Yamaha VMX12 2001, Service Manual

Page: 31 / 454

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SPEC
ENGINE SPECIFICATIONS
Spring tilt
Intake ---- 2.5° /1.8 mm
Exhaust ---- 2.5° /1.8 mm
Winding direction (top view)
Intake Clockwise ----
Exhaust Clockwise ----
Cylinders
Cylinder arrangement V-type 4-cylinder ----
Bore
×
stroke 76
×
66 mm ----
Compression ratio 10.5 : 1 ----
Bore 75.967 ~ 76.016 mm ----
Max. taper ---- 0.05 mm
Max. out-of-round ---- 0.05 mm
Pistons
Piston-to-cylinder clearance 0.055 ~ 0.075 mm 0.15 mm
Diameter D 75.905 ~ 75.955 mm ----
Height H 6.2 mm ----
Piston pin bore (in the piston)
Diameter 19.004 ~ 19.015 mm ----
Offset 0 mm ----
Piston pins
Outside diameter 18.991 ~ 19.000 mm ----
Piston-pin-to-piston-pin-bore clear-
ance 0.004 ~ 0.024 mm 0.072 mm
Item Standard Limit
H
D