Air Filters

[OldF7Guy_imp]

That is a proven setup ion a different type of carb than most Hondas use. The Constant Velocity carb needs a specific vacuum signal to operate properly and when the airbox is removed it drastically unbalances the carbs because different amounts or air reach each individual carb. The airbox balances out the incoming ait charge and allows the CV carb to function as designed. If you have a CV carb on a single cylinder engine, then removing the air box is a mute point, but when you have to have a balanced air charge the airbox become an almost absolute necessity to make sure everything is even and balanced.

Best explanation I have ever heard. Makes sense.