Yamaha ttr230 User Manual

ENGINE
INSPECTION AND REPAIR
4-38
3. Measure:
• Inter-tip gap
Out of specification => Replace.
3. Measure:
• Internal diameter of the piston pin hole
Out of specification => Replace.
PISTON PIN
NOTE:
It is not possible to measure the inter-tip
gap of the oil ring expander. If the grooved
rails of the oil ring have an excessive
clearance, replace the 3 rings.
1 Micrometer
1. Check:
• Piston pin 1
Blue color/scratches => Replace and
inspect the lubrication system.
2. Measure:
• External diameter of the piston pin
Out of specification => Replace.
Inter-tip gap:
Compression ring (top):
0.15~0.30 mm
Scraper ring (secondary):
0.15~0.30 mm
Oil ring:
0.30~0.90 mm
External diameter of the piston pin
15.991~16.000 mm
Internal diameter of the piston pin
hole (on the piston):
16.002~16.013 mm

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