Suzuki DF 25 Service Manual page 140

Camshaft runout
Using a set of V-blocks, support the camshaft on a surface plate.
Measure runout using a dial gauge.
09900-20602 : Dial gauge
09900-21304 : "V" block set
09900-20701 : Magnetic stand
Camshaft runout
Service limit : 0.10 mm (0.004 in.)
If measurement exceeds service limit, replace camshaft.
CAMSHAFT JOURNAL
Check camshaft journals and camshaft journal bores for pit-
ting, scratches, wear or damage.
If any of the above conditions are found, replace camshaft and /
or cylinder head.
Camshaft journal oil clearance
09900-20202 : Micrometer
Using a micrometer and bore gauge, measure the journal di-
ameters(O.D.) in two directions at four places, and journal bore
diameters (I.D) in cylinder head.
This produces four readings for each journal.
Subtract the journal diameter measurement from the journal
bore measurement to determine the journal oil clearance.
If the journal oil clearance exceeds the service limit, replace
camshaft and if necessary, cylinder head.
Camshaft journal oil clearance
Standard : 0.050 – 0.100 mm (0.0020 – 0.0039 in.)
Service limit : 0.160 mm (0.0060 in.)
POWER UNIT 7-23