High-Torque Off-Road Electric Dirt Bike with Adjustable Suspension
HKM-394707 Electric Dirt Bike
The HKM-394707 is built around torque rather than top speed. An 8000 W brushless motor produces a documented 330 Nm (243.4 lb-ft) peak at the rear wheel, fed by a detachable 72 V 35 Ah lithium pack holding 2520 Wh for a 62-81 mi (100-130 km) range. Fully adjustable hydraulic suspension with 7.5 in (190 mm) of travel at both ends, 210 mm hydraulic disc brakes, 70/100-19 and 80/100-19 knobby tires, and a 6061 aluminum chassis rated to 331 lb (150 kg) make it a machine for sand, mud, rock, and long climbs.
8000 W Brushless Motor330 Nm (243.4 lb-ft) Peak Torque72 V 35 Ah / 2520 Wh Detachable Pack62-81 mi (100-130 km) Range7.5 in (190 mm) Adjustable Travel210 mm Hydraulic Disc Brakes70/100-19 and 80/100-19 Knobbies331 lb (150 kg) Load
Motor
8000 W
Brushless, 330 Nm peak torque
Battery
72 V 35 Ah
2520 Wh detachable lithium
Top Speed
31+ mph
50+ km/h, documented figure
Range
62-81 mi
100-130 km, terrain dependent
Suspension
7.5 in
190 mm travel, adjustable front and rear
Load Capacity
331 lb
150 kg rider plus gear
Overview
Torque is the headline figure on the HKM-394707: 330 Nm, or 243.4 lb-ft, measured at the rear wheel. That is the number that decides whether a machine walks up a loose, rutted climb or spins and stalls partway. The 8000 W brushless motor produces it from a standstill - electric drive has no powerband to find and no clutch to slip - so the bike pulls from zero in sand, mud, and on rocky inclines where a combustion engine would need revs and momentum.
Energy comes from a detachable 72 V 35 Ah lithium pack holding 2520 Wh. Detachable matters more than it sounds: you can slide the pack out and carry it inside to charge, which suits apartment living and base-camp setups where running a cable to the bike is impractical. A battery management system supervises charging, balancing, and discharge limits, and a full charge takes 3-5 hours from a standard 110 V or 220 V outlet.
Suspension is the other area where this machine separates itself. Both ends use fully adjustable hydraulic dampers with piggyback reservoirs and 7.5 in (190 mm) of travel. The reservoirs keep the oil and nitrogen separated so damping stays consistent as the shock heats up on a rough descent, and the compression and rebound clickers let you set the machine up for your own weight and the ground you actually ride.
The chassis is welded from 6061 aluminum alloy with double-pass smoothed joints for stress distribution, and the swingarm geometry is set for off-road tracking stability. Load rating is 331 lb (150 kg), covering the rider plus full protective gear and a pack. Electrical components are sealed to IP54, so rain and shallow puddles are within normal use.
Key Features
8000 W Brushless Motor, 330 Nm Peak Torque
A high-efficiency 8000 W brushless motor delivers a documented 330 Nm (243.4 lb-ft) of peak torque at the rear wheel, available from a standstill. The electronic controller meters current to limit heat build-up during sustained high-load work, which is what allows repeated long climbs rather than a single hard effort followed by a cool-down.
72 V 35 Ah Detachable Lithium Pack (2520 Wh)
The pack unlocks and slides out, so it can be charged on or off the machine - useful if you park in a garage without power or live above ground level. A full charge takes 3-5 hours from a standard 110 V or 220 V outlet, and the BMS protects against overcharge, over-discharge, and cell imbalance.
Fully Adjustable Hydraulic Suspension, 7.5 in Travel
Front and rear dampers use piggyback reservoirs and offer 7.5 in (190 mm) of travel with compression and rebound clickers plus spring preload. The inverted front design reduces unsprung weight, and the linkage rear suspension has a progressive rate that handles big hits without bottoming out.
210 mm Hydraulic Disc Brakes with Sintered Pads
Dual 210 mm rotors with sintered pads front and rear give consistent bite and modulation, including in wet conditions where organic pads lose feel. Sintered material tolerates heat well, so repeated braking on a long descent does not produce the fade that would compromise control.
Chain Final Drive with Adjustable Tension
A heavy-duty roller chain transmits drive to the rear wheel with sliding axle adjusters setting tension. Gearing is a tuning option: a larger rear sprocket increases the already substantial climbing torque, while a smaller one raises top speed for open terrain.
70/100-19 Front and 80/100-19 Rear Knobby Tires
Directional knobbies at the front and a wider 80/100-19 rear find grip on hardpack, loam, gravel, and mud. Multi-edge tread blocks are self-cleaning in sticky soil, and the 19 in rims give ample sidewall flex for bump absorption while resisting pinch flats.
LED Headlight and Tail-Light
Both run directly off the main pack, so there are no auxiliary batteries to maintain. The beam pattern is set for trail work - wide enough to read the ground immediately ahead and bright enough for early-morning and dusk sessions.
6061 Aluminum Chassis, 331 lb Load Rating
The frame is welded from aerospace-grade 6061 aluminum alloy with double-pass smoothed joints for stress distribution, balancing torsional strength against weight. Load rating is 331 lb (150 kg), which accommodates a rider in full protective gear plus a hydration pack and tools.
Full Specifications
Model
HKM-394707 | Electric Dirt Bike
Frame Material
6061 aluminum alloy, welded with double-pass smoothed joints
Motor
8000 W brushless, 330 Nm (243.4 lb-ft) peak torque
System Voltage
72 V DC
Battery
72 V 35 Ah lithium-ion (2520 Wh), detachable, with BMS
Charger
Smart charger, 110-220 V AC input
Charging Time
3-5 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
31+ mph (50+ km/h)
Range Per Charge
62-81 mi (100-130 km); eco mode extends distance on flat hardpack
Climbing Grade
Steep loose grades within the rated load; 330 Nm available from a standstill
Peak Torque
330 N.m (243.4 lb-ft) at the rear wheel
Controller
72 V controller with energy-flow optimisation to limit heat build-up
Brakes
Hydraulic disc, 210 mm rotors front and rear, sintered pads
Suspension
Fully adjustable hydraulic front and rear, 7.5 in (190 mm) travel, piggyback reservoirs
Tires
Front 70/100-19, rear 80/100-19 knobby off-road tires
Wheels
19 in rims front and rear
Seat
Long flat off-road seat with narrow midsection
Display
Backlit LCD: speed, battery state of charge, ride mode, trip and odometer
Throttle
Twist-grip throttle with eco and standard ride modes
Lighting
LED headlight and tail-light powered by the main pack
Load Capacity
331 lb (150 kg) rider plus gear
Ingress Protection
IP54-rated electrical components, resistant to splashing water and dust
Recommended Rider Height
5 ft 4 in to 6 ft 4 in (163-193 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 72 V 35 Ah pack stores 2520 Wh. The 72 V architecture keeps current draw moderate for the power on offer, which limits resistive heating in the controller and phase wiring and helps the pack hold voltage under the heavy loads that 330 Nm of torque implies. An intelligent BMS guards against overcharge, overheating, and deep discharge, and balances the cells on every charge cycle.
Documented range is 62-81 mi (100-130 km). On mixed trails with moderate hills, expect 68-75 mi (110-120 km). Aggressive riding or deep sand brings it closer to 62 mi (100 km), while eco mode on flat hardpack can push past 81 mi (130 km). Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent, which returns as the pack warms.
Tip: The pack is detachable: unlock it, slide it out, and charge indoors with the supplied 110-220 V charger. A full cycle takes 3-5 hours. For storage beyond a month, leave the pack at 40-60 percent charge and top it up every 4-6 weeks.
Charging on the machine works equally well when a socket is available - the port is accessible without removing anything. Let the pack cool to ambient temperature after a hard ride before plugging in, and always charge on a hard, non-flammable surface.
Daily Use & Care
- Check chain tension and lubrication before every ride. High torque loads the chain heavily, so a worn or dry chain will show up as noise and lost drive quickly.
- Set tire pressure for the surface: 18-22 psi for hard pack, 12-15 psi for sand, loam, and rock where you want the casing to deform around obstacles.
- Inspect the 210 mm rotors and sintered pads every few rides. Keep rotors free of oil and grease, and replace pads before the friction material drops below 1 mm.
- Rinse the frame, swingarm, and calipers after wet or muddy rides, but keep pressure washers away from the motor, controller, battery contacts, and wheel bearings.
- Wipe the fork stanchions after each ride and check for oil weeping past the seals; note your clicker settings before any service so they can be restored.
- Re-torque axle nuts, triple clamp bolts, caliper bolts, and sprocket bolts after the first few hours of riding and monthly thereafter.
- Dry the machine after wet rides. IP54 sealing resists splashing water, but standing moisture around connectors is worth removing.
What's in the Box
- 1 x HKM-394707 electric dirt bike, approximately 90 percent pre-assembled
- 1 x 72 V 35 Ah detachable lithium battery pack
- 1 x Smart charger with 110-220 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches, axle spanner, and suspension clicker tool
- 1 x Pair of serrated off-road footpegs (pre-installed)
- 1 x Front fender and number plate set
- 1 x User manual and pre-delivery inspection guide
Frequently Asked Questions
What is the actual range in off-road conditions?+
Range varies with terrain, rider weight, and speed. On mixed trails with moderate hills, expect 68-75 mi (110-120 km). In aggressive riding or deep sand, range may be closer to 62 mi (100 km). Eco mode can extend it past 81 mi (130 km) on flat hardpack.
How do I charge the battery, and can I charge it off the machine?+
The 35 Ah pack is detachable: unlock it and slide it out. Connect the included smart charger to any standard household outlet at 110 V or 220 V. A full charge takes 3-5 hours, and the BMS prevents overcharging and balances the cells automatically.
Is the suspension suitable for heavier riders?+
Yes. The fully adjustable hydraulic fork and shock allow spring preload, compression, and rebound tuning, so riders up to the 331 lb (150 kg) load rating can set sag correctly. The linkage rear suspension progression handles big hits without bottoming out.
What maintenance does the electric drivetrain require?+
The brushless motor needs no scheduled service. Keep the chain clean and lubricated, check brake pads periodically, and inspect tire pressure before rides. There are no oil changes, air filters, or fuel stabilisers to think about.
Can I ride in rain or through puddles?+
The electrical components are sealed to IP54, meaning resistance to splashing water and dust ingress. Rain and shallow puddles are fine. Do not submerge the motor or battery, and dry the machine after wet rides.
Why is the top speed only 31+ mph with 8000 W on tap?+
Gearing puts the output into torque rather than top-end. The result is 330 Nm at the rear wheel, which is what climbing, sand, and technical terrain actually demand. Fitting a smaller rear sprocket raises top speed at the cost of low-speed pull if you want the opposite balance.
How much assembly is required out of the box?+
The machine ships roughly 90 percent assembled. Remaining steps are fitting the front wheel and fender, mounting and aligning the handlebar, and checking chain tension and brake function. Budget 45-60 minutes with the supplied tools.
Is this street legal?+
Treat it as an off-road machine unless your local authority says otherwise. An 8000 W motor places this vehicle outside e-bike classifications in most US jurisdictions. Check your state DMV and any OHV registration requirements before riding anywhere but private land.
Service & Policies
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24 Months Warranty Service
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CERoHSUN38.3 BatteryIP54 Electrics2520 Wh Pack330 Nm Torque190 mm Travel
Why Choose the HKM-394707
330 Nm From a Standstill
Electric drive produces peak torque at zero rpm, with no powerband to find and no clutch to slip. On a steep, loose start that is the difference between rolling away cleanly and stalling with a foot down on a hillside.
Suspension You Can Actually Tune
Compression and rebound clickers plus spring preload at both ends mean the machine can be set up for your weight and your terrain rather than for an average rider. Piggyback reservoirs keep damping consistent as the oil heats on a long, rough descent.
Detachable Pack for Real-World Charging
Sliding the 35 Ah pack out and carrying it indoors solves the problem most electric owners hit first: no socket where the machine is parked. Charge at a desk, in a hotel room, or at a base camp generator, then drop it back in.
Near-Silent Trail Presence
No exhaust note means you hear tires, terrain, and other riders. Quiet running also keeps routes accessible in areas where noise complaints have closed trails to combustion machines.
No Fuel, Filters, or Oil Changes
Ownership reduces to chain care, brake pads, tires, and periodic suspension service. No carburettor to re-jet for altitude, no air filter to clean after every dusty ride, and nothing to stabilise before winter storage.
IP54-Sealed Electrics
The electrical system is sealed against splashing water and dust ingress, so rain, wet grass, and shallow puddles are part of normal use rather than a reason to turn back.
Controls & Indicators
Key Switch
Turn to wake the system; the display confirms state of charge before drive is enabled
Ride Mode Selector
Handlebar buttons switch between eco and standard power maps
Twist Throttle
Right-hand grip with progressive response mapped by the selected ride mode
Speedometer
Live speed readout in mph, switchable to km/h in the display settings
Battery Gauge
Segmented state-of-charge bar plus percentage readout on the LCD
Light Switch
Left-hand switch cube toggles the LED headlight and tail-light
Suspension Clickers
Compression and rebound adjusters plus preload collars at both ends
Pre-Ride Safety Checklist
- Check chain tension and lubrication, and confirm the rear axle nuts are torqued after any adjustment.
- Set tire pressure for the terrain and inspect the 70/100-19 front and 80/100-19 rear knobbies for cuts or torn blocks.
- Squeeze both brake levers; each should firm up well before the grip, with no sponginess indicating air in the hydraulic line.
- Check pad thickness through the caliper window and confirm the 210 mm rotors are clean and free of scoring.
- Confirm the battery pack is locked into place and the display shows the expected state of charge.
- Compress the fork and shock through their travel, check for oil past the seals, and confirm your clicker settings match the terrain.
- Test the throttle at walking pace in a clear area; in eco mode first if the rider is unfamiliar with the machine.
- Wear a certified off-road helmet, goggles, gloves, boots, and body protection appropriate to the terrain and speed.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the key switch is on and the display shows charge, that the battery is locked fully into its mount, that neither brake lever is held, and that the kill switch is in the run position. If an error code appears, note it and contact support before riding.
Range is shorter than the documented 62-81 mi.+
Check tire pressure and chain drag first. Then consider the ride profile - deep sand and aggressive riding sit at the bottom of the range band, while eco mode on hardpack sits above it. Cold weather temporarily reduces available capacity by 10-20 percent.
The suspension bottoms out on landings.+
Add spring preload to set correct static sag for your weight, then add compression damping a click at a time. If the machine still bottoms with sag set correctly, a heavier spring rate is the right answer rather than more damping.
The brakes squeal or feel wooden.+
Sintered pads need bedding in with 10-15 progressive stops from moderate speed. Squeal usually indicates glazed pads or a contaminated rotor - clean the rotor with brake cleaner and deglaze the pad surface, and check for fork oil or chain lube overspray.
The chain jumps or rattles under power.+
High torque punishes worn drivetrain parts. Check free play at the midpoint of the lower run, then inspect the sprocket teeth for hooking. A worn sprocket destroys a new chain quickly, so replace them as a set.
The display shows an error code and the machine will not move.+
Switch the system off, wait 30 seconds, and switch it back on. If the code returns, record it with the conditions that produced it and contact support - codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-394707 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- IP54 - Ingress protection rating for the electrical components against dust and splashing water.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a high-torque off-road electric motorcycle producing a documented 330 Nm (243.4 lb-ft) at the rear wheel. Read the manual fully before the first ride, start in eco mode, and practise throttle control on open ground before riding technical terrain - full torque from a standstill catches out riders used to combustion machines.
- Wear a certified off-road or motocross helmet on every ride, plus goggles, gloves, boots, and body protection suited to the terrain.
- Do not exceed the 331 lb (150 kg) load rating, which includes the rider and all carried gear.
- Ride on private land, licensed OHV areas, or roads where local law permits. An 8000 W machine is generally not classed as an e-bike.
- Bed in the sintered brake pads with 10-15 progressive stops from moderate speed before riding at full pace.
- IP54 sealing resists splashing and dust; do not submerge the motor, controller, or battery in standing water.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface, and never leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
- Reduce speed substantially on wet rock, loose gravel, and steep descents; knobby tires add grip but do not eliminate the risk of losing traction.
HKM-394707 · 8000 W brushless motor, 330 N.m (243.4 lb-ft) peak torque · 72 V 35 Ah detachable lithium (2520 Wh) · 3-5 hour charge · 31+ mph (50+ km/h) top speed · 62-81 mi (100-130 km) range · fully adjustable hydraulic suspension, 7.5 in (190 mm) travel · 210 mm hydraulic disc brakes with sintered pads · 70/100-19 front and 80/100-19 rear knobby tires · 6061 aluminum frame · 331 lb (150 kg) load capacity · IP54 electrics. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding off private land.
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