Honda CM400A - Valve Clearance and Cam Chain Adjustment

HONDA
CB4QOT INSPECTION AND ADJUSTMENT
VALVE CLEARANCE ADJUSTMENT
NOTE
Inspect and adjust valve clearance while
the engine
is cold. (Below 35'~. 95'~)
Remove the seat.
Turn the fuel valve "OFF" and remove the
fuel tube and fuel tank.
Remove the left crankcase cover and cylinder
head cover.
Rotate the flywheel counterclockwise and
align the rotor "T" mark with the crankcase
index mark.
Check the intake and exhaust valve clearance
by inserting the feeler gauge between the
clearance adjusting screw and the valve stem.
Before checking, make sure that the piston
is at TDC on the compression stroke. (The
rockers should be loose.)
VALVE CLEARANCE:
IN: 0.10 * 0.02 mm (0.004 i. 0.0008 in.)
EX: 0.14 t 0.02 mm (0.006 i. 0.0008 in.)
Adjust by loosening'the lock nut and turning
the screw until there
is a slight drag on the
feeler gauge.
Tighten the locknut and recheck clearance.
Rotate the flywheel counterclockwise one full
turn and align the
"T" mark with the index
mark.
Check the intake and exhaust valve clearance
for the opposite cylinder.
CAM CHAIN ADJUSTMENT
Start the engine and allow it to idle.
Loosen the cam chain tensioner lock nut.
When the cam chain tensioner lock nut
is
loosened, the tensioner will automatically
position itself to provide the correct tension.
Retighten the lock nut.
. .
Date of Issue: September, 1977
O HONDA MOTOR CO., LTD.
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