Toyota 20R Basic Carburetor Tuning Procedure & Info

This is the long-promised video on the Toyota 20R basic carburetor tuning procedure & info about it. This includes the "by the book" procedure as stated in the Owner's Workshop Manual (Haynes Manual #304), as well as a 'by ear" method of tuning the carb without the use of a tachometer (also see link below).
PLEASE NOTE: Before trying to tune the carburetor, several items MUST be in good order first, otherwise attempting to tune the carb could be useless. Some of these things are:
1. All typical Carb parts & mechanisms must be functional (choke, throttle linkage(s), etc.) & all should be in good working order.
2. There should be NO vacuum leaks. All vacuum hoses intact, any unused vacuum ports plugged with quality vacuum caps, carburetor properly mounted to the intake manifold; mounting bolt/nut torque spec 25 lb/ft or 35 Nm.
You can easily test for vacuum leaks with a can of carb cleaner with the engine running. There are plenty of videos on CZcams showing how to do this.
Look out for vacuum leaks from worn carb parts such as the throttle shaft bushings. Trying to tune a worn-out carb is futile. If you need a replacement carb check the link below (not sponsored).
3. Fuel Pump in good working order. No fuel leaks in any fuel lines.
4. Engine timing should be correct. Static timing spec for the 20R is 8° (degrees) BTDC (before top dead center on compression stroke).
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Replacement Carburetors: nationalcarbur...
I am NOT sponsored by this company & I do not receive any money for referrals. I personally recommend them because they do very good work & offer a good product at a good value price IMO.
Basic Lean Best Idle Adjustment Instructions by WEBER: www.redlinewebe...
These are basic instructions that will work on almost any carburetor regardless of make or brand. No tachometer required but be advised - setting the low idle speed much faster than what is recommended for a particular engine can cause you running issues. For the 20R & 22R I don't advise setting curb idle speed past 850 RPM. 800 is usually good enough, for either manual or auto trans models.