When is the best time to tune up a carburetor?
The average back-yard mechanic seems to have a carburetor fetish. When the engine isn’t running right, out comes the screwdriver to adjust the carburetors. When he does what he naively thinks is a tune-up, the first things he attacks are the carburetors. When he has nothing better to do, he fiddles with May/June the carburetors.
What is back to basics for carburettor tuning?
Back to Basics #11: Carburettor tuning BACK TO BASICS #11: CARBURETOR TUNING by F.E. OLD Technical Editor “Back to Basics”, for those of you who are fairly new to the Register and TSO, is a series of articles designed to help the would-be back-yard mechanic cope with basic automotive maintenance procedures.
Why are carburetors the last item to troubleshoot?
This is wrongl Most cases of poor running are caused by malfunctions in other areas ofthe engine, not by the carburetors. The carbs should be the last items checked in a troubleshooting sequence unless you are experienced enough to know that they are the only possible cause of the engine’s strange behavior.
How are the Jets on a carburetor tuned?
Carburetor main jets are tuned solely to achieve one thing: the best performance at fully open throttle. Jets should never be changed to correct an idle impediment. Instead the idle circuit should be adjusted and the initial ignition timing re-checked.
Which is the first rule of Carburetor tuning?
The cardinal rule of carburetor tuning is Ignition First. Once the static ignition setting and the ignition advancing mechanism in the distributor is correct, the air-fuel mixture can be tuned for full power and fuel efficiency.
How does a carburetor tune the vacuum advance?
Tuning the vacuum advance mechanism is achieved by use of an adjustable vacuum advance or changing the location where it senses the vacuum in the intake manifold. Tuning the mechanical advance mechanism is accomplished by replacing the springs or weights or both.
What do I need to tune my carburetor?
To do a topnotch job you’ll also need a PSW tool kit for the S.U. carburetor, which is sold as an “S.U. Tool Kit” by most of the T Series parts suppliers and may also be found at many foreign car parts stores. You might also want to obtain a Uni-Syn or similar synchronizing tool.
This is wrongl Most cases of poor running are caused by malfunctions in other areas ofthe engine, not by the carburetors. The carbs should be the last items checked in a troubleshooting sequence unless you are experienced enough to know that they are the only possible cause of the engine’s strange behavior.