Hey everyone, im new to the tractor world, i just love tractors b/c farming is something my forefathers have done for centures. Although i live in the city and have no grass i picked up a 1950's toro 500 for 150 bucks. It had a 5 hp briggs which was good but not super fast. i took off the mower deck, trying to get bigger tires (the last guy has some very small not even original height ones) and maybe make it taller and stronger. Firstly i picked up a vtwin 18 hp briggs. I hooked it all up (minus not figuring out where to buy wire to connect battery to starter, but it seems really slow similar to the 5 hp. what have i done wrong? its a 3 speed toro. also what kind of 12v battery should i be using or dos it not matter as long as its 12v? is a 18 hp briggs vtwin. Keep in mind i know nothing about tractors! thanks in advance.