Yamaha MX250 - Engine Speed

2-13
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2
3
4
5
6
7
8
9
10
PERIODIC CHECKS AND ADJUSTMENTS
PERIODIC MAINTENANCE
c. Tighten the locknut “1”.
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6.
Install:
• Cylinder head cover gasket
• Cylinder head cover
• Breather hose
• Spark plug
• Spark plug cap
ENGINE SPEED
1.
Warm up the engine for several minutes.
2.
Attach:
• Digital tachometer “1”
3.
Measure:
• High engine speed (with no load)
Out of specification  Adjust.
Adjuster Valve clearance
Turn clockwise Decrease
Turn counterclockwise Increase
Valve adjuster locknut:
7 N·m (0.7 kgf·m, 5.2 lb·ft)
Cylinder head cover bolt:
11 N·m (1.1 kgf·m, 8.1 lb·ft)
Spark plug:
20 N·m (2.0 kgf·m, 15 lb·ft)
T
R
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New
T
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T
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1
Digital tachometer:
YU-39951-B, 90890-06760
High engine speed:
3750–3850 r/min