I'm Tyler, 20 yrs old and just acquired 2 free mowers! 1984 MTD, and a 1986 Montgomery Ward Indutrial. I plan on making the 84 a racer to play around with and using the 86 for parts. They both have 12hp b&s motors. What tips do you have on making this mower fast? Pulley sizes? Right now i'm looking for tires. The factory ones are 15-6-6 on the front. I'd like go down a size or two and have them on all four sides. Anyways, I'll be posting lots of pictures and asking alot of questions so please help me out! Thanks!