It's an A35 motor. Looks like late 90's, early 2000's model. The carb is a Dellorto SHA 14:12 with stock airbox. I think the stock jet is a 53. I can't believe he ran it with a muffler! Bad for the engine, bad for the ears! Pipe is up to you; a lot of Tomos owners swear by the bi-turbo. I run the Jamarcol; it's a lot less pricey than the others and runs and sounds good. If it still has the oil injection system, tear it out and run pre-mix, especially if you're going to kit it. 40:1 should work well. That's a nice looking Tomos!