Yamaha 2008 YZ250FX, Owner'S Service Manual, Page: 600 / 776

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SPECIFICHE DI MANUTENZIONE
Valvola, sede valvola, guidavalvola:
Gioco valvole (a freddo)
INT 0.10–0.15 mm (0.0039–0.0059 in) ----
EST 0.17–0.22 mm (0.0067–0.0087 in) ----
Dimensioni valvola:
Diametro testata "A" (INT) 22.9–23.1 mm (0.9016–0.9094 in) ----
Diametro testata "A" (EST) 24.4–24.6 mm (0.9606–0.9685 in) ----
Larghezza faccia "B" (INT) 2.26 mm (0.089 in) ----
Larghezza faccia "B" (EST) 2.26 mm (0.089 in) ----
Larghezza sella "C" (INT) 0.9–1.1 mm (0.0354–0.0433 in) 1.6 mm (0.0630
in)
Larghezza sella "C" (EST) 0.9–1.1 mm (0.0354–0.0433 in) 1.6 mm (0.0630
in)
Spessore margine "D" (INT) 0.8 mm (0.0315 in) ----
Spessore margine "D" (EST) 0.7 mm (0.0276 in) ----
Diametro esterno dello stelo (INT) 3.975–3.990 mm (0.1565–0.1571 in) 3.945 mm
(0.1553 in)
Diametro esterno dello stelo (EST) 4.460–4.475 mm (0.1756–0.1762 in) 4.430 mm
(0.1744 in)
Diametro interno della guida (INT) 4.000–4.012 mm (0.1575–0.1580 in) 4.050 mm
(0.1594 in)
Diametro interno della guida (EST) 4.500–4.512 mm (0.1772–0.1776 in) 4.550 mm
(0.1791 in)
Gioco tra stelo e guida (INT) 0.010–0.037 mm (0.0004–0.0015 in) 0.08 mm (0.003
in)
Gioco tra stelo e guida (EST) 0.025–0.052 mm (0.0010–0.0020 in) 0.10 mm (0.004
in)
Elemento Standard Limite