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Assemble the top end of the engine with either; 1) the crankcase stamp
recommended base gasket or, 2) if assembling with a new set of cases
assemble with a 0.4mm (0.015”) base gasket, and torque the head nuts to the
proper torque specifications leaving off the spark plug and ignition cover (piston
rings can be left off to ease assembly).
Carefully insert the solder wire though the spark plug hole, into the cylinder far
enough such that the tip of the wire touches the left or right side cylinder wall
(not the front or back as the piston will rock more and give incorrect
measurement).
Hold the wire at this position and rotate the crankshaft, by the flywheel nut (or
kick lever) three revolutions to ‘smush’ the solder wire.
CAUTION:
If you rotate the flywheel nut in a counterclockwise direction there is a risk of
loosening the nut.
Pull out the wire and measure the solder thickness at the thinnest location near
its tip accurately with the thin tips of calipers.
Adjust base gasket thickness as necessary to get the desired value.
Upon completion, your final assembly squish clearance should agree with the chart
below
Fuel & Air System
Carburetor:
Tools recommended for carburetor service:
Small flat head screwdriver
WD-40
6mm
socket