Motocross SX - 125 sx
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This is the measure of all motocross World Championship bikes with a genuine factory engine! There has never before been a bike like this for sale. Feather light and with any amount of power, the KTM 125 SX leaves ample room to correct the line and is always easy to control. With its redesigned chassis setup, new V-Force 3 membrane and a broad range of revolutions, it makes other 125 cc 2-strokes look old. And it’s only KTM that supplies high quality series details like the adjustable CNC-machined triple clamp.
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| Chassis |
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| Frame |
central double-cradle-type 25 CrMo4 |
| Subframe |
aluminum 7020 |
| Handlebar |
Renthal aluminium Ø 28/22 mm |
| Front suspension |
WP-USD Ø 48 mm (1.89") |
| Rear suspension |
WP-PDS shock absorber |
| Suspension travel front/rear |
300 / 335 mm (11.81/13.19") |
| Front / Rear brakes |
disc brakes 260 / 220 mm (10.24/8.66") |
| Front / rear rims |
1.60 x 21"; 2.15 x 19" |
| Front / rear tires |
80/100-21"; 100/90-19" |
| Chain |
chain 5/8 x 1/4" |
| Main silencer |
aluminum |
| Steering head angle |
63° |
| Wheelbase |
1471±10 mm (57.91±0.39") |
| Ground clearance (unloaded) |
390 mm (15.35") |
| Seat height |
925 mm (36.42") |
| Fuel capacity |
approx. 7.5 litres (2 gal) |
| Weight (ready to race, no fuel) |
approx. 92.4 kg (203.7 lbs) |
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| Engine |
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| Engine Type |
single cylinder, 2-stroke |
| Displacement |
124.8 cc |
| Bore / stroke |
54 / 54.5 mm (2.13 / 2.15") |
| Compression ratio |
- |
| Starter |
kick-starter |
| Transmission |
6 gears |
| Carburetor |
Keihin PWK 39 |
| Power Valve Control |
TVC power valve |
| Lubrication |
mixture oil lubrication 1:40 |
| Transmission lubrication |
Motorex Top Speed 15W50 |
| Engine oil |
- |
| Primary ratio |
23 : 73 |
| Final drive |
13 : 50 |
| Cooling |
liquid cooled |
| Clutch |
wet multi-disc clutch, operated hydraulically |
| Ignition |
Kokusan digital 2K-1 |
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View KTM accessories | View the KTM website >>
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