The VIJA J-10Si is a French aircraft engine, designed and produced by VIJA Aircraft Engines of Toulouse for use in ultralight and homebuilt aircraft.
The company was founded in 2004 and went out of business in about 2015, ending production.
The engine is a four-cylinder four-stroke, in-line, displacement, 16 valve, air-cooled, fuel injected motorcycle conversion, petrol engine design, with a mechanical gearbox reduction drive with a reduction ratio of 2.55:1. It employs electronic ignition and produces at 6600 rpm, with a compression ratio of 10.5.