140cc Dirt Bike for Teens & Adults — FRP Moto FX140, Oil-Cooled 4-Speed Manual

The FX140 is our advanced 140cc trail bike — the step up for teens and adults who have outgrown a first dirt bike and want real trail speed and capability.

FX140 key specs

Engine	140cc oil-cooled 4-stroke
Power	~8.7 hp (6.5 kW) @ 7,000 rpm
Torque	11 Nm @ 5,500 rpm
Transmission	4-speed manual clutch, chain drive
Top speed	~65 mph (105 km/h)
Seat height	~33.9 in (860 mm)
Weight	~174 lb (79 kg)
Wheels	17" front / 14" rear
Brakes	Hydraulic disc (front & rear)
Fuel tank	5.4 L (~1.4 gal)
Use	EPA off-road only — not street legal, not sold in California

Who the FX140 is for

The FX140 is an upgrade machine, not a starter. With ~65 mph on tap, a 4-speed manual clutch, and a ~33.9-inch seat, it suits taller or experienced teen and adult riders ready for faster, rougher terrain — riders who already know how to shift and want more bike under them. Its smaller-bore sibling, the FX125, shares the same platform for lighter or younger riders and comes in two wheel sizes.

Where the FX140 fits

FRP Moto bikes follow a rider growth path: a first gas mini bike, then a bigger mini bike, then a first dirt bike, then an advanced trail bike. The FX140 is that last step — for riders who already know how to ride and want more.

Ready to ride

The FX140 is available now and ships across the continental US as an EPA off-road trail bike. Add it to your cart to order, and reach FRP support anytime for fit, setup, or upgrade questions.