Features
Two sealed bearings on crankshaft-simple design for lighter weight
Beam mounting allows easy fit in the same mount as comparable glow
engines
Aluminum alloy crankcase with advanced CNC machining
Rear mounted pumper carburetor ensures easier installation and smooth
idling and dependable fuel flow during flights
Fully automatic electronic ignition
Two year limited warranty through Hobby Services beginning at date
of purchase

Specifications
Output Power: 2.5 HP at 9,000 RPM
Idle Speed: 1,750 RPM
Static Thrust: 6 kg Pulling Force/100 meters altitude
5.3 kg Pulling Force/1,800 meters altitude
Displacement: 1.22cu in \(20cc\)
Bore and Stroke: 1.3 x 1.0" \(32 x 25mm\)
Compression Ratio: 10.5:1
Weight: Engine: 22.93oz.\(650g\)
Exhaust: 1.76oz \(50g\)
Ignition: 4.23oz \(120g\)
Total: 28.9oz \(820g\)
Gasoline/Oil Mixture: 30:1
Gasoline Octane Rating: 87-93
Recommended Propellers: 14x10, 15x8, 16x6, 16x8, 17x6, 18x6
\(break-in prop not specified\)
Ignition Battery: 4.8V min,max as marked on electronic ignition unit.
If marked 6V max, BEC required if LiPo battery used.
Newer ones may be marked 4.8V to 8.4V.
Replacement Spark Plug: CM3, DLEG2126
Spark Plug Gap: 0.018 - 0.020"
Plug Installation Torque: 7 - 8ft-lbs
Carburetor Adjustments;
Low Speed Needle: 1.5 turns out as a starting point, adjust for a
smooth idle and a reliable transition to high throttle
High Speed Needle: 1.5-2 turns out from closed, adjust needle to peak
RPM, if engine slows or dies at full throttle, the high-speed
mixture is likely too lean
Height from bottom/Crankcase to top of

Head: 5.4" \(138mm\)
Height/bottom/of Mounting Tab to top of Cylinder Head: 3.4" \(87.5mm\)
Width of Cylinder Head: 2.5" \(65mm\)
Width at Mounting Tabs: 2.8" \(70.5mm\)
Distance/Mounting Hole Centers Same Side: 1.0" \(26mm\)
Distance/Mounting Hole Centers Opposite Side: 2.4" \(60mm\)
Height of Exhaust Opening: 0.42" \(10.8mm\)
Width of Exhaust Opening: 0.83" \(21mm\)
Length from Carburetor to Front Bearing: 4.5" \(114mm\)
Length from Carburetor to Prop Hub: 5.1" \(130mm\)
Total Height of Muffler including Exhaust Pipe: 3.8" \(96mm\)
Center of Muffler Exhaust Opening to end of Pipe: 2.4" \(61mm\)
Muffler Width: 2" \(52.1mm\)
Exhaust Pipe Inner Diameter: 0.56" \(14.2mm\)
Crankshaft thread size: 8mm x 1mm