This is our smallest Big Bore Billet Reed Engine! The 40GT is designed to be a easy to use, affordable and extremely durable big bore RC engine at a fantastic price.


Now shipping with our updated V2 Crankcases and V2 Ignition System: Improved internal transfer flow, updated primary compression ratio,  Japanese Oppama Ignition system with a host of benefits including reduced overall weight and finally improved finishing around 3D milling faces for an even better than our already industry leading machining.


The engine comes WITHOUT a carb or pipe as by popular demand, so you can use any of the Big bore RC pipes on the market or pick up used pipes on the facebook groups.

We have however listed out a number of options so you can build a 40GT Complete top spec package. If you would like any other custom options like anodising, please get in touch.


For Baja or Hybrid Fitment, its highly recommended to use our RCMAX BILLET HD GEARBOX which has been designed for proper clearnace to the back of the engine. If you use other brand gearboxes you will have to sand off the front face of the box to allow clearance.


See it in action here:

Engine spec:

  • 40cc Billet Reed engine (40mm Bore x 32mm Stroke)
  • Custom made lightweight full circle crankshaft 
  • RCMAX Custom GT Triple Exhaust Port Cylinder
  • V2 Oppama Ignition System for less weight, better spark and more reliability
  • RCMAX Reed System (made by Moto Tassanari) with 8 custom high tension carbon-fibre petals.
  • Comes without carb as standard but you can add this.
  • The famous RCMAX Official Hat

    Custom Anodising is available in all colours and even Dual Colour Splash anodising! Please just get in touch after placing an order to discuss.