If you look on the plate that lifts up that covers the belt on the clutch side there is a list of what size jets you should be running at different elevations and with different temperatures. Its that way on my '94 and I would assume its the same on yours. You probably will have to replace that boot which could require a bit of work if the carbs were not taken off and cleaned regularly as the carbs like to freeze up in the boots and not come off. Also my carb has that same hose coming out of it on the bottoms, I believe it is a drain hose of some type. Maybe someone with more knowledge will be able to come on here and clarify it for the both of us.