CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 22
CYLINDER HEAD INSPECTION:
1. Eliminate:
zCarbon deposits
(from combustion chambers)
Use a rounded scraper.
NOTE:
Do not use a sharp instrument to avoid
damaging or scratching:
zSpark plug threads
zValve seats
2. Inspect:
zCylinder head
Scratches/damage → Replace.
3. Measure:
zCylinder head warpage
Out of secification → Resurface .
Cylinder head warpage :
Less than 0.03 mm
Warpage measurement and resurfacement
steps:
zPlace a straight edge and a feeler gauge
across the cylinder head.
zMeasure the warpage.
If the warpage is out of specification, resurface
the cylinder head.
z Place a 400 ~ 600 grit wet abrasive pape on
the surface plate, and resurface the head using
a figure eight sanding patten.
NOTE:
Rotate the cylinder head several times for an
even resurfacement.
CYINDER HEAD INSTALLATION
1. Install:
zGasket (cylinder head) NEW
zDowel pins
zCylinder head
NOTE:
zApply engine oil onto the nut threads.
zTighten the nuts in a crisscross pattern.
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