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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
#
mm
3-
0.25
4
0.4
5
0.5
8
0.8
NOTE
Tolerances will affect the actual gasket thicknesses.
Figure 21
inch
0.010
0.015
0.020
0.031
37
Cobra #
Without silicone bead
ZCC60110
ZCC60115
ZCC60015
ZCC60130
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