ALPHA D5 ENGINE SPECDisplacement:3.49ccBore:16.26mmStroke:16.8mmPractical R.P.M.:4000~41000rpmPower Output:2.860PS/39500rpmWeight:about360gPorts:3portsSleeve:ABCCrankshaft Diam:14mm diameterCrankshaft:Anti-friction Crankshaft with Silicon FilledGlow Plug Type:TurboExhaust:RearCarburetor Diam:8.0mmCase Material:AluminumCarburetor:3 Needles