Thanks McBrat,
This Brat that I got was given to me by my inlaws. It has been sitting for about 5 years! You would not believe what would come out of a carb, fuel pump, gas tank and fuel line. Its unreal!! I went through the carb saturday and got it to bust off and half way run. (when going through this carb there is a little red ball that is a check valve on the acceleration pump. DONT LOSE IT. lol)
The reason i was asking if they were interchangeable is, when i first start it the motor sounds ok, as it starts to warm up and the oil get thinner it starts sounding like its a little wore out. Are all of the flat motors like this? Im gonna change the oil and see if oil that isnt 5 years old helps.