Setting
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.
Idle adjustment
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.
Another
common problem is spitting back through the carburetor. This indicates that
the mixture is too lean.
Black
smoke out the exhaust indicates a too-rich mixture.
Checking
your plugs
You
can get an idea of your carbs mid-range mixture quality by checking spark plug
color.
Heres
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.
Observe
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.
Take
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.
Some
other carb adjusting tips
Oil
consumption can have an effect on your plug color.
The
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.
And
again, plug color is the final indication of mixture.
There
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.
Rev
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.
As
always
, check your plug color its the most reliable indicator of carb tune.
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