Cobra 2007 King 50 Service Manual page 45

8 0.8
9 0.9
1 1.0
NOTE
Tolerances will affect the actual gasket thickness'.
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 engine without a base gasket 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 cylinder wall against one
side or the other (not the front or back as the piston will rock and give
incorrect measurement).
• Hold the wire at this position and turn the crankshaft, by the flywheel nut,
clockwise (counter clockwise can loosen the flywheel nut) one revolution to
'smush' the solder wire.
• Pull out the wire and measure the solder thickness, approximately 2mm from
the end of the tip, accurately with calipers.
• Compare your measurement with the chart below and install the
recommended base gasket.
Measured Solder
Thickness With
NO GASKET
(mm) (inch)
* *
0 0
0.1 0.004
0.2 0.008
0.3 0.012
0.4 0.015
0.5 0.020
0.55 0.022
0.6 0.024
0.031 ZCMU0708
0.035 ZCMU0709
0.039 ZCMU0710
Required Gasket
Thickness
(mm)
* *
0.81 0.032
0.71 0.028
0.61 0.024
0.51 0.020
0.41 0.016
0.31 0.012
0.26 0.010
0.21 0.008
Cobra Part Number
With silicone bead
*
ZCMU0708
ZCMU0707
ZCMU0706
ZCKG0501 (new)
ZCMU0704
ZCMU0703
ZCMU0702
44
ZCMU0012
ZCMU0015
ZCMU0016
Without
silicone bead
*
ZCMU0012
ZCKG0501
(old)
ZCMU0011