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   This is the 1.20 Rear Needle Valve Ringed engine without muffler from GMS.
    It features a one-piece head with a hemispherical combustion chamber for
      increased power, large crankshaft for balance and strength, and top
        quality ball bearings, all backed with a full TWO YEAR warranty.

FEATURES: Hemispherical combustion chamber
          Rear-mounted, remote needle valve reduces chance of injury from
            spinning propellers
          One-piece cast crankcase with "bead-blasted" finish
          Cylinder head machined from aluminum bar stock and anodized gold
          Carburetor features 2 needles for independent High & Low adjustments
          "Dykes" piston ring design

INCLUDES: One 1.20 GMS engine
          One carburetor
          One remote needle valve and bracket
          One glow plug w/copper washer
          One 3mm allen wrench
          One 1.5mm allen wrench
          One instruction manual
          One exploded view/parts list

REQUIRES: Muffler, bolt-on style (GMEG4880)
          Attaching remote needle and bracket
          Fuel with 18% (minimum) lubricant content and 10%-15% Nitromethane

SPECS:    Displacement:        19.9cc  (1.20 cid)
          RPM range:           1800-14,000 RPM
          Bore:                30mm    (1.18")
          Stroke:              28.2mm  (1.11")
          Weight:w/o muffler, carb, drive washer, prop washer glow plug or nut
                               750g    (26.5oz)
                 w/muffler     879g    (31oz)
          Horsepower:          3.3BHP @ 13,000 RPM
          Length: Backplate screw to front of drive washer:     110.5mm (3.74")
                  Between centers of the mounting holes            30mm (1.18")
          Width:  Width neglecting engine mounting flanges         50mm (1.97")
                  Distance between centers of the mounting holes   60mm (2.36")
          Exhaust mounting screws width (center to center):        40mm (1.58")
          Height:                                                 120mm (4.72")
          Crankshaft Thread Size:                                 3/8-24
          Crankshaft Length from front of drive washer
                  to front of crankshaft:                        35.6mm (1.40")
          Crankshaft Threaded Area:                                22mm (0.87")
          Suggested Prop: Sport                                    16x10
                          Racing                                   16x8
                          Scale                                    18x5, 18x6

          High Speed Needle:  1½ turns OUT from closed
          Low Speed Needle: 2 turns IN from flush with throttle arm

COMMENTS: A .078" wire (not included) can be used to extend the needle valve by
            inserting the wire into the pre-drilled hole on the end of needle
            valve and tightening it in place with the supplied set screw.
          All GMS engines use the same owner's manual

                                                                     NNA 8/2/03
                                                                         ir/jxs
                                                              updt jxs 12/28/04
                                                               updt lmm 3/27/09



– If you need more information, use these GMS Engines resources –

Click Here: Manufacturer's Product Web Page
Phone: 217-398-8970


 
Postal Address:
GMS Engines
1610 INTERSTATE DRIVE
CHAMPAIGN, IL 61822  








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