Suzuki DF 25 Service Manual page 142

ROCKER ARM / SHAFT
Rocker arm and adjusting screw
• If the tip of adjusting screw shows excessive wear, replace
the screw.
• The arm must be replaced if its cam-riding face is badly worn.
Rocker arm shaft runout
Using a set of V-blocks, support the rocker arm shaft on a sur-
face plate.
Measure runout using a dial gauge.
09900-20602 : Dial gauge
09900-20701 : Magnetic stand
09900-21304 : Steel "V" block set
Rocker arm shaft runout
Service limit : 0.12 mm ( 0.005 in.)
If measurement exceeds service limit, replace rocker arm shaft.
Rocker arm shaft to rocker arm clearance [ IN & EX ]
Using a micrometer and bore gauge, measure rocker arm shaft
outside diameter and rocker arm inside diameter. The differ-
ence between the two readings is the rocker arm to arm shaft
clearance.
09900-20205 : Micrometer
If measurement exceeds service limit, replace shaft or arm, or
both.
Rocker arm shaft to rocker arm clearance (IN & EX)
Standard : 0.012 – 0.045 mm (0.005 – 0.0018 in.)
Service limit : 0.090 mm ( 0.0035 in.)
Rocker arm shaft outer diameter (IN & EX)
Standard : 15.973 – 15.988 mm ( 0.6289 – 0.6294 in.)
Rocker arm inside diameter
Standard : 16.000 – 16.018 mm ( 0.6299 – 0.6306 in.)
POWER UNIT 7-25