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37
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.
Figure 21
Code Supplied
Base
Gasket Thickness
Cobra #
# mm inch
0.15 0.006
ZCC60116
3- 0.25 0.010
ZCC60110
4 0.4 0.015
ZCC60115
5 0.5 0.020
ZCC60015
8 0.8 0.031
ZCC60130
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: