Description
Trailmaster continues to impress with the JHL partnership. There is a difference in bikes at this price point, and this bike has them all. Bosch fuel injection paired with the popular Loncin 249.9cc engine. Water cooled with 40 HP. The trans is a constant mesh two-stage 5-speed manual. The suspension is adjustable with KYB shocks front and rear. High-performance DID chain and rims, Forged alloy triple tree and hubs, Kendall tires.
Over the last three years, the JHL bikes have been catching on, and while they’re not yet a Big 5, they are getting close. Attention to detail, such as stainless steel exhaust, a balance shaft engine, a gripper non-slip seat, and a waterproof wire harness, once again puts these bikes in the conversation about quality dirt bikes, but at 50% less. Folding brake levers and 7 series aluminum handlebars keep in light and save downtime from the need for replacement levers. Once again, attention to every detail.
Use high-octane fuel, NO ETHANOL.
Not legal in CA
Created 05/22/2026 BL
- 40 Horse Power Super Powerful water-cooled 250cc Loncin YK250 balance shaft engine
- BOSCH EFI system
- Large frame with 37.8-inch seat height
- KYB Front and Rear shocks
- Performance stainless steel muffler
- DID front and rear rims
- High performance Japanese DID Chain
- CNC alloy linkage
- CNC forged alloy upper and lower triple clamps
- 3A Lithium battery
- 7 series aluminum alloy handlebar
- Kenda tires
- Waterproof wire harness
- Non-slip gripper seat
Tech Specs
| Brand/Model | LONCIN / YK250 |
| Type | Single-cylinder, four-stroke, water-cooled, DOHC, four-valve, balance shaft,EFI |
| Bore × Stroke (mm) | 79 × 51 |
| Displacement (mL) | 249.9 |
| Compression Ratio | 13.9:1 |
| Maximum Net Power & Speed (kW/(r/min)) | 30 / 11,500 (1 ± 1.5%) |
| Maximum Horse Power | 40.28 |
| Maximum Torque & Speed (N·m/(r/min)) | 27 / 10,500 (1 ± 1.5%) |
| Minimum Idle Stable Speed (r/min) | 1500 ± 150 |
| Minimum Fuel Consumption Rate (g/(kW·h)) | ≤354 |
| Fuel Type & Grade | Unleaded gasoline, 95# or above |
| Lubricating Oil Grade | Engine oil 10W-40, SL or above |
| Lubricating Oil Capacity (L) | 1.1 |
| Lubrication Method | Combined pressure & splash |
| Clutch Type | Manual, wet multi-plate |
| Transmission Type | Constant-mesh, two-stage, 5-speed |
| Starting Method | Electric start |
| Ignition System | BOSCH EFI |
| Gear Shift Pattern | International 5-speed |
| Final Drive | Chain drive |
| Vehicle Specifications | |
| Overall Dimensions (L × W × H) (in/mm) | 85.4 X 32.7 X 50.8/ 2170 × 830 × 1290 |
| Wheelbase (in/mm) | 59 /1500 |
| Minimum Ground Clearance (in/mm) | 11.8 / 300 |
| Seat Height (in/mm) | 37.8 / 960 |
| Minimum Turning Radius (in/mm) | 98.4 / 2500 |
| Curb Weight (lb) | 235.4 |
| Rated Load Capacity (lb) | 330 |
| Brake Type (Front/Rear) | Disc / Disc |
| Brake Operation (Front/Rear) | Hand-operated / Foot-operated |
| Rim Type (Front/Rear) | Spoked / Spoked |
| Tire Size (Front/Rear) | 80/100-21 / 100/90-19 |
| Tire Pressure (Front/Rear) (kPa) | 225 / 230 |
| Maximum Speed (m/h) | 66 |
| Starting Performance (s) | ≤15 |
| Acceleration Performance | Start Acceleration (s): ≤15 |
| Overtaking Acceleration (s): ≤15 | |
| Climbing Ability (°) | ≥20 |
| Fuel Tank Capacity (Gallon) | 1.6 |
| Key Features | |
| F&R shocks | KYB |
| Max Power | 40 HP |
| Rims | DID |
| Hub | CNC alloy |
| Linkage | CNC alloy |
| Chain | DID |
| F&R Brake | NISSIN |
| Fuel Supply | BOSCH EFI |
| Tire | Kenda |
