ines M192M / M191M / M245M / M234M / M282M / M281M
3.6.15. GUDGEON PIN DIAMETER
• Check gudgeon pin outside diameter (A).
Diameter (A) (Engines M192M / M245M / M281M / M234M /
M282M) (125 - 200 cc): Ø 14,996 ÷ 15,000 mm
Diameter (A) (Engine M191M) (150 cc): Ø 14,994 ÷ 15,000
mm
• Check gudgeon pin small end clearance.
Standard clearance: 0.015 ÷ 0.029 mm
• Measure thrust surface diameter on piston.
Standard diameter: Ø 15.001 ÷ 15.006 mm
• Calculate gudgeon pin-piston clearance.
Standard clearance: 0.001 ÷ 0.010 mm
NOTE Gudgeon pin seats have lubrication ducts. Take di-
ameter reading along piston axis.
• Measure piston outer diameter (B1 and B2) at right an-
gles to the gudgeon pin axis.
• Take reading in the position shown in the figure:
C1=: (Engines M245M / M281M) (125 cc): 41,1 mm (from
piston crown)
C1=: (Engine M192M / M191M) (125 - 150 cc): 36,5 mm
(from piston crown)
C2=: (Engines M234M / M282M) (200 cc): 5 mm (from piston
base)
B1= diameter (Engines M192M / M245M / M281M) (125 cc):
Ø 56.945 ÷ 56.973 mm
B1= diameter (Engine M191M) (150 cc): Ø 56.933 ÷ 56.961
mm
B2= diameter (Engines M234M / M282M) (200 cc): Ø 68.933
÷ 68.961 mm
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