DMS Racing Web Store

Our Manufactures

Site Secured by WorldPay

WorldPay Logos

Shopping Cart

Ruddog RNX21.3 - 3 port .21 size engine (with storage bag)

Rating: Not Rated Yet
Manufacturer: Ruddog Products

Part No: RP0300

Stock Level: 1

Price: £389.99

RUDDOG RNX21.3 3.5ccm Nitro Offroad Competition Engine

The RNX21.3 is RUDDOG Distribution’s first high-performance nitro off-road engine. The high-quality 3.5cc competition engine features as specially developed crankcase for exceptional performance and great fuel economy with a rear ceramic main bearing and a DLC-coated and Tungsten-balanced crankshaft ensuring very high power output and reliable performance. The engine is of a 3+1 port long-stroke design for high yet controllable torque especially in the lower RPM ranges, making it ideal especially for smaller or technical tracks. Other features include a 22D carburetor for smooth throttle response and high fuel economy while an O-ring equipped combustion camber insert keeps dust away from the delicate parts of the engine. The engine is rounded out by a gold-colour cooling head whose standard height allows to run the engine leaner, extracting ever greater milleage from the engine.


  • Standard height cooling head for exceptional heat dissipation
  • Specially developed crankcase for high performance and improved milleage
  • 3+1 port design for high torque in the low to mid RPM range
  • Tungsten-balanced and DLC-coated crankshaft
  • Ceramic main bearing
  • 3-needle carburettor
  • 6.0mm and 6.5mm venturi insert included
  • Including engine storage bag


  • Displacement: 3.49cc
  • Bore: 16.27mm
  • Stroke: 16.80mm
  • Ports: 3+1
  • Carburettor: Sliding
  • Power output: 2.68PS @ 34,000RPM
  • RPM range: 4,000 - 42,000RPM
  • Weight: 352g


There are yet no reviews for this product.

Contact Us

DMS Racing
418 St Albans Road
WD24 6PJ

Telephone: 01923 816636

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Opening Hours

Mon to Wed : 10am -5.30pm
Thursday : 10am - 7pm
Friday : 10am - 5.30pm
Sat & Sun : CLOSED

Public and Bank Holidays : CLOSED


Follow us on Facebook

Follow Us On Facebook Image Link