Yamaha ttr230 User Manual

ENGINE
INSPECTION AND REPAIR
4-39
CRANKSHAFT
Clearance
2. Check:
• Primary gear 1
Wear/damages => Replace crankshaft.
• Crankshaft roller bearing 2
Abnormal noise / Slow rotation /
clearance =>
Replace crankshaft.
3. Check:
• Crankshaft roller bearing 1
Abnormal noise / Slow rotation /
clearance =>
Replace crankshaft.
• Connecting-rod deflection F
Out of specification => Replace
connecting-rod.
• Connecting-rod side clearance D
Out of specification => Replace rollers.
on connecting-rod, crankshaft pin and/or
connecting-rod.
• Warping C
Out of specification => Replace crankshaft
and/or roller bearings.
1. Measure:
• Crankshaft width A
Out of specification => Replace
crankshaft.
Crankshaft width:
55.95~56.00 mm
Warping limit:
0.03 mm
Connecting-rod side clearance:
0.35~0.65 mm
Connecting-rod deflection:
0.8 mm
2
1
Radial
Vertical
1

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