I checked and las two digits are 97, so its defenitly a 97, it has a cracked piston and crankshaft, but since its kinda old and I dont knoww what type of or if it had maintenance done before, I was thinking about a rebuilt engine just for replacing it a starting with something rather "new", and here comes another question, if the engine on it is a single carb, and I go for a rebuilt, is it of any benefit going dual carb?