Cobra 2009 ECX80 AC, Owner'S Manual

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42
Code Supplied Base
Gasket Thickness
Cobra #
# mm inch Part #
2 0.2 0.008 ZCMU0702
0.25 0.010 ZCMU0011
3 0.3 0.012 ZCMU0703
4 0.4 0.015 ZCKG0501
5 0.5 0.020 ZCMU0705
6 0.6 0.024 ZCMU0706
7 0.7 0.028 ZCMU0707
8 0.8 0.031 ZCMU0708
9 0.9 0.035 ZCMU0015
1 1.0 0.039 ZCMU0016
NOTE
Tolerances will affect the actual gasket thicknesses.
If during the course of the maintenance more parts than the base gasket are
changed, the squish clearance should be measured, and possibly a different
base gasket will be required.
The easiest way to measure squish clearance is with 1mm to 1.5mm thick
flexible solder wire (available through most popular electronic stores). The
process is as follows:
•
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.