This warranty applies to the HMP FLASH and Lightning MK.II electric motorcycles.
Looking for the warranty on an e-moped, e-scooter or e-bike? See our general warranty policy.
Coverage at a glance
- Core components (motor, controller, battery incl. BMS) — 12 months or 10,000 miles, whichever comes first.
- All other covered parts — 12 months, with no mileage limit.
- Consumables (brake pads, tires, bulbs, fuses) — not covered.
- Coverage starts on the purchase date shown on your receipt, and applies to the original owner only.
Part I — Warranty Coverage Schedule
| Category | Parts | Warranty Period | Method |
|---|---|---|---|
| Core Components | Motor, Controller, Battery (incl. BMS) |
12 months / 10,000 miles (whichever comes first) |
Replace |
| Electrical System | Charger, Relay, Converter, Flasher, Speedometer, Horn | 12 months | Replace |
| Main Electrical | Main Wiring Harness, Switches, Throttle Handle, Brake Cut-off Handle | 12 months | Replace |
| Structural Components | Frame, Handlebar | 12 months | Replace |
| Suspension & Mechanical | Front Fork, Rear Shock, Rear Fork, Axles, Wheels | 12 months | Replace |
| Brake System (Functional) | Brake Pump, Brake Disc | 12 months | Replace |
| Body & Exterior | Plastic Parts, Lamp Cover (excluding bulb) | 12 months | Replace |
| General Parts | Seat, Stands (main/side), Lock Set, Luggage, Battery Box | 12 months | Replace |
| Consumables | Brake Pads, Tires, Bulbs, Fuses | No warranty | N/A |
All warranty claims are subject to inspection and final approval by HMP Bikes. Any claim outside the specified warranty period or scope will not be covered.
Part II — Battery Maintenance Requirements
These are requirements, not suggestions. Battery failures caused by skipping them are not covered.
- Charge cycle — every 2 months. The battery must undergo at least one full charge and discharge cycle every two months. Failure to charge regularly, or a deep discharge caused by neglect, is not covered.
- Storage — keep it at 40–60%. For long-term storage, the battery must be held at a 40–60% state of charge. Storing it fully discharged or fully charged for extended periods, or in extreme temperatures or high humidity, will void the battery warranty.
- Charging — use the supplied charger. Damage caused by incompatible chargers or incorrect charging methods is not covered.
If you are storing the bike over winter, put a reminder in your calendar. This is the single most common reason a battery claim is denied.
Part III — What Voids the Warranty
Improper operation and maintenance
- Mechanical neglect and wear. Skipping routine inspections, or continuing to ride on worn components. Normal wear-related failures (brake wear, tire wear, natural aging of parts) are never covered.
- Electrical and environmental neglect. Exposing the wiring harness or electrical components to water, dirt or corrosion through lack of protection.
- Continued use after a fault. Riding on after a known issue or warning sign appears — intermittent failures, loose connections — or failing to follow recommended service procedures.
Abuse, modification and external factors
The warranty is completely voided under any of the following:
- Unauthorized modification or disassembly. Modifying the electrical system (wiring harness, controller, firmware), installing non-original accessories (lights, USB ports, alarms), or unauthorized disassembly and repair.
- Non-OEM parts. Damage caused by aftermarket or incompatible components.
- Physical damage and human factors. Collisions, crashes, overloading, overspeeding, or intentional abuse.
- Force majeure and external factors. Fire, flood, earthquake, natural disasters, or severe chemical exposure and contamination.
Part IV — Real-world examples
These are the scenarios we see most often. We are publishing them so you know where you stand before something goes wrong, not after.
1. The battery that sat all winter — not covered
What happened: the bike was stored in a garage for roughly five months. In spring, the battery would not power on or accept a charge.
Why it isn't covered: the battery must complete a full charge/discharge cycle every two months. Five months untouched causes a deep discharge the pack cannot recover from. This is the most common denied claim we see — and the easiest to avoid.
2. A burned-out controller after a speed unlock — not covered
What happened: the bike died on a hill with an error code and a burnt smell. Inspection found custom firmware (or a hardware shunt mod) that bypassed the factory speed and current limits, overheating the controller's MOSFETs.
Why it isn't covered: pushing the controller past its factory safety limits directly caused the failure. Any alteration to the electrical system voids the warranty entirely.
3. A seized motor after deep water — not covered
What happened: a grinding noise, then a locked rear wheel. Opening the hub revealed thick mud, heavy rust on the stator, and standing water, with a waterline well above the axle.
Why it isn't covered: the bike is rated IPX6 — it handles rain, not submersion. Riding through a flooded street exceeds the IP rating and counts as environmental neglect.
4. A melted wiring harness after DIY lighting — not covered
What happened: total power loss and visibly melted wires. Inspection found the main harness had been spliced into to run aftermarket high-power LED lights. The added load and the splice caused a short.
Why it isn't covered: splicing into the harness changes the original electrical load and compromises safety. If you want extra lighting, talk to us first.
5. Electrical gremlins after pressure washing — not covered
What happened: a flickering display, a throttle cutting out, intermittent no-starts. Inspection found heavy green corrosion and trapped water in the harness connectors. The bike had been cleaned weekly with a commercial pressure washer aimed directly at the handlebars and cables.
Why it isn't covered: high-pressure water forced into electrical joints breaches the waterproof seals. Wash by hand, and keep the spray away from connectors.
6. Squeaking brakes after six months of delivery work — not covered
What happened: after six months of daily delivery riding, the brakes squeaked and stopping distances grew.
Why it isn't covered: brake pads are consumables. Wear from heavy use is expected, and replacement parts and labor are the owner's responsibility.
How to file a claim
- Stop riding. Continuing to ride with a known fault can cause further damage — and that further damage will not be covered.
- Document it. Take clear photos and video of the affected part. Locate your serial number and your receipt.
- Submit your claim. Allow up to 3 business days for a response by email.
- Inspection. Once accepted, return the item by shipment or bring it to one of our stores. Ship it in the original packaging where possible.
- Resolution. We will repair the product at no charge, or send the replacement part with installation instructions.
Unless the item arrived damaged, shipping and handling costs related to a warranty claim are the customer's responsibility. Replacement parts may be new or refurbished.
Questions
Not sure whether something is covered? Ask before you ride on it. Email business@hmpbikes.com or call 916-926-3649, or visit us at 440 F Street, Davis, CA or 261 6th Street, San Francisco, CA.
These terms are subject to change at any time.