Sorry, I should clarify that the inlet valve or needle and seat assembly come in a range of different sizes depending on the application.these sizes range from 1.5 to 3.5. Check a parts break down of a mikuni tm carb and it will list the different size needle and seat assembies available. Definately a good thing to check for if you are putting a set of sled carbs on a banshee. Also sled carbs have a richer starter/choke circuit than a carb calibrated for a bike, so you may have easier cold weather starts.