Cam Chain Adjustment - Honda CB350 Repair Manual

and repeat the procedure for the other
cylinder.
5. Compression may vary according to
the gauge tolerance, etc. However, both
cylinders should be within 15 psi of one
another and close to the standard specifi—
cation of 170 psi.
6. If compression is too low, squirt a
small quantity of motor oil into the cylin—
der and repeat the test. If compression
does not increase, suspect worn, dam—
aged, or improperly adjusted valves. If
the compression does increase, the pis—
ton rings are worn, probably to the point
where they should be replaced.
7. If compression seems to increase
over a period of several tune—ups, the pis—
ton crown and combustion chamber are
becoming carboned up and probably
should be decarbonized.
8. If compression drops a significant
amount over a period of several tune—ups,
it is probable that some mechanical dam—
age is being done, possibly a leaking air
filter causing wear to the piston rings and
cylinder, or lack of lubrication affecting
any of the top end components.
Cam Chain Adjustment
NOTE: Early 350 models were
equipped with an automatically—
adjusting, hydraulic—type cam chain
tensioner. No adjustment is possible.
These early units can be replaced with
the improved adjustable units found
on later models with no internal
engine modification.
350 MODELS
1. Remove the left exhaust valve cover
and the alternator cover. Remove the
spark plugs.
2. Turn the engine over coun—
terclockwise using the rotor bolt until the
left exhaust valve just begins to open,
then turn the engine in the opposite di—
rection (clockwise) to 90° after the top
dead center (ATDC) for the left cylinder.
Refer to the accompanying illustration.
3. Loosen the locknut on the tensioner
setting bolt and back the setting bolt out a
few turns, the tensioner will automati—
TUNE—UP 2D
Stator
Indexg\ p
Co
¥,
The engine is properly set up for cam chain adjust—
ment when the left piston is 90° past TDC ofits
compression stroke, as indicated by the action of
the valves and the position of the alternator rotor
marks
a " Af a
Adjusting the cam chain (350)
cally adjust itself. Tighten the setting bolt
and locknut.
360 MODELS
1. Remove the stator cover andthe left
cylinder valve tappet covers. Remove the