| MODEL | BETA RR 390 4T ENDURO 2015 |
| Year | 2015 |
| Engine Type | Four stroke, single cylinder with countershaft, DOHC, 4 valve |
| Displacement / Capacity | 385.6 cc / 23.5 cu in |
| Bore X Stroke | 88 x 63.4 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled, forced by pump |
| Max Power | — |
| Max Torque | — |
| Ignition | AC-CDI, Kokusan |
| Induction | Keihin FCR-MX 39 |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | Forced, 2 oil pumps |
| Gear Box | 6 Speed |
| Clutch | Wet multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Molybdenum steel with double cradle split above exhaust port |
| Front Suspension | 48 mm Sachs USD fork, adjustable compression and rebound, TFX technology, 290 mm / 11.4 in travel |
| Rear Suspension | Sachs shock with adjustable rebound and hi/low speed compression, 290 mm / 11.4 in travel |
| Front Brakes | Single wave 260 mm floating disc, 2 piston floating caliper |
| Rear Brakes | Single 240 mm disc, 1 piston floating caliper |
| DIMENSION SPECS | |
| Overall Length | 2180 mm / 85.8 in |
| Overall Width | 807 mm / 31.8 in |
| Overall Height | 1270 mm / 50.0 in |
| Seat Height | 940 mm / 37.0 in |
| Wheelbase | 1490 mm / 58.7 in |
| Ground Clearance | 320 mm / 12.6 in |
| Dry Weight | 112 kg / 247 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90 -21 |
| Rear Tyre | 140/80 -18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8.0 Litres / 2.1 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The carburetted 390 sat in the middle of the 2015 four-stroke RR range as a fast, versatile all-rounder. Updates over the previous year included die-cast engine cases, a new crank, rod, head and piston, revised fork and shock internals, a race-style handlebar pad and softer seat foam.
