This is Saito Engines E150B 150B AAC With Muffler:BI. The 1.50S is actually a bored-out 1.20S for an incredible power-to-weight ratio. With over 20% greater displacement, the 1.50S will happily swing an. APC 16x8 prop at 8,800 rpm with 15% fuel.Features: Incredible power—2.5 horsepower APC 16 X 8 over 9,000 rpm. Same dimensions and weight as 1.20-size engines. Stronger and more modern crankcase than the previous version. Specs: Type:4-stroke Displacement:1.50 cu in (25.00 cc) Bore:1.33 in (34.00 mm) Stroke:1.08 in (27.60 mm) Cylinders:Single - Chrome Plated Engine (Only) Weight:30 oz Crankshaft Threads:M8 x 1.25mm Benchmark Prop:16x8 APC @ 8,800 Prop Range:16x8 - 18x6 RPM Range:2,000 - 10,500 Fuel:10%-30% Synthetic Mounting Dimensions:138 x 69 x 134 mm Muffler Type:Cast Cylinder Type:AAC Carb Type:Barrel, 2 Needle Valve Crank Type:Bal Bearing.Condition: Factory NewOperational Status: FunctionalOriginal Box: YesManufacturer: Saito EnginesModel Number: E150BMSRP: $569.99Category 1: Other ToysCategory 2: Radio Control ToysAvailability: Ships in 1 Business Day!The Trainz SKU for this item is P12112136. Track: 12112136 - No Location Assigned - 001 - TrainzAuctionGroup00UNK - TDIDUNK - Oct 10 2015 6:27AM