OS ENGINES DECAL SHEET.

Built for ultra-fast refuelling, the fast fuel gun stands out as the trigger orientation that makes refuelling more ergonomic.

The materials used on the grip have been tested extensively over a
period of time with Arrowmax factory drivers to ensure mechanics get the best grip during refuelling.

MUGEN Air Filter Oil (100ML)

This is an excellent sticky oil to keep dirt and dust from entering your carburettor.

The best method is to pour a small amount of oil in a plastic bag and then put your
filter in the bag and squeeze the filter so the oil distributes throughout the foam.
The oil is very thin so make sure you squeeze any excess oil out before installing on your car.
Once the oil dries it will become very sticky.

NOTE: Wash out your filter after every 2 or 3 meetings. It will help protect your expensive engines!

TQ Bell Bearing Kit for Mugen Clutch Bell

Conical manifold that guarantees easy tuning and low fuel consumption. HT01

This is great for middle to fast tracks were there is normally high fuel consumption.

Hasi Tuned Swiss Steel Rear Ball Bearing for On-Road Engine (14x25.4x6 mm)

NOW DIS-CONTINUED.

Developed after more than a year of testing with our team drivers, this exhaust guarantees better engine operation throughout its range of use, combining a sound without compromises.

Developed after more than a year of testing with our team drivers, this exhaust guarantees better engine operation throughout its range of use, combining a sound without compromises.

HARD COATED VERSION

PACK OF 3

IMPORTANT NOTE: 
After fitting one, or more, of these shims machining work will be needed on the engine squish head.

Failure to do this will result in poor performance.

PACK OF 3

IMPORTANT NOTE: 
After fitting one, or more, of these shims machining work will be needed on the engine squish head.

Failure to do this will result in poor performance.

A conical 90° version (Hard Coated) which offers more torque in the low and middle rpm and is a perfect choice for fast tracks.

A conical 90° version which offers more torque in the low and middle rpm and is a perfect choice for fast tracks.

After many tests, Hasi engines is proud to present its newest development. 
The new backplate reduces friction, improves the flushing inside the crankcase and with that improves the torque in the bottom to mid rpm range. 

HASI TUNED CARBURETTOR RETURN RUBBER BAND

(Black 20 pcs.)

Calibrated Head Shims (0.05/0.10/0.15) for OS & Max Power .21

New Low Profile Head by HASI TUNED, this head in addition to lowering the centre of gravity, due to a saving of 3.8 grams compared to the original.

These heads has been specially produced for engines with AAC liner, as it guarantees a faster and easier warm-up of the engine.

Affordable Liner/Sleeve Remover tool for all OS based .21 nitro engines.

Enlarged fuel window.
Enjoy a wider and more precise tuning range, making carburation faster, easier, and more stable under all conditions.

More control.
Less guesswork.
High-grade stainless steel construction Precision-machined for optimal fuel atomisation inside the carburetor, ensuring better efficiency and improved throttle response at high RPM.

Full compatibility Direct fit for all OS 21M2 series carburettors.

📦 Now available as an optional upgrade for all OS-based engines.

THESE WORK!!!

MAIN JET SEALS.

8mm, 8.5mm and 9mm

Hasi Tuned High Performance Venturi 9.00 mm Ultra Short Version

Fits all OS based carburettors.

Similar design to MAX engine short venturi. Immediate power increase.

Hasi Tuned 9 PORT AAC 2026

Hasi Tuned 7 PORT AAC 2026

CLEAR INS BOX EFRA APPROVED

BLACK INS BOX EFRA APPROVED

PACK OF 6.

SALE SPECIAL - 1 ONLY

• - New high dissipation and low density aluminium cooling head, to  combine functionality and lightweight.
• - New crankshaft, with revised timing and balancing.
• - New piston and liner, 7 PORTS with high compression piston made from rod.
• - New reinforced 'GENUINE OS' conrod.
• - New type Low Profile head - RED.

Each engine will have its own dedicated sleeve, which will be perfectly honed inside the crankcase, avoiding dangerous vibrations; the design of the ports has been revised to combine performance and reliability.

COMES COMPLETE WITH 'PRE-RUN' (Proper running not oil bath!) + Hasi Special Back Plate

Like every Hasi engine, they are numbered one by one and accompanied by a certificate of guarantee and authenticity and the useful engine book.

Hasi Tuned High Quality After Run Oil 50 ml.

IN STOCK NOW.     ** WORLD CHAMPIONS 2019 ** 

Available as Motor only or with OS Pipe & New 'O2' Manifold, Springs and Gaskets. See Drop-Down box.

This New 9-port power plant was developed with this year's IFMAR 1/8th Nitro On-Road World Championship* in mind. It features an updated piston and liner design that increases overall torque, while the DLC coated crankshaft offers improve transition from low to high rpms. The engine also sports a new combustion camber insert with a silicone O-ring, adapted from O.S. Engine’s off-road engines, preventing dust and dirt contamination. The R2104 is rounded off with a new design cooling head in a 2-tone black and red finish with white laser-engraved graphics.

• The cylinder liner uses a new 9 port design
• The cylinder head uses a two-colour anodising 
• Increased fin pitch achieves both cooling performance and weight
  balance
• Equipped with 21M2 (B) slide carburettor.

Specification

Available as Motor only or with OS Pipe & New 'O2' Manifold, Springs and Gaskets (saving over £80) 
See Drop-Down box.

ONE LEFT WITH MAXIMA MODIFIED BACK-PLATE

Maxima MX Europa have introduced their new .21 engine for 1/8 On-Road class, the Maxima Mx R6.

Over the past years several tests have been done with Mx R2 and Mx R4 to get to the R6,
with all the quality standard of our engines and overall performance regarding torque and runtime.

The Mx R6 is based on O.S Speed R2103 with special factory modifications to Crankshaft, Liner and
Piston and comes 'Pre-Run' to shorten the running in process by half!

Main Features: 
Lower Centre of gravity for better handling
• A second inner button head allows for finer tuning to meet track conditions
• New ceramic rear bearing reduces friction loss 
• Compatible with 16% nitro fuel, which complies with EFRA regulations
• Retains O.S Speed innovations such as DLC coating and tungsten weighted crank shaft

Power with Economy! 

All motors are factory selected, tuned and modified by Maxima.

PLEASE NOTE:
ALL MAXIMA MOTORS ARE SUPPLIED PRE-RUN USING OIL BATH METHOD (Not fully run-in)

INS-BOX Air Filter and Intake Silencer. 

Suits all .21 On-Road motors.

MX-21 351 9 Port 14.5mm Crankshaft.

Ceramic Bearing Rear 14.5mm

California Head.

ABC Piston & Liner.

NOTE: Extras included in this price:

• DLC COATED CRANKSHAFT

• BLACK Coated Crankcase

In stock Now.

THE 2025 WORLD CHAMPIONSHIP WINNING MOTOR IN 

TAKAHATA SHOKI'S MUGEN MRX7.

ALSO USED BY DARIO BALESTRI TO WIN THE 2025 EUROS

• MX-21 351R 9 Port 14.5mm Crankshaft.
• Ceramic Bearing Rear
• QUADRIFOGLIO head.
  
• AAC Piston & Liner
• DLC Coated Crankshaft.

  
  
  

  In stock Now.

OS Quality in an Affordable package.

High Performance for a budget price.

Featuring improved torque at medium to low speeds, the throttle response has also been improved.

This has been achieved through a newly designed crankshaft with different counter weight shape which has had two tungsten weights installed for improve performance.

The cooling head has also been changed to improve cooling, while the button and its o-ring has been modified to prevent dust entering this area.

• New inner crankshaft.
• New Cooling-head increased cooling.
• New combustion chamber/o-ring.

New Pipe & Manifold: 1070SC(EFRA2672)/MT03

IN STOCK NOW.

The BRAND NEW EUROSPEC II Motor from OS Engines.

(Price does NOT INCLUDE Pipe & Manifold.)

• NEW CRANKSHAFT. Featuring an extra Tungsten counter balance weigh to improve mid range performance and 'return to idle' function. 
• NEW LINER & PISTON. 7 ports (similar to Shimo II) for a smoother power delivery with increased torque. Exhaust side extra liner ports to improve piston cooling and a better heat distribution.
• New Head Graphics.

We proudly present the O.S. SPEED R21 Shimo3 Edition, developed in collaboration with Takaaki Shimo, multiple podium finisher at the IFMAR 1/8 Racing World Championship.

This 9-port engine features a specially treated piston and a newly matched cylinder for enhanced durability and longer lifespan.

The LGC cooling head and 8.5mm carburettor restrictor are anodised in a distinctive colour exclusive to this edition.

Additional upgrades include a new Dust Cover Ring and Exhaust Spacers to fine-tune engine performance to your preference.

This package comes complete with the latest EFRA2196 tuned muffler and its MR05 manifold, making it a truly special edition for performance enthusiasts.

NEW

OS .21 TUNED PIPE TR02 EFRA2165

Developed for smoother Low end and Midrange performance whilst retaining good Top End.

NEW!   IN STOCK NOW!

The New tuned silencer TR02 EFRA2165 kit supplied with
the MR02 manifold, designed for 1/8th on-road engines.

Improved bottom end and mid range power, making for
smoother acceleration and better control.

Requires slight mixture change. Up to 1/4 turn richer.

P-Line Muffler Glove is a special protective grease resistant to high temperatures (-35°C +270°C).

Apply by spraying Muffler Glove generously directly onto the exhaust, simulating a paint job.
For best results, we recommend applying two coats of release agent).

After use, any rubber residue that adheres can be easily removed with a simple cloth and without any effort.

One application lasts for more than 12 hours.

NO MORE HOURS SPENT CLEANING THE BURNT ON CRAP ON YOUR EXHAUSTS!

A **MUST HAVE** for every nitro racers toolbox

Large 400ml spray can for ease of use.

The new benchmark in professional cleaning for RC micromotors arrives.

🎯P-Line Fast Cleaner – Code: PG16206 Designed by Pepe Group to meet the highest standards in the RC industry.

💥High-performance technical cleaner for internal and external use of micromotors:
✅Degreases deeply
✅Zero residues
✅Safe on silicones and plastics – designed not to damage them
✅Specific formula for the RC sector 🧪Tested to satisfy the most demanding professionals and pilots.
🚀600 ml format with constant high pressure delivery: maximum effectiveness from the first to the last spray.

⚙️It's not just a degreaser. It's the ultimate technical cleaner for the RC world.

CARB/BELLOWS SLIDE DUST COVER and SEAL.

Fits all OS Based .21 Motors.