Yamaha ttr230 User Manual

ENGINE
INSPECTION AND REPAIR
4-26
NOTE:
Rotate the head some turns in order to avoid
excessive removal of material only on one
side.
Measurement steps:
• Apply blue mechanic paint on the valve
face.
• Install the valve on the head.
• Press the valve through the guide to the
valve seat.
• Measure the valve seat width.
• If the valve seat width is too thin or too
thick or off-center, the valve seat should
be redone.
************************************
************************************
VALVE SEAT
1. Remove:
• Carbon fouling
(from the valve and seat)
2. Inspect:
• Valve seat
Wear => Grind the seat.
3. Measure:
• Valve seat width a
Out of specification => Grind
the seat.
Valve seat width:
Intake:
0.9~1.1 mm (0.035 ~0.043 in)
Exhaust:
0.9~1.1 mm (0.035 ~0.043 in)

Yamaha ttr230 Specifications

General

Engine Type	223cc air-cooled SOHC 4-stroke; 2 valves
Bore x Stroke	70.0mm x 58.0mm
Compression Ratio	9.5:1
Ignition	CDI
Transmission	Constant-mesh 6-speed; multiplate wet clutch
Final Drive	Chain
Rear Suspension	Single shock; 8.7-in travel
Front Tire	80/100-21
Rear Tire	100/100-18
Length	81.3 in
Width	31.5 in
Seat Height	34.3 in
Wheelbase	54.5 in
Ground Clearance	11.6 in
Front Suspension	Telescopic fork
Rear Brake	Drum