Sanglas did indeed use their own engines. It's a short stroke (90x79) pushrod unit, with a duplex chain drive to the gearbox, which comes in 4 or 5 speed varieties. I know this, as i have one and they're good fun to ride - not quick, but the handling's OK. parts are get-able in the UK, as long as you use the net and work in spanish.... pix to follow!