Linhai 2004 ATV 260, Service Manual

Page: 133 / 362

CHAPTER 3B ENGINE 50cc/80cc
ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 15 -
Check contact place of valve seat.
Polish by 30°chamfered cutting tool if the
contact place is too low.
Trim to assigned width by 45°chamfered
cutting tool.
Polish valve contact surface with emery and
polishing bar after correcting bar.
Wash and clean cylinder and valve after
polishing and grinding.
·
Rotate and press softly, when polishing
·
Don’t put emery into valve and valve
guide pipe when polishing
Spread red inkpad on 45° seat surface and
confirm if the centre of contact surface of
valve is even after correcting.
Building-up of cylinder head
Build up spring seat
Use new oil seals when reassembling.
Spread engine oil on valve stem and put into
valve guide.
Build up inner and outer valve spring and put
in valve collar using spring compressor.
Use Valve spring compressor accessorily to
make valve contact with valve collar.
Use plastic mallet to beat edge on ends of
valve to seat collars two or three times softly.
When using mallet be careful not to
damage valves.