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Overview:
The 4-Stroke line-up of RR models features four different-sized engines all based on the same platform yet with different bores and strokes which provide a different riding experience. From the flickable, free-revving 350 all the way up to the torque of the 480, riders of all abilities will find the Rideability of the Beta 4-stroke RR models refreshing.
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Features: Off-Road Light & Meter Package, Easy Access Air Filter Box Dual Map Selection, Sachs ZF Forks with Tool-Less Adjustability, Smooth 4-Stroke Power Delivery, On-Demand Traction Control, EFI with Twin Injectors, Quick Release Seat Removal, New Seat Design with Softer Foam, New Lighter & Durable Radiator with more Fork Clearance for Greater Turning Radius
Radiator Shrouds
The new shrouds are narrower than before to give the rider more freedom of movement, especially when cornering. Designed to be sleed and also contribute to the revised, simple, and essential new look of the bike.
Engine Maps
Advanced electronics take full advantage of the increased torque at low to medium engine speeds made available by the new exhaust header. Four stroke models now feature dedicated new engine management maps that spread the power curve out more uniformly across the entire usable range of the engine.
Rear Linkage
Unlinke others in the category, Beta RR models have a linkage system in the rear suspension for a more plush trail ride feel with the ability to react to sharp square-edged hits as well.
| MODEL | 390 RR |
| ENGINE TYPE | Single cylinder, 4 -stroke, liquid cooled, 4-valve (Titanium intake and steel exhaust), cooling fan, electric start. (back up kick starter as an option) |
| BORE | 88mm |
| STROKE | 63.4mm |
| DISPLACEMENT | 385.6cc |
| COMPRESSION RATIO | 12.48:1 |
| VALVE TRAIN | Finger followers w/ shim adjustment |
| IGNITION | Dual-Map Kokusan 200w output |
| SPARK PLUG | NGK LKAR8A-9 |
| LUBRICATION | Twin Oil Pumps w/ Cartridge Filter & Separate Compartments For Engine & Transmission |
| FUEL SYSTEM | 42mm Throttle Body w/ Dual Injectors |
| CLUTCH | Wet Diaphragm-style |
| TRANSMISSION | 6 Speed |
| FINAL DRIVE | O-ring chain |
| TRACTION CONTROL | On-Demand w/ push of a button |
| FRAME | Molybdenum steel / Double Cradle w/ quick air filter access |
| WHEELBASE | 58.7" |
| SEAT HEIGHT | 37" |
| GROUND CLEARANCE | 12.6" |
| FOOTREST HEIGHT | 16.3" |
| DRY WEIGHT | 237 lbs |
| FUEL TANK CAPACITY | 2.4 US Gallons |
| FRONT SUSPENSION | 48 mm Sachs Open Cartridge with compression, rebound & Ignition spring preload adjustment |
| REAR SUSPENSION | Aluminum Body Sachs shock w/ adjustable rebound and hi/low speed compression |
| FINAL GEARING | 13T Front/49T Rear |
| FRONT WHEEL TRAVEL | 11.6" |
| REAR WHEEL TRAVEL | 11.4" |
| FRONT BRAKE | 260 mm floating rotor |
| REAR BRAKE | 240 mm rotor |
| FRONT/REAR RIM | 21" (Front) 18" (Rear) |
| FRONT/REAR TIRE | Maxxis Enduro |
*Specifications subject to change without notice. Additional information on all models including manuals, accessories and parts books are available online at www.betausa.com under SUPPORT.
