my mistake it is an alpina i have searched the web and can find alpina saws but no information on them, what started me thinking it was a 4 stroke is that it has a chamber for oil which i thought was to oil the chain but when i pressed the button on the top of the handle which i presumed was the pump the engine stopped i tried it 3 times each time it stalled the engine, i asked one of the locals who can speak a bit of english and he said it was there to put extra oil in the carb, i do know a bit about engines but have never met this before.   cheers for the replies