AMR O.S. 2103 Type S Engine


Available on backorder

SKU: AMR1001 Category:


O.S. Speed B2103 Type S .21 Competition Nitro Engine

AMR offers the complete package. They take a proven engine and add simplicity and efficiency for the customer. First they Start off with adding their Proven AMR Back plate. This updated backplate increases runtime which can be helpful during long mains. Once the Back Plate is installed, they run it through their EBIS Break-in machine. this makes starting the engine for the first time a breeze. A few Break-in tanks are still needed once in the car, but this saves a lot of time by getting passed the idling stage of break in.

** These engines are ordered as needed so please order accordingly. Ship date generally is one week from order date.**


  • AMR OS 2103 Type S Engine
  • AMR Back Plate
  • Stock 2103 Back plate
  • EBIS Break-in service

***Manufacturers Information***

The O.S. Speed B2103 Type S Buggy Competition Engine with the T-2100SC Pipe gives you the advantages and options expected of a competition grade power plant. O.S. has created a product that will evolve to meet driver preferences and course layout.

This model has a re-designed crankcase, engraved with the “O.S.” Logo featuring an updated cooling fin with enough surface area for effective heat dissipation that gives the buggy engine a powerful look. This S Type has high vertical finned, low-profile cooling head with low gravity for improving the cars handling. The crankshaft has been updated to optimize the rotational mass and follows the O.S. SPEED tradition with a DLC coating to reduce friction, dual tungsten slugged counter-balance and a ceramic rear bearing to reduce vibration and increase RPM. The inner head has a silicon O-ring for improved vibration reduction and better dust resistance, and a three port sleeve that will perform well at medium and low speed ranges.


This engine also features the 22D carburetor which emphasizes quick response and smooth acceleration. This engine includes 6mm and a 6.5mm venturis and a re-designed ball link which allows a change in the position of the fixing screw for easier access.



· Crankcase with engraved “O.S.” Logo

· Three – ports liner, ideal for medium and low speed range

· Silicon Inner Head O-Ring

· 22D carburetor for quick response and smooth acceleration

· A designed ball link to allow changes in the position of fixing screw for easy access

· DLC Coated Crankshaft with Tungsten weights and potted with silicone

· O.S. Speed parts are available for updating the outer and inner heads, crankcase, crankshaft and more

· Includes the P3 turbo plug

· Two Venturis (6mm & 6.5mm)


Displacement: 0.213 cu (3.49 cc)

Bore: 0.64″ (16.27mm)

Stroke: 0.66″ (16.80mm)

Practical RPM: 4000-42000 rpm

Power Output: 2.68PS, 2.64HP @34,000 RPM

Weight: 12.42 oz (352 g)

Crankshaft Size: UNF1/4-28


Due to the nature of this sport/hobby, all items and services are sold As-Is and are non-refundable. However, we care about our customers and want you to be satisfied with your purchase.  If you have any issues with your order, please contact us by email at: or send us a message on our Facebook page: AMR Engines.

Additional information

Weight 1 lbs
Dimensions 8 × 6 × 4 in