Yamaha ttr230 User Manual

ENGINE
4-31
INSPECTION AND REPAIR
1. Measure:
• Free length a
Out of specification => Replace.
VALVE SPRING
NOTE:
• Replace the guide and retainers whenever
the valve is replaced.
5. Measure:
• Thickness a
Out of specification => Replace.
6. Measure:
• Warping (valve stem)
Out of specification => Replace.
Thickness:
0.8-1.2 mm (0.031 ~ 0.047 in)
Warping:
Less than 0.010 mm
Spring free length:
Internal External
36.17 mm 36.63 mm
36.17 mm 36.63 mm
Intake
Exhaust
a

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