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Trained technicians with precision gauging and proper assembly fixtures carefully
assemble all Cobra engines to specific clearances. If you feel you have the skills,
and the appropriate tools, to perform the following service tasks please follow the
instructions closely. The part numbers are listed throughout to help you when
ordering parts from your local Cobra dealer.
If you don’t feel comfortable with the service work, simply take your engine out of
the frame and sent it to:
Cobra Precision Engines
11511 Springfield Road
North Lima, Ohio 44452
Cobra has specialized mechanics that will go through the entire engine, replacing
gaskets, bolts, any old part that is worn. The engine will be rebuilt using the
same precision gauging and assembly fixtures as when it was assembled new.
Before leaving, the engines performance will be measured on a dynamometer to
ensure that your engine is operating at its highest potential. All this for one low
nominal fee. Call (330) 549-9603 for details.
ES1: Engine Service
One method for determining whether the top end of your engine needs rebuilt is
to perform a WOT (Wide Open Throttle) kicking compression test. Before
performing the procedure please read the caution notes below.
CAUTION:
• There appears to be a wide range of variability in reading compression
gauges across the country.
• The head volume of this Cobra Motorcycle is very small and so requires many
kicks ~20 before you establish the most accurate reading possible.
• Because of the geometry of the spark plug used in this Cobra Motorcycle, the
adapter used with your compression tester must have a similar volume
protruding into the combustion chamber to establish an accurate value.
• Length of hose on the compression tester will affect the reading. The shorter
the hose length the more accurate your reading will be.
Because of these difficulties in measuring an absolute compression value, a
useful relative value can be achieved by testing your bike’s compression with
your own particular gauge after a new top end or when the bike is new so that
you know what your particular gauge reads on a ‘fresh’ engine. When it has
dropped to 90% of its original value the engine will be down on power and would
benefit from a rebuild. When it’s dropped to 80% it really needs rebuilt! Using the
table below will help you determine monitor the condition of your top end.