up your carbs
A general rule about setting up carbs is to expect your fuel consumption to rise proportional to newly-found horsepower. When setting up your carb, the bestapproach is to set it up on the rich side, then lean it back until you get quick throttle response. Tuning too lean is dangerous, because if can burn out your engine.
should not be a problem on your Harleys carb. If idle isnt smooth and steady,
look for a vacuum leak in the intake manifold/cylinder head seal area. An old
mechanics trick to check for such a leak is to use a spray can of carb cleaner
and a straw. With the engine idling, direct the spray strongly around each
clamp. If the engine RPM changes suddenly, youve found the problem. Vacuum
leaks at manifold joints are common and should be checked for frequently.
common problem is spitting back through the carburetor. This indicates that
the mixture is too lean.
smoke out the exhaust indicates a too-rich mixture.
can get an idea of your carbs mid-range mixture quality by checking spark plug
how to do a reliable spark plug test: Grab some heavy gloves, an extra pair of
plugs and a plug wrench, and head out to a flat, empty stretch of highway.
Maintain 60 70 mph for at least five
miles. Shut off the engine at cruising speed and pull in somewhere safe. Before
the engine cools, pull your plugs and have a close look at them in good light.
the round, flat surface perpendicular to the threads. This area should be
mid-brown/gray. Black indicates youre running too rich in the mid range, white
means too lean.
into consideration your altitude (higher means a richer-running engine),
barometric pressure, air temperature and the conditions under which you
normally ride. Its best to tune in the same conditions, and preferably on a
warm, clear day when the barometer is high.
other carb adjusting tips
consumption can have an effect on your plug color.
main jet is easy to adjust, but requires more speed. You can get a feel for the
main jet in lower gears, but the ultimate test is flat out.
again, plug color is the final indication of mixture.
are quicker ways to get you to the ballpark. When your motor is revving over
4000, is it heavy-feeling, sluggish, and unwilling to pull strongly? This
probably means the mixture is too rich.
up to redline, then back off the throttle slightly. If the motor wants to run
faster with the throttle backed off, the mixture is probably too lean.
always, check your plug color its the most reliable indicator of carb tune.
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