Went on my last ride this year with my 99 Mach Z. Great trip. put on over 200 miles on it sat. But riding it with other friends made me realize some things. I was the only Doo guy out there there was my buddy with his ZRT 800, a ZR 600, and two F-7's. Guys as much as i like trashing T-Cat out of fun, those F-7's impressed the hell out of me. The performance and gas milage was awesome. They were riding HARD too and them things took so little gas. The one thing i realized was that something must of been up with my RAVE valves cause we got on a lake and EVERYONE smoked me. I had the throttle to the lever and i could only go about 70mph. Then with it to the handle after about 10-20 seconds a boost of power would hit my sled. I don't know if it was the valves getting unstuck or what. But i've been having so many problems with that thing and i'm rarely on a lake. What would you guys suggest to buy to ride fast and aggresive, good turning, LIGHT (god knows the mach isn't), good suspension, and gets good gas milage. Oh and will keep up them blasted F-7's. Sorry guys, but because of my gas, and problems with the sled, the day went to the AC guys ten fold.
P.S. the F-7 guys were awesome riders but there is no reason for EVERYONE to smoke a mach out of that bunch. Thanks for the tips everyone.

Look in to 'doos sdi motors, either on the rev, or the new RT platform (machz)...

sounds like this is what your looking for...