You don't need anything special to run a webber on the 1.3...Is it new or used. Check for vacume leaks at the base plate. Webbers will still idle when they are about to fall off from loose hold down nuts, untill you try to give it gas. Make sure your air mix screw is 1 1/4 turns out. Use Loc Tite on the baseplate studs or they will work loose...then you will have to pull the carb to retighten them. Pain in the Ace. Just my two cents...Gary