Overview
The Losi Fork Rebuild Kit for Promoto-MX/SM is an essential suspension maintenance component for RC motorcycle enthusiasts in the UK. Whether you're a seasoned racer or a weekend basher, keeping your Losi 1/4 scale motorcycle in peak condition requires regular maintenance of critical components like the front forks. This comprehensive rebuild kit includes all the hardware, seals, and precision-engineered parts needed to restore your front fork assembly to original specification. If you own a Losi Promoto-MX or Promoto-SM motorcycle RC model, this official Losi spare parts kit is the genuine solution for fork rebuilds, replacements, and performance restoration.
Front forks are one of the most heavily stressed suspension components on any RC motorcycle, absorbing impacts, managing suspension travel, and maintaining ride height through constant cycles of compression and extension. Over time, the seals and internal components wear, reducing damping performance and potentially causing oil leakage. Rather than replacing entire fork assemblies at significant expense, this rebuild kit gives you the ability to service your existing forks with Losi-specified genuine components. The kit features Losi spec'd O-rings and injection moulded plastic parts, ensuring compatibility and reliable performance that meets the manufacturer's exacting standards. This makes it an affordable way to maintain or restore your Promoto-MX or Promoto-SM motorcycle to factory condition.
RC Model Shop stocks this Losi fork rebuild kit as part of our comprehensive range of RC motorcycle spares and maintenance products. We're an authorised Losi retailer serving the UK RC community with genuine parts and expert knowledge. Whether you're preparing for competitive racing, maintaining your basher between sessions, or restoring a motorcycle that's been sitting in storage, this kit provides peace of mind with authentic Losi engineering.
Key Features
- Losi-Specified Components — Every component in this kit is manufactured to Losi's exacting specifications, ensuring perfect compatibility with your Promoto-MX or Promoto-SM motorcycle and guaranteed performance that matches the original factory fork assembly.
- Complete Rebuild Solution — The kit includes all necessary hardware, washers, and O-rings required for a full fork rebuild, eliminating the need to source individual components from multiple suppliers and saving time during maintenance.
- Genuine O-Ring Seals — The kit features authentic Losi-spec'd O-rings and X-ring seals that provide superior damping consistency and durability compared to generic alternatives, maintaining optimal suspension performance across multiple ride sessions.
- Injection Moulded Plastic Parts — Fork guides and other plastic components are injection moulded to precise tolerances, ensuring smooth operation and longevity even under the demanding conditions of competitive RC motorcycle racing.
- Multiple Seal Types Included — With four X-ring seals and four O-ring seals included, this kit provides redundancy and allows you to replace all critical sealing surfaces during a complete rebuild, restoring like-new damping characteristics.
- Travel Limiters and Bushings — The kit includes travel limiters to control fork compression stroke and precision-engineered fork shaft bushings and tube bushings that maintain alignment and reduce friction during suspension travel.
- Dust Wiper Protection — Dust wipers help prevent dirt and debris from entering the fork assembly, extending the interval between rebuilds and protecting internal sealing surfaces from contamination.
- Spacer Variety — Four 2mm spacers and four 4mm spacers are included, allowing you to adjust fork geometry and ride height to suit different track conditions or riding preferences.
Technical Performance
This fork rebuild kit is engineered specifically for the Losi 1/4 scale Promoto-MX and Promoto-SM motorcycles, using the same materials and tolerances found in OEM fork assemblies. The kit contains precision components designed to work together as a system: fork guides maintain alignment, pistons manage hydraulic damping flow, travel limiters prevent over-compression, and multiple sealing surfaces (upper cap O-rings, lower cap O-rings, X-ring seals, and O-ring seals) prevent hydraulic fluid leakage whilst maintaining consistent damping performance. The injection moulded plastic components are engineered for durability under the high-frequency impacts typical of RC motorcycle racing, whilst the hardened washers and Nylock nuts ensure mechanical fasteners remain secure even after hundreds of suspension cycles. The dual bushing design (fork shaft bushings and fork tube bushings) minimises lateral movement and friction, critical for maintaining responsive handling characteristics. By including spacers in both 2mm and 4mm sizes, this kit allows suspension geometry adjustment without requiring additional parts purchases, making it a complete, self-contained maintenance solution for any UK RC enthusiast.
What's in the Box
- 2 x Fork Guides
- 2 x Pistons
- 2 x Travel Limiters
- 2 x X-Ring Spacers
- 4 x 2mm Spacers
- 4 x 4mm Spacers
- 2 x Upper Cap O-Rings
- 2 x Lower Cap O-Rings
- 2 x Dust Wipers
- 4 x X-Ring Seals
- 4 x O-Ring Seals
- 2 x Fork Shaft Bushings
- 2 x Fork Tube Bushings
- 2 x 2.5 x 4.6 x 0.5mm Washers
- 4 x M2.5x5mm Nylock Nuts
Frequently Asked Questions
- Which Losi motorcycles is this fork rebuild kit compatible with? — This kit is specifically designed for the Losi 1/4 Promoto-MX and Promoto-SM motorcycle models. Compatible models include the Losi 1/4 Promoto-MX Motorcycle RTR in FXR (Red) and Club MX (Blue) configurations, as well as the Losi 1/4 Promoto-SM FXR Supermoto Motorcycle RTR. If you own either of these models, this is the official Losi spare parts kit you need for fork maintenance.
- When should I rebuild my motorcycle forks? — Fork rebuilds are typically recommended after 10-20 hours of active riding, depending on riding intensity and track conditions. Signs that a rebuild is needed include reduced damping performance, visible oil leakage from the fork seals, or a noticeably softer or harsher suspension feel. Regular maintenance extends component life and maintains consistent handling characteristics essential for competitive racing.
- Is this suitable for beginners? — Whilst fork rebuilds require some mechanical skill and should be performed in a clean environment to avoid contaminating internal components, the complete kit from Losi includes all necessary parts and reduces the complexity compared to sourcing individual components. Experienced RC enthusiasts and competition racers will find this kit straightforward to use, whilst beginners may benefit from consulting online guides or asking experienced RC motorcycle racers for guidance during their first rebuild.
- What tools do I need for a fork rebuild? — The rebuild kit provides all internal components and fasteners, though you'll need basic hand tools such as small wrenches or hex keys for fastener removal and installation, a clean workspace to prevent contamination, and potentially a fork oil of the appropriate viscosity if your fork assembly requires topping up during reassembly. Consult your Losi Promoto-MX or Promoto-SM manual for specific tool recommendations.
- Can I use this kit for multiple rebuilds? — This single kit is designed for one complete fork rebuild of a Promoto-MX or Promoto-SM motorcycle. If you perform frequent rebuilds or maintain multiple motorcycles, you may wish to purchase multiple kits to have spares available between rebuild cycles.
- How does this compare to aftermarket fork kits from other manufacturers? — This is the genuine Losi fork rebuild kit engineered specifically for Promoto-MX and Promoto-SM motorcycles by the manufacturer. Losi-spec'd O-rings and injection moulded plastic components ensure perfect compatibility and performance that matches factory specifications, whereas generic or aftermarket alternatives may introduce inconsistencies in damping performance or seal durability. Using the official kit guarantees reliability, especially important for competitive racing applications.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Losi Fork Rebuild Kit: Promoto-MX/SM Z-LOS263003 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
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- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
