Overview
The HoBao Sub Throttle Needle Valve H21055 is a precision engine tuning component designed specifically for nitro-powered RC cars and trucks. This low-speed needle valve is an essential spare part for enthusiasts who demand peak performance from their fuel-powered RC vehicles. Whether you are running a competitive RC buggy UK setup or maintaining your weekend basher, this OEM HoBao component ensures your engine delivers consistent power and optimal throttle response across all driving conditions.
As a dedicated low-speed needle for HoBao's 21-28cc engine range, this component plays a critical role in fuel mixture management at lower RPMs. The needle valve controls the precise amount of fuel entering the engine's carburetor at idle and low-speed operation, which directly impacts engine smoothness, reliability, and overall performance. For serious nitro RC enthusiasts in the UK, having quality spare needles on hand is essential maintenance practice, ensuring you can always keep your engine running at peak efficiency.
This is genuine HoBao manufacturer part H21055, confirming it meets OEM specifications and quality standards. It is compatible with several popular HoBao models including the Hyper 7 TQ2 RTR Buggy and the Hyper ST Truggy range, making it an ideal addition to your RC spares collection. Whether you are fine-tuning your engine setup for maximum performance or simply maintaining your existing equipment, this low-speed needle valve is the correct choice for HoBao nitro engine owners.
Key Features
- OEM HoBao Component — This is a genuine manufacturer part produced by HoBao, ensuring it meets exact specifications and quality standards required for optimal engine performance in your RC car or truck.
- Low-Speed Needle Design — The needle is specifically engineered to control fuel mixture at low RPMs and idle speeds, providing smoother throttle response and better engine control during slow-speed maneuvres and technical driving sections.
- 21-28cc Engine Compatibility — This needle is designed for HoBao's medium-displacement nitro engine range, making it suitable for buggies, truggies and other nitro-powered RC vehicles in this engine class.
- Precision Tuning Control — Allows you to fine-tune your engine's low-speed fuel mixture with precision, optimising combustion efficiency and helping achieve the perfect balance between power and fuel consumption.
- Essential Spare Component — Every serious nitro RC enthusiast should maintain spare needles, as these components wear over time and can become damaged through normal operation, making replacement essential for keeping your engine running smoothly.
- Easy Installation — As a direct OEM replacement, installation is straightforward for anyone familiar with basic nitro engine maintenance and tuning procedures.
Technical Performance
The HoBao H21055 low-speed needle valve represents precision engineering designed to optimise nitro engine performance across the full RPM range. This component is engineered for HoBao's 21-28cc displacement engines, which are commonly found in competitive and recreational RC buggies and truggies throughout the UK. The needle valve mechanism controls the fuel-air mixture at low speeds and idle conditions, which is critical for smooth acceleration from standstill, precise throttle control during technical driving sections, and overall engine stability. Constructed to OEM specifications, this spare component ensures your engine maintains the exact calibration required for optimal performance. Nitro RC engines are highly responsive to fuel mixture adjustments, and having a quality low-speed needle ensures your tuning efforts translate into tangible performance gains. The precision machining of this needle allows for micro-adjustments to fuel delivery, enabling experienced drivers to dial in their engines for specific track conditions, weather, and fuel types. Regular maintenance and occasional replacement of wear components like needle valves is essential practice for anyone serious about keeping their nitro RC vehicle performing at its best.
What's in the Box
- HoBao Low Speed Needle Valve H21055
Frequently Asked Questions
- What is a low-speed needle valve and why do I need one? — The low-speed needle valve controls the fuel mixture at idle and low engine RPMs. It is a wear component that gradually degrades through use, and having a replacement ensures your engine maintains smooth, consistent low-speed running characteristics essential for precise throttle control in RC racing and recreational driving.
- Is this needle compatible with my HoBao RC vehicle? — This H21055 low-speed needle is compatible with several HoBao models including the Hyper 7 TQ2 RTR Buggy with Mac 28 Turbo Engine, the HoBao Hyper ST Truggy Pro, and the HoBao Hyper ST Truggy RTR. Check your vehicle documentation to confirm compatibility before purchase.
- How often should I replace my low-speed needle? — The low-speed needle valve is a wear component that requires periodic replacement depending on your usage. Regular nitro RC drivers typically replace needles every 1-2 seasons of heavy use, or whenever engine tuning becomes difficult or unstable.
- What is the difference between low-speed and high-speed needles? — The low-speed needle (this component) controls fuel mixture at idle and low RPMs, whilst the high-speed needle controls mixture at full throttle. Both are essential for complete engine tuning, and both wear over time and require occasional replacement.
- Can I install this myself? — If you have experience with basic nitro engine maintenance and carburettor adjustment, installation is straightforward. However, if you are unfamiliar with nitro engine tuning, we recommend having it installed by someone with experience to ensure correct setup and calibration.
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 HoBao Sub Throttle Needle Valve H21055 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.
- Brand: HoBao
- Part Number: H21055
- EAN: 4711605967730
- Component Type: Low-Speed Needle Valve
- Engine Compatibility: 21-28cc displacement
- Compatible Vehicles: HBM7-TQC28DG Hobao Hyper 7 TQ2 RTR Buggy with Mac 28 Turbo Engine, HBM7-ST-PRO HoBao Hyper ST Truggy Pro, HBM7-ST HoBao Hyper ST Truggy RTR
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.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
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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.
