I decided to go for a new carby on mine, and  have used a single choke weber on my 2 1/4, used a couple of good fuel filters and found it to be a very good choice for response and mpg(lol) with no problems in 5 years. I quote the info i used from here
 :-
 
Weber 34ICH on a Land Rover engine
I used a 341CH single choke  carby. Be careful because out of the box jetting is                     usually too lean and a burnt piston can result. See the note                     below for jetting. Sensitive to alttude changes. Main jet                     at bottom of fuel bowl so requires very clean fuel.
The Weber 34ICH is a generic               carburetor designed to be adaptable to several different brands               of small engines. This means that the jetting is complicated enough               to require an expert to get it tuned as close as possible to your               engine's needs. However a 165 Main Jet , 190 Air Correction Jet               and F6 Emulsion Tube will normally get a stock Land Rover 2.25L               engine running acceptably well at or near sea level. At around               7000 feet try a 155 main jet. Webers tend to be sensitive to altitude               changes and need to be leaned out at around 5000 feet for proper               running. Because this Weber is designed for generic small engines               it often times comes with jetting that is too lean and will burn               pistons or valves.  Be               sure to check the jet sizes before installing.              While the 341CH has more top end power than the Zenith it is a               lot more susceptible to dirt and water in the fuel and can frequently               cause problems if the fuel is not clean and well filtered. The               Weber's main jet is located at the bottom of the float bowl, where               it can be clogged with gunk. The Zenith and Rochester have their               main jets supported from above, and are less susceptible to clogging               and moisture.
             The Weber 34ICH is a direct replacement for the Zenith carburetor               on your Land Rover 2.25L engine.  If your Land Rover came               equipped with a Solex you will need to buy the Zenith adaptor that               rotates the carburetor 90 degrees. 
             I  recommend the 
Rochester               B over the Weber 34ICH. The top end performance of the 34ICH is               less than the Rochester,   The 34ICH is harder to jet and more often a source               of running problems. However it can be an efficient good performing               carburetor if properly jetted for your driving conditions and your               fuel is kept very clean and free of moisture.
               
I took my info directly from the expedition landrover website
http://www.expeditionlandrover.info/landRoverFAQI am verily happy wth my results
cheers
V8Johnno ( also owns a 2 1/4)
Bookmarks