The Datsun 240Z’s SU Carburetors featured a simple design that delivered fantastic performance when operating well. Great gas mileage and perfect response could be expected out of these carburetors when tuned well. Unfortunately, many of these carburetors fell into states of disrepair rather quickly, especially after sitting for a while which is extremely common today with these 240Zs approaching 50 years old. This situation is made worse by the fact that fuel available in recent decades does not match up to the standard of the 70s, and carburetors became clogged and in need of rebuild very quickly. All of this combined with the fact that most 240Zs today have been worked on by countless mechanics (and at-home mechanics!) makes rebuilding, cleaning, and tuning your 240Zs carburetors rather difficult.
There is a lot of information available on the subject, but it is often disorganized and not specific to the 240Z. ZCarGuide has compiled a complete guide that will help you understand, remove, rebuild, clean, and adjust your carburetors so they operate perfectly again. This guide is split up into several different sections, and for each section there is both a text and video guide available, so you can choose whichever medium you prefer.
Understanding SU Carburetors
Removing your SU Carburetors
Rebuilding and Cleaning your SU Carburetors
Tuning and Adjusting 240Z SU Carburetors
Video guide coming soon.