Yamaha SRX440 1980 Service Manual page 15

1980 SRX440
Ring end gap free:
Approx. 7.0 mm (0.28 in)
Piston clearance:
Minimum " .. 0.065 mm (0.0026 in)
Maximum 0.070 mm (0.0028 in)
e. Wash piston in solvent and wipe dry.
f. Measure the outside diameter of the
piston at the piston skirt.
Measurement should. be made at a
point 10 mm (0.5 in) above the bot-
tom edge of the piston. Place the
micrometer at right angles to the piston
pin.
Piston maximum diameter subtracted
from minimum cylinder diameter gives
1. 10 mm (0.5 in)
10. Piston ring inspection
a. Check rings for scoringlany severe
scratches are noticed, replace ring set.
b. Measure ring end gap in free position. If
beyond tolerance, replace ring set.
-----nrme-cylindel tbtblelallce
01
bOle to
next oversize and fit oversize piston.
c. Carefully remove carbon deposits from
ring grooves with filed end of ring.
d. Remove score marks and lacquer de-
posits from sides of piston using 600 ~
800 grit wet sandpaper. Sand in a cris-
scross pattern. Do not sand excessively.
e. The piston pin should have no notice-
able free play in the piston. If the piston
pin is loose, replace the pin and/or
piston.
9. Piston inspection
a. Remove piston rings.
b. Remove carbon deposits from piston
crown.
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