I definetly dont miss the days of carburetors! I guess a lot of quads still use carburetors but most of the new 450's have all been switched to fuel injection.

On my old Yamaha YFZ when we built a motor for it with ported head and changed exhaust and everything else, you had to spend hours getting the jetting right. Running the quad, checking for popping or sputtering, analyzing the color of the exhaust tip trying to tell if it is lean or rich. Removing the gas tank and plastic a million times to be able to get to the carburetor. Then carrying around a huge pack of different jets, needles and clips so when you travel to a race 14 hours away you aren't left stranded with a poorly running quad.

I just had a GYT-R Head, Piston, and Cams added to my '09 YFZ450R, but instead of doing these hours of jetting, all I had to do was call Dynojet, the maker of the PCV Powercommander, ask them for a map for my quad, and 5 minutes later I had a map emailed to me to make all of my modifications run right. Now, all I have to do is plug my laptop into my Power Commander, upload the map to the little Power Commander box under the seat on my quad, and Im ready to roll!