E

Head Dia

Face Width

Seat Width et

Face Width

Seat Width

Margin Thickness

"B" Face Width

"C" Seat Width

"D" Margin Thickness Limit

Stem Outside Diameter

Guide Inside Diameter

Clearance

39.9 — 40.1 mm (1.571-1.579 in) 33.9 - 34.1 mm (1.335-1.343 in) 2.26 mm (0.09 in) 2.26 mm (0.09 in) 1.2-1.4 mm (0.047-0.055 in) 1.2-1.4 mm (0.047 - 0.055 in)

1.0-1.4 mm 0.8-1.2 mm 6.975 - 6.990 6.955-6.970 7.000-7.012 <7.5 mm (0. 7.000 - 7.012 <7.5 mm (0. 0.010-0.037

(0.039 - 0.0551 in) (0.0315 - 0.0472 in) mm (0.2746 - 0.2752 in) mm (0.2738 - 0.2744 in) mm (0.2756 - 0.2761 in) 295 in) >

0.030 - 0.057 mm (0.00118-0.1 mm (0.004 in) 0.1 mm (0.004 in)

Stem Runout Limit

Valve Seat Width Standard

Valve Seat Width Standard

SPEC

Model

YFM350XA

Valve Spring: Free Length Inner Spring

Outer Spring

Set Length (Valve Closed) Inner Spring

Outer Spring

39.9 mm (1.571 in) 39.9 mm (1.571 in) 43.27 mm (0.587 in) 43.27 mm (0.587 in)

33.6 mm (1.323 in) 33.6 mm (1.323 in) 36.6 mm (1.441 in) 36.6 mm (1.441 in)

Tilt Limit* Inner Spring Outer Spring

2.5° or 1.6 mm (0.0630 in) 2.5° or 1.6 mm (0.0630 in)

Direction of Winding (Top view)

Inner Spring

Left

Left

Outer Spring

Right

Right

Piston:

Piston Size "D" Measuring Point "H"

Piston Clearance

Oversize 2nd 4th

Piston off-set Piston off-set Direction Inside Diameter (Piston pin bore) Outside Diameter (Piston pin)

(From bottom line of piston skirts)

(0.00157-0.00236 in)

Intake side

19.004-19.015 mm (0.75 in) 18.990-18.995 mm (0.75 in)

Model

YFM350XA

Piston Ring: Sectional Sketch Top Ring

2nd Ring Oil Ring

Barrel

End Gap (Installed)

Side Clearance

Top Ring 2nd Ring Oil Ring Top Ring 2nd Ring

0.20 - 0.40 mm (0.00787-0.0157 in) 0.20-0.40 mm (0.00787-0.0157 in) 0.30-0.90 mm (0.012 - 0.035 in) 0.04-0.08 mm (0.00157 - 0.00315 in) 0.03 -0.07 mm (0.00118 - 0.00276 in)

Crankshaft:

Crank Width "A"

Big End Side Clearance "B"

Runout Limit "C"

Small End Free Play Limit "F"

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