16 ENGINE 127
304538-10
– Measure the piston at the piston skirt, at right angles to the piston pin, at a
distance B.
Guideline
Distance B 9 mm (0.35 in)
Piston - diameter 57.963… 57.975 mm (2.282…
2.28248 in)
16.4.14 Checking the piston/cylinder mounting clearance (125 Duke)
304550-10
– Check/measure the cylinder. ( p. 125)
– Check/measure the piston. ( p. 126)
– The piston/cylinder mounting clearance is the result of the cylinder bore diameter
minus the piston diameter.
Guideline
Piston/cylinder - mounting clearance
New condition 0.031… 0.050 mm (0.00122…
0.00197 in)
Wear limit 0.08 mm (0.0031 in)
16.4.15 Checking the oil pump (125 Duke)
304531-10
– With special tool 1, check the play between the internal rotor and external rotor
and between the external rotor and the oil pump housing.
Feeler gauge (59029041100) ( p. 253)
Oil pump
Play between external rotor and
internal rotor
0.10… 0.20 mm (0.0039…
0.0079 in)
Oil pump
Play between external rotor and oil
pump housing
0.09… 0.20 mm (0.0035…
0.0079 in)
» If the play exceeds the specification:
– Change the oil pump and, if necessary, the oil pump housing.
304532-10
– Check axial play A of the oil pump.
Oil pump
Axial play 0.10… 0.25 mm (0.0039…
0.0098 in)
» If the play exceeds the specification:
– Change the oil pump and, if necessary, the oil pump housing.
16.4.16 Checking the oil pressure regulator valve (125 Duke)
304533-10
– Remove washer 1.
– Remove spring 2.
– Measure the length of spring 2.
Oil pressure regulator valve - minimum
spring length
26.00 mm (1.0236 in)
» If the measured length is less than the specification:
– Change the spring.
– Check control piston 3 for damage and wear.
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