Suzuki DF 40 Service Manual page 36

ADJUSTMENT
Tappet clearances are adjusted by replacing tappet shim.
(1) Close valve and turn tappet cut-away toward inside as shown
in figure.
(2) Rotate crankshaft to open (lift up) the valve and then re-
move camshaft housing bolts where the shim to be re-
placed.
(3) Install special tool with camshaft housing bolts as shown in
figure.
09916-67010 : Tappet holder
NOTE:
Index mark "IN" on the tappet holder is for intake side, while
"EX" is for exhaust side.
(4) Rotate top of cam 90 degree clockwise and remove shim
from cut-away at tappet.
(Two tappets can be adjusted at the same time)
• Do not put your finger between camshaft and tappet
while the tappet is being held with the tappet holder.
• Use a magnet to remove and install shim.
• When installing shim, identification mark on the shim
must face towards tappet side.
(5) After removing shim, measure thickness of original shim and
determine correct thickness of shim for proper tappet clear-
ance as calculated by the following formula.
09900-20205 : Micrometer
A = B + (C – 0.20 mm)
A : Correct thickness of shim for proper tappet
clearance (mm)
B : Thickness of original shim (mm)
C : Original tappet clearance (mm)
PERIODIC MAINTENANCE 2-10
Cut section of tappet
Plug hole
Shim
Camshaft housing bolt
Plug hole
Magnet
Shim
Removed shim