i was given an OS MAX airplane engine but have no knowledge of airplanes at all, but i have nitro rc monstertrucks and the OS MAX is in pretty good condition and is oiled it has a carbourator and some minor scratches im not sure what size the motor is but i have a .28 nitro truck engine in my truck and the airplane engine is only a little smaller looking, i have no idea how to price this item for sale so any info would be awesome thanks alot

respectfully, Mike

car motors have a heat sink and airplane motors dont the size should be marked on the side of the case post a photo and a ID will be soon to follow I am sure

all it says on it is OS MAX and 2BK

2BK is a carb number. According to OS it originally came on one of the following engines: CZ-R, CZ-11, CZ-1, CZ-2. A picture might help people identify it.