I have an OS max .35 Is there any place i can get parts for it. and also, someone recently gave me a fox engine and i cannot determine the size, I think it is in between a .40 and a .60. it is not on the engine and i really dont know that much about it to figure it out by myslelf. all i know is that it i around 20 to 30 yrs old and fox does not mae it anymore. i would like to know how to get the muffler to be able to pressurize my fuels tank because it hs no fitting for a tube on it Please email me thanx

Search for the "Model Engine Collectors Association" They will have info on getting parts for the old engine and they will be able to aid in identifying the old Fox.

Some hobby shop that has been in business for 20 years or more may have the parts you need. I know the shop in Waco, TX has a bunch of "NOS" (new, old stock) O.S. parts... not sure if they'd have what you need though.