Specifications

70
30
Before putting the dust cover back on the points box, clean
the points by sliding lint free paper back and forth between
the contacts. Manually, open the points when removing
the paper to eliminate paper fibers from remaining between
the contact points (diag. 27).
Fixed Timed System (External coil)
This system has the contact points and condenser mounted
under the flywheel with the laminations and coil mounted
outside the flywheel. This system is identified by the square
hole in the stator, the round configuration of the coil, and
on older coils, the word "Grey Key" is stamped on the coil
to identify the proper flywheel key to be used. When
ordering an external coil for replacement from Tecumseh
Products, a solid state module will be received as a
replacement. The new module will be supplied with the
proper flywheel key (diag. 28).
Torque down the stator bolts to secure the stator in place.
Next, rotate the crankshaft until the point arm is resting on
the high side of the ignition cam. Set the point gap at .020"
(.508 mm), by loosening the screw on the movable point,
and insert a .020" (.508 mm) feeler gauge between the
contact points (diag. 29). Tighten the screw on the movable
point and then recheck the point gap. Be sure to clean
contact points with lint free paper (diag. 27).
NOTE: The flywheel key used on engines with an external
coil and points looks similar to the solid state key, however,
timing will be effected if the wrong key is used.
Reinstall the proper flywheel key, flywheel, washer and
torque down the flywheel nut to specification. Reinstall the
external coil and set the proper air gap to .0125" (.3175
mm) using air gap gauge, part # 670297 between the
magnets and laminations and torque the mounting screws
to specification. Remove the air gap gauge and rotate the
flywheel to check for any possible striking points. If none
are found, the air gap is set correctly and the timing
procedure is completed (diag. 30).
Solid State Ignition Timing
Timing is set using a .0125" (.3175 mm) air gap gauge
(Part No. 670297). Loosen the two hold-down screws, insert
the .0125" (.3175 mm) remove semi-color gauge between
the laminations and the magnet on the flywheel. Slide the
solid state ignition assembly against the air gap gauge
and the flywheel magnet. Torque the two hold down screws
to the correct specification and remove the air gap gauge.
Rotate the flywheel one full revolution to check for any
possible striking points. If none are found, the air gap is
set correctly and the timing procedure is completed (diag.
30).
28
29
27
LINT FREE PAPER
.0125
(.3175 mm)