Honda GX 120 Tech Manual page 19

PROCEDURE FOR CHECKING TIMING
A. With degree wheel or indicator located at 0 degrees or TDC., mark both the flywheel and some fixed point
(such as right hand side of aluminum block casting right above flywheel) with aligning marks. Turn the
flywheel clockwise and stop at 26 degrees BTDC or 0.103" - 0.104" BTDC on your indicator. Make another
mark on the block casting that aligns with your mark on the flywheel.
B. Remove dial indicator so it will not be damaged by engine rotation.
C. Install timing light to a battery, if not self powered, and clamp inductive pickup to spark plug wire. Wire
should be hooked to standard spark plug gapped to 0.025". Using a drill, with an extension that is cut off or
turned to fit drill, place socket on flywheel nut and rotate engine in clockwise direction.
D. Fire the timing light and observe. If the reference mark on the flywheel is between the two marks on block
casting that are TDC and 0.104" or 26 degrees BTDC, the timing is legal. If mark is not between marks on
block casting when rotating, the engine will be disqualified.
Other pictures and text indicate methods of detecting which particular part is not in spec.
Tech officials have the right to tech any or all cars in any class at their
discretion. Tech Officials follow the same chain of command as all officers of
QMA – as follows: Local – Regional – National I.E. Regional tech officials
can tech at any event at their region and National Tech Officials can tech at any
event in QMA. National Tech Director is final authority on all tech issues.
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