Thanks step. If i didnt get me a 21mm Dello on ebay already i would be on that. I like the quality of the dello over the stock VM 18 Mikuni i had. The dello is so compact next to the mikuni, buy yet its big in the important areas . Cant wait to try it out.
You will definitely need a new intake or adapter to fit a 28mm. I wouldn't put a 28mm on a 70cc sport kit, but that's just me. There are certainly plenty of people that have done it. I'd stick to something smaller to keep the throttle response more crisp.