Trimming Your Throttle Function
* Adjust the pushrod so that the carburetor is fully open at full throttle and at a reliable idle
when the throttle is at neutral. You can adjust your throttle linkage with the pushrod
connector or, if necessary, cut the pushrod shorter. You may need to adjust this linkage when
you first start your engine.
Note: It may take some trial and error with both the pushrod and your radio trim and "EPA"
(End Point Adjustment) functions, but you need to end up with the throttle linkage set so that:
1. The engine idles reliably, but not too fast, when the transmitter trigger is at its neutral
position.
2. When you pull the trigger fully open for high speed, the servo movement should fully open
the carburetor barrel hole.
3. When you push the trigger fully closed, the engine must stop.
Note: For your first runs we recommend that you set the throttle barrel to open no more than
about 3/4 of the way rather than fully open even when your transmitter trigger is at its full
speed position. This will help you correctly runin your high performance XP254M engine.
After having set up the throttle linkage as described above, use the "EPA" function in your
transmitter to restrict the throttle from opening more than 3/4 of its full movement. After the
engine has been fully runin, you can reset the "EPA" for the throttle butterfly to fully open
for top speed.
Trimming Your Steering Function
Similarly, you need to adjust your steering linkage via the pushrod connector to obtain the
correct rudder operation. First make sure your steering servo is in its neutral position, then
adjust the length of the pushrod so that the rudder is centered. If necessary, cut the pushrod
shorter.
Note: We recommend using the "EPA" function on your radio to set the rudder so that it turns
about 2025 degrees either way for both left and right turning. This will give reliable and
stable turns at high speed.
* Thread the receiver antenna wire through the antenna mount and Close the box cover and
secure it with the nuts removed earlier. Installation completed!
Note:
If you use bigger size of battery pack or receiver which might not fit properly upon the
servo tray, you can modify the servo tray as picture shown above to fit your equipment in
properly.
