O.S. GT55 Gas Engine

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O.S.^® GT55 Gas Engine

Features

Massive front and rear bearings add to the GT55’s long life and maximum power output.

A front-induction, rotary-valve crankshaft ensures optimum tuning.

A thin, high-performance piston ring and high-strength aluminum alloy piston shorten the break-in process, allowing high compression from the very first run!

The first O.S. gas engine developed especially for R/C!

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Over 2 years in the making, the GT55 offers gas modelers 20-30% more power than the competition and the fit and finish O.S. is known for. Its Walbro® pumper carb is front-mounted for better cooling and more consistent performance. The ID-01 electronic ignition system is an O.S. exclusive which compensates for wet plugs. A microcomputer and a front-induction, rotary-valve crankshaft ensure optimum timing at any throttle setting.

IG-01 Capacitive Discharge Ignition uses a microcomputer programmed for optimum spark advance. Through the use of magnetic sensors on the crankcase and prop drive, the IG-01 also detects and compensates for wet plugs, ensuring consistent 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).

Front-mounted carburetor releases less heat and delivers more consistent performance
Simple and direct installation of the throttle and choke linkages
Unique one-piece crankcase eliminates gaskets, enhancing strength and precision
Front induction rotary valve crankshaft design for positive opening and closing of valve for optimum timing. No oil seal is required, eliminating RPM loss from additional friction

Massive front and rear crankshaft bearings for longer life and maximum power output
Thin high-performance piston ring and high-strength aluminum alloy piston for reduced break-in and high compression from the very first run
Two-year limited warranty beginning at date of purchase

Specifications

Displacement: 3.3 cu in (55 cc)
Bore: 1.6 in (41.2 mm)
Stroke: 1.6 in (41.2 mm)
Practical rpm: 1,500-8,000

Engine weight: 3.5 lb (1,580 g)
Igniter weight: 4.9 oz (140 g)
Requires: 20x10-22x10 or 24x8 prop, Standard unleaded gasoline mixed with 2-cycle oil