Kawasaki KX65 - Owner's Manual - page 114
113
j
With pinging or ratting, make sure that the gasoline
is fresh and the octane rattling sufficient. You might
also try a different brand of high-octane gasoline.
Making Adjustments
Carburetor tuning is made by replacing or adjust-
ing the main jet, jet needle and pilot jet, which regu-
late the fuel flow, and the air screw, which regulates
the air flow.
The following chart shows the working range of
each component. Note how the working ranges
overlap as the throttle valve opens.
If you note a particular symptom of too rich or lean
mixture in a specific operating range, use the chart to
determine which components need adjusting. Use
the following information to decide what changes to
make.
Main Jet
The main jet has its greatest effect in the 1/2-to-full
-throttle range. The number stamped on the bottom
or side of the main jet indicates the size of the hole
in the jet which meters fuel. The larger the main
jet number, the bigger the hole and the more fuel
will flow; hence, larger numbers mean richer jetting;
smaller numbers mean leaner jetting. Make main jet
changes one size at a time.