Since the beginning of the 60's the Mikuni carb is still the best carb to run on most 2-stroke engines. However they are too large and bulky to fit on most chainsaws and would also require a fuel pump. But you can get a good idea of how big a carb you need on a particular size chainsaw motor by looking at what size of carb manufacturers use on their high performance engines such as go-karts and MX models and similar size motors. Of course Mikunis are float type carbs and cannot be run in any position. If you have a large Hot saw and it doesn't have to look stock and you can physically fit one on I would definitely use one.