49
Procedure for Compression Testing
1. Shut off the fuel petcock.
2. Install the compression gauge into the spark plug hole.
3. Hold the throttle to wide open, and kick repeatedly (approximately 20 times)
or until the gauge reading does not increase in value with each kick.
Base Gasket Selection
Tools required
17mm wrench
1mm flexible solder material
measurement calipers
When rebuilding the ‘top end’ of your Cobra
motorcycle, care must be taken to ensure the
proper squish clearance. Squish clearance is
defined as the minimum distance between
cylinder head and piston at TDC, and there are
negative effects of either having too much or too
little clearance. Since parts like the crank,
connecting rod, cylinder head, piston, and
crankcases all have varying tolerances, Cobra
offers several different base gasket thickness’ to
ensure that you can always set the squish
clearance of your engine to factory
specifications.
For base gasket replacement use the code (see
figure 21 for location) along with the table on the
following page reorder the correct thickness
gasket.
Code
Supplied Base
Gasket Thickness
Cobra #
# mm inch Part #
2 0.2 0.010 ZCMU0102
3 0.3 0.012 ZCMU0103
4 0.4 0.015 ZCMU0104
5 0.5 0.020 ZCMU0105
6 0.6 0.024 ZCMU0106
7 0.7 0.028 ZCMU0107
8 0.8 0.031 ZCMU0108
NOTE: Tolerances will affect the actual gasket thicknesses.
Figure 21
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