OS ENGINES DECAL SHEET.

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.

GENUINE OS GLOW PLUGS.

No' 7 (.21 cool to warm weather)

The 2018/2019 World Champion engine.

CHARACTERISTICS :

• Performance certified by Naoto Matsukura, 2019 IFMAR 1/10 touring car world champion.
• New inner crankcase.
• New Cooling-head increased cooling.
• New Carburettor.
• New rear-cover.
• New piston/liner.
• New piston clip exhaust side c-shape.

Special price on existing stock only.

O.S. SPEED R21 'EURO SPEC' -  developed from the ultra succesfull 2102 & 2103. 

1/8th On Road Motor

It features a newly designed piston and liner developed for the 1/8th Euros 2018.... 
Two holes in the piston help reduce weight, improve cooling and gas flow. 

Displacement: 3.49cc(0.213cu.in.) 
Bore: 16.08mm (0.633in.) 
Stroke: 17.2mm (0.677in.) 
Practical rpm range: 4,000 - 45,000rpm 
Max. output: 2.8ps(2.76hp) 


YMC Tuning improves the 'Efficiency' of the motor even further. 
Better High End and Midrange Performance are some of the benefits. 
We can also offer a 'Pre-Run' service which helps shorten the running in period Dramatically'!

IN STOCK NOW

5% off.

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

OS Engines (Japan) have developed O.S.SPEED R21 Shimo edition in collaboration with Takaaki Shimo, a multiple podium winner of the IFMAR 1/8 Racing World Championship.
It is a 7-port engine with a new cylinder liner, which has extra holes to reduce overheating. The cooling head and 8.5mm carburettor restrictor are anodised in the special colour; champagne gold.
The crankshaft is modified to meet his preference for smooth power transition from bottom to the top speed. For the first time OS Engines supply the combination of TR02 (EFRA2165) silencer with MR03-WC manifold to dedicate to this special edition.

STOCK EXPECTED EARLY OCTOBER 2021

Displacement：3.49 cc / 0.213cu.in.
Bore: 16.08mm / 0.633 in.
Stroke:17.20mm / 0.677 in.
Output 2.8 ps / 2.76 hp / 35,000 r.p.m.
Practical rpm range: 4,000-45,000 r.p.m.
Weight:340g / 11.99 oz.
Standard accessories：
Glow plug RP7 /Dust cap set/Exhaust seal ring
TR02 EFRA2165 /MR03-WC Silencer & Exhaust Manifold
O.S. SPEED Flywheel Colette.

IN STOCK NOW.

The BRAND NEW EUROSPEC II Motor from OS Engines.

(Price iDOE NOT nclude 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.

NEW

OS .21 TUNED PIPE TR02 EFRA2165

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

NEW....NEW....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.