This Mikuni TM40-6, RS34, 36, 38 and 40 air-box adapter is designed for use on motorcycles requiring an increase in outside diameter to 58.5mm when wanting to use the standard OEM air-box. The adapter is made from silver anodized aluminium.
This air filter, air cleaner, air box adapter sleeve has been designed and manufactured for a good interference fit over the Mikuni carburetor spigot.
The sleeve has a 55mm ID at the carburetor spigot with a 58.5 OD
This spigot must be installed by a competent person. It is recommended to carefully remove with a fine file any protruding castings found on some carburetor spigots before carefully tapping on the new sleeve with a nylon hammer. When fitting the sleeve we recommend the use of a high strength 620 Loctite retaining compound. The adhesive besides helping bond both items together will fill and seal any imperfections found on some carburetor spigots and also acts a a slight lubricant for the fitment.