CT90 Restoration Adventures

Relocating the Drain on a Aftermarket Honda CT90 Carburetor  I recently picked up an aftermarket carb for one of my CT90's off of eBay that is very similar in design to a Klein 556A carburetor except for one detail and that was the orientation of the drain fitting.  The drain fitting pointed straight down verses straight back and is a common issue with aftermarket CT90 carbs. Related Posts: Adjusting and Jetting a Honda CT90 Carburetor  Here is a picture with the old carb on the left and the new carb on the right.

Honda CT90 and CT200 Gas Cap Teardown One of the most over looked elements of a Honda CT90 or CT200 fuel system is the gas cap used on the gas tank.  The gas cap plays a critical role and is designed to allow air to enter the tank and prevent a vacuum from forming as fuel is used by the engine as the CT90 uses a gravity feed fuel system.  While allowing the tank to vent air the gas cap also utilizes a labyrinth design to minimize the gas fumes that can escape from the tank.