I was given a string trimmer with a Power Products engine. I have not seen this brand,since go cart days in the 60's. It is so old that the fuel tank has a caution sticker that says"do not use un-leaded gas". It starts very easy and seems to have a lot of power. Serial# plate has model 99. I don't know if this is for the total machine or the engine. Does anyone know about this engine and would it be a converter. Also it looks like it could be 25-30cc. thanks for you input in advance

gary