Bosch magneto wrench to be inserted. This separation is about 1/50 inch. This adjustment must be made when the arm "2" is on the center of the interrupter cam "1" or "9." It may be necessary to crank the motor to get the arm in the correct position for making the adjustment. After the points are the proper distance apart, carefully tighten the nut "7."

Tight Interrupter Housing

Now and then a rider may find that the interrupter housing gets tight. This is generally due to extensive travel through heavy dust or mud. The trouble can be remedied by thoroughly cleaning the housing with gasoline, and then applying a drop of oil.

Testing a Magneto for Trouble

If magneto trouble is suspected, turn the left grip all the way to the right, thereby fully advancing the spark; then disconnect the cable from the spark plug and support its terminal 1/8 inch from the metal of the engine, and work the starter pedal briskly. If sparks do not appear, examine the interrupter to see that the contact points at "3" and "6" are clean and that the interrupter lever "2" moves freely.

Due to climatic conditions, the interrupter lever may stick or work stiffly. This can be remedied by removing the lever and polishing the steel pin and fibre bushing to make the lever work properly again. When polishing this stud, polish it only as much as is necessary, because the lever may not be loose enough to shake in the bushing.

If the magneto still fails to spark regularly, examine the brushes, brush holders, and collector spool. The brushes are to be examined for wear and

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