Introducing the first O.S. gas engine—designed especially for R/C!

It's similar in appearance to other O.S. 2-cycle engines, with a large number of extra-deep and -thin cooling fins on the crankcase and head. A unique 1-piece crankcase design eliminates gaskets and enhances strength and precision.

A unique front-mounted carb, however, provides several performance benefits.

• Better carburetor cooling, for more consistent engine runs and high performance.
  
  
• Requires shorter standoffs, which results in more secure installation (mounting) and less vibration overall.
  
  
• Very simple, direct installation of the throttle and choke linkages.

The GT55 produces 20-30% more power than any other engine in its class!

Another major performance benefit is the IG-01 Capacitive Discharge Ignition. Developed from proprietary O.S. technology, it uses a microcomputer programmed for optimum spark advance. Magnetic sensors on the crankcase and prop drive detect ignition timing. The IG-01 also detects and compensates for wet plugs, ensuring quick starts. Designed to accept a wide range of input voltages, the IG-01 requires minimal current in standby mode and features a low-voltage warning (intermittent engine operation). Note: the ignition module (IG-01) supplied with the engine is not set up to work below 100 rpm. Owners need to get the prop up to 100 rpm or more before the electronic ignition will work.

Other benefits include:

• No oil seal is required, eliminating rpm lost due to additional friction.

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