Mikuni Carburetor ID Guide
PLEASE UNDERSTAND WE DO ONLY MIKUNI AUTOMOTIVE SIDEDRAFT CARBS
NO BIKES, PWC, SLEDS OR UTILITY/GARDEN EQUIPMENT
Mikuni Carburetor Identification for Sizing
This page is intended to help identify the type of Mikuni carb by either the top view of the Float Chamber Cover, the Float Chamber cover gasket and/or the Jet Chamber Cover gasket. PLEASE NOTE THAT MIKUNI WILL BE PRINTED SOMEWHERE ON THE CARB, IN SMALL OR LARGE LETTERS, EVEN THOUGH IT MAY OR MAY NOT SAY SOLEX. If the carb says only SOLEX, has a 3 bolt jet cover and says it is made in Italy or Germany or anywhere else in Europe, this is a pure European Solex and has NO interchangeable parts with Mikuni's except a fuel jet.
|Mikuni/Solex 40mm Type R||40mm Type R Float Chamber Gasket
||40mm Type R Jet Cover Gasket|
This is the standard 40mm PHH most common to North America. Referred to as Type R 40mm. Throttle Butterfly will have 165 stamped on the throttle plates. This unit has the external float adjuster & 10mm hex body needle/seat.
|Mikuni/Solex 40mm Type T
||40mm Type T Float Chamber Gasket|
This is the second style of 40PHH, Type T. This unit was OEM for Toyota, hence - Type T, and came on several models that used the 18RG and 2TC/3TC motors. Uses standard 40mm Type R kits and parts believe it or not. The Type T jet cover gasket and float adjuster gasket are NLA however. It just looks funky because the Float Chamber Cover is so different. Throttle Butterfly will have 165 stamped on the back of it.
|40/44mm PHH Type S4||40/44mm Type S4 Float Chamber Gasket||40/44 Type S4 Jet Cover Gasket|
This is the Type S4 version of the 40mm and 44mm carbs, also called the 4 bolt top cover. Both 40 and 44's were made in this style. Looking at the back of the butterfly will confirm size, 165 is a 40mm carb, 175 is a 44mm carb. Note that the kits will be the same for both 40 and 44mm carb. Simply specify Type S4 Carb. This style carb does NOT have external float adjustment and uses a 14mm hex needle/seat.
|40/44mm PHH Type S5||40/44mm Type S5 Float Chamber gasket||Type S5 Jet Cover Gasket|
This is the more well known Type S5 carb. Now, once again, these came in both 40mm and 44mm versions but are best known in North America as the 44mm carb. This is also referred to as the 5 bolt top cover style of carb. Looking at the back of the butterfly will confirm size, 165 is a 40mm carb, 175 is a 44mm carb. Note that the kits will be the same for both 40 and 44mm carb. Simply specify Type S5 Carb. The S5 also has the external float adjuster around the fuel inlet pipe and uses a 10mm hex needle/seat.
NOTE: MIKUNI NOW ONLY MAKES A UNIVERSAL STYLE FLOAT CHAMBER GASKET THAT FITS BOTH THE TYPE S4 AND TYPE S5 CARB. IF YOU LOOK CLOSELY, YOU CAN SEE ALL OF THE SAME ELEMENTS IN EACH FLOAT CHAMBER GASKET EXCEPT FOR THE 5TH HOLE IN THE FRONT. NOT TO WORRY, IT WORKS PERFECTLY AS THEY INTENDED IT TO, JUST SIMPLY SLICE OFF THE PART OF THE 5TH HOLE THAT HANGS OUT THE FRONT AFTER ASSEMBLY ON A 4 BOLT TOP CARB!!
|40/44/50 PHH2 Type Q||40/44/50 PHH2 Type Q Float Chamber Gasket||40/44/50 PHH2 Type Q Jet Cover Gasket|
This is the Ubiquitous Early Type Q carb. Orignally all Mikuni carbs were this style and actually came in not only 40mm, 44mm, but 36mm and the big boy 50mm race carb. All of these are fairly rare but the 36mm and 50mm are the rarest. These are also referred to as PHH2 carbs but for our purposes, we will call them Type Q. The 44 PHH2 was also the earliest original "Solex" option carb for the Datsun 2000 Roadster. This carb uses a 14mm hex needle/seat. Mikuni does not offer a rebuild kit for these carbs but WCR has their own kits available including the OEM gaskets shown. Just Ask!!