Yamaha YP250 Mobility Scooter User Manual


 
4-8
CYLINDER HEAD
ENG
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NOTE:
NOTE:
22 Nm (2.2 mSkg)
10 Nm (1.0 mSkg)
2. Inspect:
SCylinder head
Scratches/damage ! Replace.
3. Measure:
SCylinder head warpage
Out of specification ! Resurface.
Cylinder head warpage:
Less than 0.03 mm
Warpage measurement and resurfacement
steps:
D Place a straightedge and a feeler gauge
across the cylinder head.
D Measure the warpage.
If the warpage is out of specification, resur-
face the cylinder head.
D Place a 400 600 grit wet abrasive paper on
the surface plate, and resurface the head us-
ing a figure-eight sanding pattern.
Rotate the cylinder head several times for an
even resurfacement.
YP404190
CYLINDER HEAD INSTALLATION
1. Install:
SGasket (cylinder head)
SDowel pins
SCylinder head
D Apply engine oil onto the nut threads.
D Tighten the nuts in a crisscross pattern.
2. Tighten:
SNuts (cylinder head)
SBolts (cylinder)