Model Forum / Radio Controlled / Air Models / July 2004

Sometimes it pays to follow the instructions.  What had been thought by some as
being a typo in the instructions, myself included,  i.e. the high speed needle
with 0-1/4 rotation,  turned out to be right on the money.  After doing a
search on RC Universe I found the following gem of a post:

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The old G38 carb (WTA6) is designed to be run with the high speed needle
adjusted from closed to 1/4 turn open...There's a small brass plug over the
high speed needle with a small hole in the center..With the needle closed there
is still enough fuel going through the hole...

So most of the experts were wrong for this carburetor and they were giving out
information for the newer carburetor for the G-38 that does not have the brass
plug.

Here are the results I obtained using a 3W 18-8 prop with low speed needle set
at 1-1/4 turns open  2000 rpm,  high speed needle set at 1/4 turn open 7800
rpm.  The engine started right away after choking and going to 1/4 throttle.
The transition was excellent after a slight warm-up and  the idle was good and
top end perfect.  I emptied a tank transitioning from high to low several
times. After cool-down I started the engine several times using the pre-sets
and the engine started easily.  The winds were blowing ~ 30 mph today so I will
try her in the air tomorrow.

Joe L.