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Instructions Valach VM 120 B2-4T
10
It is a good idea to make a throttle linkage like the one showed above. The throttle
valve will move slower on idle than on full throttle. As a result the engine will accelerate
faster and more reliable from low idle. The use of a throttle curve in your transmitter
will NOT have the same effect, because it has no influence on the servo speed. For
example, if you move the throttle stick fast from idle to full throttle, the transmiter
will not follow the trottle curve, it will only transmit the command „full throttle“. The
throttle valve will open on the full servospeed. The servoarm should have a lenght of
about 14 mm to maintain the full servotrack.
To link the throttle valve drill a 2 mm hole into the existing arm and attach a ball joint.
Keep the throttle linkage as light as possible, a carbon rod is the best choice. By no
means remove the spring. The life-time of the throttle valve bearing of the carburet-
tor depends on this spring and a light linkage. In the appendix you can see several
pictures of my installation of the engine in my 3 meter EMW Pitts.
I actuate the choke with a servo too. This gives me the opportunity to shut off the
engine, without using an electronic switch.
Choke arm
Throttle arm
Fuel nipple
The intake RAM tube is
absolutely neccesary!
Without it, the engine will
run too lean.
Throttle valve completly closed
Full throttle
