OPS 60cc Maxi Super Twin Boxer Engine 8970

One hot OPS twin from Monza in Italy!

A state of the art vintage 2-stroke, twin cylinder boxer engine, the pinnacle of Italian model engineering, popular in RC aerobatics championships, including successes in the Tournament of Champions in Las Vegas

This is a long stroke engine, great for turning big props, with excellent fuel economy. Some key features of this engine:

  • Crankshaft with needle roller bearings, at both big end & small end, which allows running with lower oil content
  • Dellorto carby with regulator. Designed & built with model airplane aerobatics in mind,  smooth idle, fast pick-up transition to full speed & provides snappy throttle response through the entire RPM range. This carb should not to be confused with the garden machinery carbs fitted to so many RC gas engines these days, which are designed for running at 2 speeds only (idle speed and flat out for weed whacking, chainsaw, etc)
  • True boxer configuration, with simultaneously firing pistons, which means the forces are always equal & opposite, resulting in a much smoother running engine
  • Reed valve induction. Allows this engine to be run in either direction, counter-clockwise or clockwise (reverse direction) & provides higher levels of torque with a flatter torque curve
  • Renowned for easy starting, usually with one flick (backwards flick technique)
  • Gilardoni Nikasil coated schnuerle ported cylinders, with ringed pistons, timed for torque for use in aerobatics & scale models. Gilardoni also supply the Nikasil cylinders for the BMW boxer twin motorcycles & these quality cylinders are renowned for longevity, regularly exceeding 100,000 miles

Tech specs:

  • Cubic capacity 59.5cc
  • Bore: 32mm
  • Stroke: 37mm
  • Weight: 2600g
  • Fuel mix: 20:1 fuel mix (95% methanol & 5% castor oil). Do not exceed 5% oil content
  • Recommended props: 22x12", 24x10", 24x12" (22x8" for running-in). Can pull larger props if fitted with tuned pipes

This engine can be run with the recommended methanol based fuel or could be run on gasoline petrol using the OS G5 "GAS" glow plugs (available for $9.95 each on ebay), or the Enya Gas Petrol glow plugs, without the need for electronic ignition. The Dellorto carb on this engine has a regulator which would be conducive for use with gasoline petrol, so the setting will be less sensitive for gasoline than without a fuel regulator. The carb has separate settings for high speed ("H" needle screw) & low speed ("L" needle screw). Electronic ignition can also be used & many kits are available on ebay for use with boxer engines with 1/4" spark plugs (same size fitting as glow plugs), such as the NGK ME8, Evolution, Rcexl, etc

This engine is as new, unused & comes with headers / manifolds, tools, papers, box (shelf worn) & packaging. This engine turns overs smoothly with new engine compression making the correct sounds

The engine is perfect for display as an Objet d'art or for use in a large scale or aerobatics model

International bidders are welcome! I will ship the engine to use at cost & please contact me for an accurate shipping quote to your country, as international shipping costs vary considerably by country

Don't forget to check out my other items listed on eBay for more vintage OPS, OPS 5277 tuned pipes for use with this engine, Rossi, NovaRossi, Picco, Super Tigre...

Happy bidding & good luck!



Please note the item is for sale by a private individual & in accordance with section 2.18 of the DTI (Department of Trade & Industry) OFT (Office of Fair Trading) Distance Selling Guide Sept 2006, the guidance for UK implementation of the EU consumer DSR (Distance Selling Regulations), so this item is NOT subject to return nor refund. By placing a bid on this item you fully understand (1) no return of item, (2) no refund for said item & (3) stated postage & packing charges.  Most hobbyists understand that even some manufacturers in this hobby do not accept warranty claims due to "the nature of the hobby" & set their expectations accordingly