Originally Posted by stanleyw808

Hello skrichter,

The O.S Carburetor in each engine model are as follow,

XZ-B Spec II - Type 21J(B)
XZ-B Spec III - Type 21J3(B) R6.5
B2101 - Type 21J(B) R6.0
B2102 - Type 22C(B) R6.0
Adam Drake - Type 21J3(B)

XZ-B Spec II and B2101 have the same Carbutetor, the only difference is the Venturi type. The B2101 has the newer type Venturi.

XZ-B Spec III and Adam Drake have the same Carburetor, the only difference is also the Venturi.

The above four Carburetors are actually the same, the only difference is the Thermal insulator design. The 21J3 Body has the newer Black Insulator without the additional lower thin ring.

B2102 Carburetor is the different between the rest.

Hope this is clear enough..

Cheers..