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Take
a piece of thin solder (.030 - .040) and bend a
small L in the end.
Remove the glow plug.
Then place the end with the L into the glow put
hole. You want the tip of the L to hit the cylinder
wall and then turn the engine over. The top of the
piston will press the solder into the cylinder head
and flatten the solder.
Carefully pull the flatted solder out of the motor.
Then measure the thickness for the flattened solder
with calipers.
To adjust the head clearance, remove the head and
button.
Now add or remove the appropriate brass shims to
get the head clearance you are looking for.
Put the button and head back on, make sure you tighten
the screw evenly and double-check the head clearance.
Run most motors between .017 and .022.
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