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This is a .25 2-Stroke Airplane ABC Engine w/ Front Needle Valve from GMS.
FEATURES Low Speed needle-equipped carburetor with front-mounted High Speed needle valve Aluminum Brass Chrome piston/sleeve construction Adjustable exhaust outlet on muffler allows 360° rotation of muffler tip Gold anodized heatsink head. Ball bearing-supported crankshaft One piece crankcase with a bead-blasted finish 2 year warranty on all GMS engines
INCLUDES:
One .25 cid (4.07cc) airplane engine
One bolt-through muffler
One carburetor
One muffler gasket
One glow plug
Two allen key tools
Two muffler screws
One manual and parts list
REQUIRES: 5-15% airplane nitro fuel. 8x4 propeller for break-in
SPECS:
Displacement: .25 cid (4.07cc)
Bore: 18mm Stroke: 16mm
Output: .85 BHP at 18,000 RPM Practical range: 2,400 - 19,000 RPM
Weight: 10.9oz (310g) with muffler
Center distance width across mounting holes: 1.5" (38mm)
Distance between mounting holes same side: 0.59" (15mm)
Length from front of crankcase to backplate screws: 3.0" (77.7mm)
Width across mounting flanges: 1.8" (45mm)
Total height of engine: 2.92" (74.2mm)
Length from center of head to front of crankcase: 2.2" (55mm)
Widest width of crankcase neglecting mounting flanges: 1.8" (45mm)
Length from front of crankcase to center distance of front mounting hole: 1.87" (47.5mm)
Height from crankshaft center to top of head: 2.3" (59.2mm) Crankshaft thread size: 1/4-28
Factory Settings: High speed: 1½ turns OUT Low end: 2mm gap Idle speed: N/A- adjusted through throttle
COMMENTS:
Propeller size range: 7x6-8x6 For the GMS .25 engine
All GMS engines use the same owner's manual If using the Slimline Pitts muffler (SLIG2216) you must use the screws that come with muffler.
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GMS Dimensions reference chart
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GMS 25
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GMS 32
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GMS 40
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GMS 47
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GMS 61
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GMS 76
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GMS 120
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A
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38
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38
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44
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44
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52
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52
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60
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B
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15
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15
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17.5
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17.5
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25
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25
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30
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C
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77.7
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77.7
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87.3
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87.3
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103
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103
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110.5
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D
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45
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45
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51.5
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51.5
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61
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61
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70
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E
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74.2
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76.8
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87.3
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87.3
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101
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101
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120
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F
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55
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55
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61.8
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61.8
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73.5
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73.5
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77.5
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G
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30
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30
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35.7
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35.7
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43
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43
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50
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H
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47.5
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47.5
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53
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53
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61
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61
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62.5
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J
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59.2
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61.8
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71.2
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71.2
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79.5
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79.5
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95
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S
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UNF1/4
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UNF1/4
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UNF5/16
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UNF5/16
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UNF5/16
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UNF5/16
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UNF3/8
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