Engine
| Engine Type |
air-cooled, 4-stroke, single |
| Displacement |
123.7cc |
| Compression Ratio |
10.0:1 |
| Bore and Stroke |
54.0mm x 54.0mm |
| Valve Train |
SOHC; two-valve |
| Valve Clearance |
| IN: | 0.08 | ~ | 0.12 mm |
| EX: | 0.10 | ~ | 0.14 mm |
|
| Lubrication System |
Forced lubrication wet sump |
| Starting System |
Electric/Kick |
| Carburetor Type |
Mikuni VM20SS
20mm; 105 main, 15 pilot |
| Transmission Type |
5-speed |
| Clutch Type |
Wet, Multi-disc, Cable-actuated |
| Final Drive System |
428 O-ring chain, 122 links, 1.4-2.0 in slack. |
| Front / Rear Sprockets |
13 / 54 (3.857) |
| Sparkplug |
NGK CR7HSA (0.6-0.7 mm gap) |
| Battery |
GT4L-BS (12V/3.2AH) |
Suspension/Tires
| Front Tire | 70/100x19 |
| Rear Tire | 90/100x16 |
| Brakes | 220mm Disc / 110mm Drum |
| Rake/Trail | 28.5°/107 mm |
| Forks |
KYB 30mm Telescopic fork; 7.1-inch (180mm) travel; 0.332 kg/mm spring |
| Shock |
Shock with adj. rebound & comp.; 6.3, 6.6-inch (168mm) travel |
|
Dimensions
| Overall Length | 74.2 in |
| Overall Width | 31.3 in |
| Overall Height | 42.7 in |
| Seat Height | 31.7 in |
| Wheelbase | 50 in |
| Ground Clearance | 11.6 in |
| Dry Weight | 198.4 pounds |
Capacities
| Fuel Tank | 1.74 gallons, 0.5 gal. reserve |
| Engine Oil | 1.0/1.2 L |
| Fork Oil | 5.34 oz, 125mm, 10W |
Performance
| Torque | 7.3 ft-lbs. @ 6,500 rpm |
| Horsepower | 9.65 @ 8,000 rpm (crank) |
♦ Modifications
Tweaks, parts and misc. info on what I happen to use.
External Links:
♦ thumpertalk.com - TTR Forum
♦ yamaha-motor.com - Straight form the source.
♦ yamaha-motor.com - View or buy service manuals
♦ thumpertalk.com - ttr125 FAQ
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