# Honda CRF150R

The Honda CRF150R is a racing motocross bike that was released in 2006 for the 2007 model year. It competes in the Mini Class against many 85 cc (5.2 cu in) two-stroke bikes; however, it cannot race in the 85cc mod. or stock class. It must race in the Supermini class. All of Honda's 2008 models are four-strokes whereas in years past, some of their racing bikes were two-strokes. The 150R features a powerful Unicam four-valve liquid-cooled engine that produces impressive power at a wide RPM range. And only weighs 185 pounds wet (with fluids) . With its fully adjustable Showa suspension, high-quality Dunlop Tires and disc brakes front and rear, this is one of the best mini racing bikes Honda has made. The CRF150R come in two versions: the regular and the Expert.
The Expert costs an extra $100 and offering several new features specifically for larger riders. Features include a taller seat height, higher ground clearance, larger wheelbase, increased tire size, longer swing arm and larger rear sprocket for better acceleration with a heavier rider. All of these Expert features only add an additional 4 pounds. This model is referred to as the CRF150RB R meaning Race, and B meaning Big wheel.

## Specifications

All specifications are manufacturer claimed.
| | 2007 | 2008 | 2007 | 2008 |
| Model | CRF150R | CRF150R | CRF150R Expert (CFR150RB) | CRF150R Expert (CFR150RB) |
| Engine |||||
| Engine Type | 149 cc (9.1 cu in) Liquid-cooled single cylinder four-stroke | 149 cc (9.1 cu in) Liquid-cooled single cylinder four-stroke | 149 cc (9.1 cu in) Liquid-cooled single cylinder four-stroke | 149 cc (9.1 cu in) Liquid-cooled single cylinder four-stroke |
| Bore/Stroke | 66 mm (2.6 in) x 43.7 mm (1.72 in) | 66 mm (2.6 in) x 43.7 mm (1.72 in) | 66 mm (2.6 in) x 43.7 mm (1.72 in) | 66 mm (2.6 in) x 43.7 mm (1.72 in) |
| Compression Ratio | 11.7:1 | 11.7:1 | 11.7:1 | 11.7:1 |
| Valve Train | Unicam | Unicam | Unicam | Unicam |
| Carburetion | Keninin 32mm flat side with throttle position sensor (TPS) | Keninin 32mm flat side with throttle position sensor (TPS) | Keninin 32mm flat side with throttle position sensor (TPS) | Keninin 32mm flat side with throttle position sensor (TPS) |
| Ignition | Solid-state CD with electronic advance | Solid-state CD with electronic advance | Solid-state CD with electronic advance | Solid-state CD with electronic advance |
| Drivetrain |||||
| Transmission | Close-Ratio Five Speed Manual | Close-Ratio Five Speed Manual | Close-Ratio Five Speed Manual | Close-Ratio Five Speed Manual |
| Final Drive | #420 steel chain, 15T/50T | #420 steel chain, 15T/50T | #420 steel chain, 15T/56T | #420 steel chain, 15T/56T |
| Chassis/Suspension/Brakes |||||
| Front Suspension | 37 mm fully adjustable leading-axle inverted Showa cartridge fork; 10.8 in (274 mm) travel | 37 mm fully adjustable leading-axle inverted Showa cartridge fork; 10.8 in (274 mm) travel | 37 mm fully adjustable leading-axle inverted Showa cartridge fork; 10.8 in (274 mm) travel | 37 mm fully adjustable leading-axle inverted Showa cartridge fork; 10.8 in (274 mm) travel |
| Rear Suspension | Pro-Link fully adjustable Showa single shock; 10.8 in (274 mm) travel | Pro-Link fully adjustable Showa single shock; 10.8 in (274 mm) travel | Pro-Link fully adjustable Showa single shock; 11.5 in (292 mm) travel | Pro-Link fully adjustable Showa single shock; 11.5 in (292 mm) travel |
| Front Brakes | Single 240 mm Disc | Single 240 mm Disc | Single 240 mm Disc | Single 240 mm Disc |
| Rear Brakes | Single 190 mm Disc | Single 190 mm Disc | Single 190 mm Disc | Single 190 mm Disc |
| Front Tire | 70/100-17 | 70/100-17 | 70/100-19 | 70/100-19 |
| Rear Tire | 90/100-14 | 90/100-14 | 90/100-16 | 90/100-16 |
| Dimensions |||||
| Rake | 27.02 degrees | 27.02 degrees | 27.48 degrees | 27.48 degrees |
| Trail | 78.0 mm (3.07 in) | 78.0 mm (3.07 in) | 96.0 mm (3.78 in) | 96.0 mm (3.78 in) |
| Wheelbase | 49.6 in (1,260 mm) | 49.6 in (1,260 mm) | 50.6 in (1,285 mm) | 50.6 in (1,285 mm) |
| Seat Height | 32.8 in (833 mm) | 32.8 in (833 mm) | 34.1 in (866 mm) | 34.1 in (866 mm) |
| Ground Clearance | 11.9 in (302 mm) Brady | 11.9 in (302 mm) Brady | 13.3 in (338 mm) | 13.3 in (338 mm) |
| Dry Weight | 165.3 lb (75.0 kg) | 165.3 lb (75.0 kg) | 169.7 lb (77.0 kg) | 169.7 lb (77.0 kg) |
| Fuel Capacity | 1.14 US gallons (4.3 L; 0.95 imp gal) | 1.14 US gallons (4.3 L; 0.95 imp gal) | 1.14 US gallons (4.3 L; 0.95 imp gal) | 1.14 US gallons (4.3 L; 0.95 imp gal) |