Specifications

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: