3W 42i Engine Manual
more infos: www.3w-modellmotoren.de
Carburetor settings
Before each engine is shipped it has to pass QC and is then test run. We do a basic adjustment
of the carburetor needles at that point.
highspeed needle H:
1 1/4
low speed needle L:
1 1/2
Important:
Do not remove the carburetor spring as the spring helps keep the carburetor butterfly
aligned properly. Merely release the ends of the spring so that it no longer holds the butterfly
closed.
Carburetor Linkage
Included with your engine is a metal bracket to extent your carburetor pushrod horn. Fix this
bracket onto the carburetor horn with a 2.6m machine screw and nut. Then solder the arm in place.
Refer to the attached illustration.
Note: The use of a soft pushrod for the throttle (plastic or nyrod) is not recommended. Use a metal
or carbon fiber pushrod with a plastic ball joint or plastic clevis at each end. This will keep your
RPM much more consistent and accurate around idle where it really counts.
