Zero FX — complete owner's guide

The Zero FX is Zero Motorcycles' lightweight dual-sport: freeway-capable yet trail-friendly, with a 21-inch front and 18-inch rear wire wheel and knobby dual-sport tyres. It is a true zero-emissions vehicle with no gears to shift, no clutch, no oil and almost no routine drivetrain upkeep. Power comes from a passively air-cooled Z-Force 75-5 brushless motor driving the rear wheel through a clutchless direct drive and a Gates Poly Chain carbon belt (a chain is available as an option).

At the heart of the FX is the Z-Force Intelligent Modular power pack rated at 7.2 kWh maximum (6.3 kWh nominal). Depending on how it was ordered, the FX can carry one or two modular packs, letting you swap or charge one while riding on another. The motor delivers 106 Nm (78 lb·ft) of torque and roughly 34 kW (44-46 hp), good for a top speed near 137 km/h (85 mph) and a thermally sustainable cruise around 113 km/h (70 mph).

The FX is deliberately light and nimble, so it rewards smooth inputs and rewards riders who treat it as the genuine performance machine it is. Its closest sibling is the street-focused FXE, which shares the same powertrain but uses cast wheels, road tyres and revised bodywork.

The FX uses a three-position key switch on the fork: Steering Lock, OFF and ON. In ON the lights and dash wake up and the bike is ready to be armed. To lock the steering, turn the bars fully left, push the key down and turn it counter-clockwise with the key in OFF, then remove it. The digital dash shows a central speedometer ringed by a 12-segment analog bar (each segment represents 12.5 mph / 20 km/h), along with the odometer, battery charge level, a torque/power output meter and a regen meter that shows energy flowing back into the pack.

Two customisable readouts flank the dash. Display A (press SEL once, then ADJ to cycle) shows Range, Motor RPM, Trip 1 or the two-digit Error code. Display B (press SEL twice) shows Trip 2, Instant energy use, Average energy use, Lifetime energy use or Motor temperature. Trip 1 and the average energy reading both reset automatically each time the pack is recharged to 100%. You can switch the clock between 12- and 24-hour formats and toggle speed (mph/km-h) and temperature (°F/°C) units through the same SEL/ADJ menus.

The handlebars carry a high/low beam switch, flash-to-pass, horn, self-cancel-free turn signals (you must cancel them manually), a hazard flasher, the motor stop (run/stop) switch and the performance Mode button. A Bluetooth icon confirms pairing with the free Zero smartphone app, which lets you tune CUSTOM mode, read precise state of charge and real-time power, and email diagnostic logs to Zero support.

The FX offers three performance modes selected with the Mode button on the right handlebar: ECO, SPORT and CUSTOM. ECO reduces acceleration and top speed while adding stronger regenerative braking, making it the best choice for new riders and for maximising range. SPORT sharpens acceleration significantly and eases off the regen, and is aimed at experienced riders. CUSTOM is fully configurable through the smartphone app so you can dial in your own power, torque, top-speed and regen preferences. You can change modes on the move, but the new setting only engages once you return the throttle to fully closed.

The throttle works like any twist-grip: rotate it toward you (counter-clockwise) to accelerate, and release it to let it snap back to closed. The instant you close the throttle while moving, regenerative braking engages, applying a gentle drag on the rear wheel and feeding energy back into the pack. If you want to coast freely without that drag, simply hold the throttle just barely off the fully closed position.

Regen is not a substitute for the brakes, but in ECO mode it does noticeably more of the slowing for you, which is why it feels smoother and stretches range in stop-and-go riding. Because the FX is silent and light, always keep the throttle closed while braking and practise controlled stops until they feel natural.

The FX charges through its integrated 650 W on-board charger using the supplied cord. A full 0-100% charge takes about 9.7 hours (roughly 10 hours in mild temperatures) and about 9.2 hours to 95%; crucially, charging on 240 V is no faster than 120 V because the on-board charger draws the same power either way (up to about 14 A from a 120 V circuit). To slash charge times, the FX supports up to four supplemental accessory quick chargers, which together can cut charging by as much as 75%, reaching full in around 4.1 hours (3.6 hours to 95%). You can charge from a Level 1 public outlet with the supplied cord, or use the optional J1772 adapter (Zero PN 10-03267) at Level 2 stations — though the adapter alone does not speed things up unless a supplemental charger is also fitted.

Temperature limits matter. The pack will not accept a charge below 32°F (0°C) or above 122°F (50°C), and after hard or hot riding it may need up to 30 minutes to cool before it starts charging. Above about 43°C (109°F) the charger reduces current, extending charge time. The whole pack should only be operated between -4°F and 140°F (-20°C to 60°C); the BMS shuts the power controller off beyond that range. In cold weather you may temporarily lose up to 30% range, and Zero advises against riding once the pack drops below 23°F (-5°C).

Battery care is mostly about avoiding long spells at extreme states of charge. If the pack is fully discharged, recharge it within 24 hours. If you ride short distances, there is no need to top to 100% every time — parking at a lower charge in the heat is kinder to the cells. Below 30% SoC, charge to at least 60% and unplug. Once charged, disconnecting the charger puts the pack into a very slow-draining hibernate mode, which is best for long-term health.

Good news for the impatient: the lithium-ion power pack needs no break-in and no special discharge conditioning — it performs from the first ride. The real running-in is about you and the brakes, not the battery. Spend your first rides getting a feel for the FX's light weight, instant torque and silent operation, and learn how your typical route affects range before pushing the performance envelope.

ECO mode is the ideal setting for early rides: gentler acceleration and stronger regen make the bike more predictable while you build confidence. Because the FX is light and quick to stop, practise smooth, progressive emergency braking in a safe area so you can bring it to a controlled halt without locking a wheel.

New brake pads and discs are the one component that genuinely needs bedding-in. Until a thin, even layer of pad material transfers onto the rotor, the first few stops will feel weak. Perform a proper bedding process, and don't neglect the vitally important initial service checks at 100 mi (160 km) and 600 mi (1000 km), which catch anything that settles in early.

The FX is refreshingly low-maintenance — no oil changes, no filters, no coolant — but a schedule still matters for safety and warranty. Zero recommends a dealer service every 12 months regardless of mileage. The framework is: checks before every ride, important initial services at 100 mi (160 km) and 600 mi (1000 km), then a full service every 8000 mi (13,000 km) or 12 months, whichever comes first. At each service, brake fluid, brake operation, wheels, tyres, wheel bearings, chassis fasteners and steering are inspected. Brake fluid is fully replaced every 8000 mi (13,000 km) or 12 months, steering bearings are repacked every 16,000 mi (25,000 km), and the swingarm pivot bearings are checked out to 24,000 mi (37,000 km).

The Gates carbon belt is the FX's standout low-maintenance feature: it needs no lubrication, only occasional cleaning with water and a soft brush (never detergent), and inspection for cuts, exposed cords or bevelling that hints at sprocket misalignment. Check belt tension at the initial 600 mi service and each major service, and replace the belt at 24,000 mi (37,000 km). Correct 11 mm-pitch belt tension is 25-76.5 kg, or a plucked frequency of 42.5-73.6 Hz measured with the Gates Carbon Drive app on the lower belt span. If you opted for the chain drive, inspect and clean it regularly, lubricate it after any exposure to water, and keep total free play around 32 mm (16 mm each way).

Periodically confirm the key chassis fasteners are torqued correctly. Ignore or over-torque these at your peril — several use thread-locker and directly affect handling and safety.

Tyre pressures on the FX are 29 psi (200 kPa) front and 31 psi (214 kPa) rear, checked cold (at least three hours since riding) before every ride; under-inflation is the leading cause of tyre failure. Inspect both wire wheels for bent or missing spokes and cracked rims, and replace tyres when tread drops to about 2 mm (0.08 in) or if you see cuts, bulges or exposed cords. The FX wears Pirelli Scorpion MT-90 A/T dual-sport tyres, 90/90-21 front and 120/80-18 rear.

Braking is handled by Bosch Gen 9 ABS with J-Juan calipers on 240 mm discs front and rear, running DOT 4 fluid. The ABS light is lit at key-ON and switches off once both wheels exceed 3 mph (5 km/h); if it stays on above that speed, ABS is inactive and needs attention. Large front-to-rear wheel-speed differences (wheelies, burnouts, loose gravel) can temporarily disable ABS — bring the bike to a full stop, cycle the key OFF for 5 seconds, then ON to restore it. Replace brake pads when either pad reaches 1.35 mm (0.05 in) and check that discs stay above 3.85 mm (0.15 in).

The FX suspension is fully adjustable: Showa 41 mm inverted cartridge forks (218 mm travel) and a Showa piggyback-reservoir rear shock (227 mm travel), each adjustable for spring preload, compression and rebound. Both ends are preloaded from the factory for a 180 lb (82 kg) rider, giving target sag of 73 mm (2.87 in) front and 82 mm (3.22 in) rear. Heavier riders need more preload. If you reset anything, return to the factory clicks below and re-check headlight aim afterwards, since sag changes affect the beam.

When parking the FX for more than 30 days, leave the charger connected. After 30 days the Battery Management System enters long-term storage mode, drawing the pack down to roughly 80% SoC, then discharging about 1% per day and topping back up to 80% whenever it falls to 30%. Store the bike somewhere cool — ideally 10°C to 35°C (50°F to 95°F) — because heat, especially combined with a high state of charge, accelerates battery ageing. Even if you leave it plugged in, check the displayed state of charge every 30 days by cycling the key ON, reading the SoC, then OFF; never let it sit below 30%.

Winter storage in an unheated garage is fine provided the temperature never drops below -4°F (-20°C), the pack starts at around 60% charge, you check it monthly and top it up above freezing if it falls under 30%. Below -20°C the cells can suffer permanent, accelerated decay. When you bring the bike back into service after storage, disconnect the charger, turn the key ON, raise the side stand and set the run switch to Run to exit storage mode, then charge for at least 24 hours to restore optimal cell balance.

For transport, tie the FX down with soft-strap-protected ratchet straps at roughly 45°, using frame contact points — two straps at the front and two at the rear. Zero specifically advises never towing the bike on one wheel; it must have both wheels on a trailer or transport device, as towing can damage the powertrain.

The FX signals problems two ways: the red system-warning light flashes a repeating count you can read directly, and a two-digit diagnostic code can be pulled up under Display A (press SEL, cycle with ADJ to ERROR). Count the red flashes and match them to the table below. Many faults simply mean the bike is not fully armed — one flash can indicate the motor stop switch is OFF or the kickstand is down, both easy fixes. Others, like a welded contactor or CAN error, need a dealer.

The Battery Management System has its own protections. If the pack is empty it disables the throttle until you recharge — if it won't take even a partial charge within two hours, call a dealer. If the pack is too hot it disables the throttle and charging until it cools; park it somewhere cool and ventilated. If the BMS reports the pack is 'unbalanced', leave it plugged in for up to 72 hours so the BMS can re-balance the cells before riding. On modular ZF3.6 packs, a small window on the pack also flashes red-and-green codes in idle, charge and run modes to show health and state of charge.

Remember that a flashing temperature light is informational, not a malfunction — it is the thermal strategy protecting the powertrain. If you keep the pace up, the bike will gently reduce power until it can sustain its temperature, with no harm done. For issues like a wobbling front end, suspect incorrect tyre pressure, a deformed or worn tyre, or loose headset bearings first.

The FX is a genuine performance motorcycle and demands full protective gear — an approved helmet, eye protection, gloves, boots and proper clothing — on every ride, however short. Because the bike is silent, it is easy to forget it is powered up: always turn both the key switch and the motor stop switch to OFF when you are not actively riding, and switch the motor stop OFF before backing up or pushing the bike while dismounted. The kickstand switch and tip-over sensor are safety interlocks that cut the motor if the stand is down or the bike falls; do not defeat them.

High voltage is the one area that is strictly off-limits to owners. High-voltage cables and connectors are sheathed in orange — never probe, cut, tamper with or modify them, and do not touch high-voltage components after an accident. There are no user-serviceable high-voltage parts; only trained Zero technicians should open the power pack or work on orange wiring. In the rare event of a fire, extinguish visible flame with a Class D extinguisher, then douse with a water-based extinguisher once the flame is out.

Finally, protect your warranty and your safety by using only Zero-approved parts, accessories and chargers, keeping the firmware up to date, and following the battery charging and storage guidelines. Modifications, unapproved add-on electrical equipment, towing, or storing the pack below 30% can all impair the bike or void coverage. The owner is responsible for knowing and obeying all local licensing and road laws.