This is the O.S. GT55 Gasoline Engine with Electronic Ignition.

FEATURES: Produces 20-30% more power than any other engine in its class
          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 to ensure consistent quick starts, also
            requires minimum current in stand-by mode and features a low
            voltage warning (intermittent engine operation)
          Front mounted WLA-2 carburetor stays cooler for less heat
            percolation and more consistent performance, simple and direct
            throttle and choke linkages
          Unique one-piece crankcase eliminates gaskets and enhances strength
            and precision
          Front induction rotary valve crankshaft design for positive opening
            and closing of valve for optimum timing, no oil seal required which
            eliminates RPM loss due to 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 through Hobby Services beginning at date
            of purchase

INCLUDES: O.S. GT55 Gasoline Engine with Electronic Ignition, Carburetor, CM-6
            Spark Plug, Prop Washer with four 5x40mm Socket Head Cap Screws,
            Exhaust Gasket and Instruction Manual

REQUIRES: Propeller: 22x8 for break-in
            22x10, 23x8, 23x10, 24x8, 24x10 for sport/acro/scale use
          Two-Cycle Oil: Break-In, Klotz Modelube recommended, mix at 30:1
            gas/oil mixture for 10 flights, 1.3 - 1.6 gallons (5-6 liters) of
            gas
            After Break-In: mix at 50:1 ratio, See COMMENTS below
          Electric starter NOTE, The propeller must be brought up to at least
            100RPM in order for the electronic ignition to work
          Muffler: See COMMENTS below
          Fuel: Unleaded regular gasoline (no need to use high octane)

SPECS:    Displacement: 54.9cc (3.35 ci)
          Bore: 1.62" (41.2mm)
          Stroke: 1.62" (41.2mm)
          Output: 5.5 PS, 5.42 HP/7000 RPM
          Practical RPM: 1,500 - 8,000
          Weight: Engine 1,580g (55.7oz)
                  Igniter 140g (4.9oz)
                  Muffler 6.28oz (178g)
          Carburetor Settings: Two turns out on high and low speed needles from
            fully closed position, then start engine and follow break-in
            instructions on pages 18-25 in manual

          Distance/center of Mounting Standoff Holes Top to Bottom: 2.6" (66mm)
          Distance/center of Mounting Standoff Holes Side to Side: 3.1" (78mm)
          Distance/center/Mounting Standoff Holes/Crankshaft Center:1.3" (33mm)
          Height/bottom of Mount to Top of Cylinder Head: 7.1" (180.4mm)
          Height/center of Crankshaft to Top of Cylinder Head: 5.5" (139.2mm)
          Width at Cylinder Head: 2.9" (75mm)
          Center of Crankshaft to Center of Exhaust Outlet: 2.9" (74.6mm)
          Length from Mount to End of Drive Spacer: 5.9" (150mm)
          Length from Mount to Crankcase Center: 1.5" (37.5mm)
          Thread size of pilot shaft for spinner bolt 5mm

COMMENTS: If using a different brand of oil other than Klotz, OS recommends
            their own mix ratio which may differ from the manufacturers'
            For 40:1, and 50:1 oils, OS recommends a 30:1 gas/oil mixture

          25:1 is 5oz of pre-mixed 2-cycle oil or 151 ml per gallon of fuel
          30:1 is 4.3oz of pre-mixed 2-cycle oil or 126 ml per gallon of fuel
          40:1 is 3.2oz of pre-mix 2-cycle oil or 95 ml per gallon of fuel
          50:1 is 2.6oz of pre-mix 2-cycle oil or 76 mll per gallon of fuel

          The following mufflers are ideal for different applications;
            J'TEC Large Wraparound Pitts Muffler, JTCG7950 for inverted
            mounting applications.
            Bisson Wraparound BISG9250, and Inverted BISG9251 mufflers will
            also fit.
            Slimline offers the following,  #2125 Inverted Pitts Muffler,
            #2156 Side Canister, and #2155S w/Smoke System.

                                                                   jxs 10/15/09
                                                                         ir/jxs
                                                              updt jxs 03/17/10
                                                              updt jxs 04/20/10
                                                              updt jxs 10/12/10
                                                              updt jml 10/11/11