Yamaha WR250F Owner's Service Manual

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Contents

2-11TIGHTENING TORQUESTIGHTENING TORQUESENGINE△ - marked portion shall be checked for torque tightening after break-in or before each race.Rectifier/regulator:Regulator type Semiconductor short circuit ----Model/manufacture SH770AA/SHINDENGEN ----Regulated voltage (AC) 12.5–13.5 V ----Regulated voltage (DC) 14.0–15.0 V ----Rectifier capacity (AC) 12 A ----Rectifier capacity (DC) 8 A ----Electric starting system:Type Constant mesh ----Starter motor:Model/manufacturer 5UM01/YAMAHA ----Operation voltage 12 V ----Output 0.35 kW ----Armature coil resistance 0.0189–0.0231 Ω at 20 °C (68 °F) ----Brush overall length 7 mm (0.28 in) 3.5 mm (0.14in)Brush quantity 2 pcs. ----Spring force 3.92–5.88 N (400–600 g, 14.1–21.2 oz) ----Commutator diameter 17.6 mm (0.69 in) 16.6 mm (0.65in)Mica undercut (depth) 1.5 mm (0.06 in) ----Starter relay:Model/manufacturer 2768090-A/JIDECO ----Amperage rating 180 A ----Coil winding resistance 4.2–4.6 Ω at 20 °C (68 °F) ----Starting circuit cut-off relay:Model/manufacturer ACM33221 M38/MATSUSHITA ----Coil winding resistance 75.69–92.51 Ω at 20 °C (68 °F) ----Fuse (amperage×quantity):Main fuse 10 A × 1 ----Reserve fuse 10 A × 1 ----Item Standard LimitPart to be tightened Thread size Q'ty Tightening torqueNm m•kg ft•lbSpark plug M10S × 1.0 1 13 1.3 9.4Camshaft cap M6 × 1.0 10 10 1.0 7.2Cylinder head blind plug screw M12 × 1.0 1 28 2.8 20Cylinder head (stud bolt) M6 × 1.0 2 7 0.7 5.1Cylinder head (stud bolt) M8 × 1.25 1 15 1.5 11Cylinder head (bolt) M9 × 1.25 4 38 3.8 27Cylinder head (nut) M6 × 1.0 2 10 1.0 7.2Cylinder head cover M6 × 1.0 2 10 1.0 7.2