4) Set the idle rpm by using the idle air screw, and try to find a
low but reliable idle rpm. A too high idle rpm makes it more difficult to slow
the car during breaking.
Attention: When adjusting the idle needle, this then can effect the idle
rpm, use the idle air screw to adjust the low rpm when it becomes too high
or too low.
Once you are satisfied with your carburetor settings you are ready to put
the car on the track and make the final adjustments.
· Final adjustments while driving.
When ready with the pre adjustments you are now ready to put the car on
the track and start your final adjustments. If you have set your idle needle
and idle rpm correctly in the pre adjustment phase then you only need to
adjust the main needle to find the correct setting and performances of
your engine.
Start leaning the main needle by small increments (1/8 of a turn maximum)
and run the car again, repeating this sequence until the engine completely
cleans out, accelerates well and reaches maximum speed. To prevent
your engine from running too hot, it is advised then to richen the main
needle (1/8 of a turn counter-clockwise), since running the engine too
lean on the main needle will cause the engine to overheat, resulting in
excessive engine wear and possible breakage.
A possible way to check the engine temperature is to apply a few drops of
water on the cylinder head. The drops should evaporate only after 3-5
seconds, If they evaporate immediately the engine is too hot, so richen
the main needle (1/4 of a turn counter-clockwise) immediately. Check your
engine temperature regularly.
Another way of knowing if your engine is running too lean, is when you are
driving and the engine starts too loose its power at the low rpm range and
no smoke is coming from the exhaust; if this happens, richen the main-
needle if you do not want to damage the engine.
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