CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 31
4. Measure:
zSpring tilt
Out of specification → Replace.
Spring tilt limit:
1.7mm (2.5º)
5. Inspect:
z Spring contact face
Wear/Pitting/Scratches → Replace.
6. Measure:
zValve guide inside diameter
Out of specification → Replace.
Valve guide inside diameter:
Intake:
6.000-6.012 mm
<Limit: 6.05mm>
Exhaust:
6.000-6.012 mm
<Limit: 6.05 mm>
7. Measure:
Stem-to guide clearance=
Valve guide inside diameter-
Valve stem diameter
Out of specification → Replace the valve
guide.
Stem-to-guide clearance limit:
Intake:
0.08 mm
Exhaust:
0.10 mm
VALVE SEATS INSPECTION
1. Eliminate:
zCarbon deposits
(from the valve face and valve seat)
2. Inspect:
zValve seats
Pitting/wear → Reface the valve seat.
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