You'd be suprised as to how well those big baloon tires work in almost every terrain, I would buy another set of stock tires. As for the plug, use the one that comes out of it, and cleaning the carb and tank is a must. Also, be sure to change the oil BEFORE you get it running. You may have to sand down, or replace those points (if they even have points) to get it running too. You should check your spark to see if it needs ignition work before you go sanding down points, or replacing coils (whichever it has). Good luck.
1986 ATC 250R(for sale), 1963 AceCraft boat w/40HP Evinrude, 1981 Arctic Cat El Tigre' 440 L/C, 1992 GMC Safari Van.