Installing The Valves - Yamaha RAPTOR YFM125RA Service Manual

EAS24340

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
• Valve stem end
(with an oil stone)
2. Lubricate:
• Valve stem "1"
• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Engine oil
3. Install:
• Valve stem seat "1"
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Valve spring retainer "5"
(into the cylinder head)
New
5-24
VALVES AND VALVE SPRINGS
TIP
• Install the valve springs with the larger pitch
"a" facing up.
• Install the valve spring with its painted end
facing up.
b. Smaller pitch
4. Install:
• Valve cotters "1"
TIP
Install the valve cotters by compressing the
valve spring with the valve spring compressor
and the valve spring compressor attachment
"2".
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor
attachment
90890-04114
Valve spring compressor
adapter 19.5 mm
YM-04114