Honda GX 120 Tech Manual page 11

0.150"
0.100"
0.050"
FLYWHEEL, FAN AND IGNITION SYSTEM
Caution should be used when removing flywheel. Do not hit with hammer or other heavy objects. Service manual
show flywheel to be removed with commercially available 6" puller. Another method is inertia type knocker that
threads onto crankshaft end.
The transistorized magneto ignition is fixed at 20 degrees BTDC and may not be altered in anyway. Firing
must not exceed 0.066.5" or 20 degrees BTDC.
Quick check: Turning flywheel clockwise-if the leading edge of the depression of flywheel rim where the
magnet is mounted is not still under the right hand coil leg at 0.065" BTDC, it is probably illegal and should
be checked further. If timing needs to be checked further see page 19.
A. Flywheel keyway or its position must not be altered. Key should fit snugly in crank; if key has been altered
it is a DQ regardless of timing. White magnet flywheel and stock or offset key is DQ and 30 day
suspension.
B. Factory Key only may not be deleted or altered in any way.
C. Magnet and its position may not be altered in any way.
D. Magnet retaining screw may not be altered in any way. Screw may not be replaced with larger or smaller
screw. No heli-coiling of mounting hole.
162 ½ to 167 ATDC
180 ½ to 185 ATDC
197 ½ to 201 ATDC
0.150" 44 ½ to 47 ½
0.100" 26 to 29 ½
0.050" 9 to 12 ½
BTDC
BTDC
BTDC
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