Yamaha ttr230 User Manual

ENGINE
INSPECTION AND REPAIR
4-37
• Determine the cylinder – piston clearance
using the following formula:
2. Place:
• Cylinder ring
NOTE:
Remove the carbon fouling from the piston
grooves and rings before measuring the
clearance.
1. Measure:
• Side clearance
Out of specification => Replace piston
and rings.
PISTON RINGS
************************************
• If out of specification, grind or replace
cylinder, piston, and rings.
Cylinder – piston clearance:
0.035~0.055 mm
<limit>: 0,15 mm
Side clearance
Top ring:
0.03~0.07 mm
Secondary ring
0.02~0.06 mm
Cylinder – piston clearance =
Cylinder diameter “C”
-
Piston skirt diameter “P”
NOTE:
Use the piston head and the guide to place
the ring on the cylinder parallel to the base.

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