I have the Airtronics VG400 it has end point adjustments for the throttle, is this the correct setup. At high throttle with the trim in the center I adjust the high point end adjustment so there is a very slight bend in the push rod to be sure it is open all the way. For low end I set the trim to minimum and adjust the low end point so there is a slight bend in the push rod at fully closed, then moving the trim to half should give my idle setting. The bend in the pushrods is very slight I am doing this to be sure they are at the max in each direction the servos don’t buzz with this setup.

No, the pushrod should NEVER bend. You are better off not opening fully that stressing a servo.

Minn is absolutely correct. When the pushrods are bending as you described your are putting the servo into a position where it's stalled, and when it's like this it can draw HUGE amounts of power from the battery. So much so that it can drain your battery very quickly and you risk losing control because of radio failure.

Ken

will readjust it today, thank's
Bill

I don't understand how you are bending the pushrod while "pulling" it? Also, on many radios the trim has no effect at the FULL throttle position so setting to middle would be meaningless. You appear to have other issues.

The radio has two small pots marked “end point adjustment throttle” one marked high and one low, each one moves the servo a several degrees. With the throttle at max the high adj. and the trim moves the servo. The push rod bends in both directions because the rod is not straight but has a bend in it. Were do I set the trim during the high and low adjustment?

The trim should not affect the high end - That is, when the throttle stick is wide open, the trim should have no effect.

On the low end, the trim should should be set so that when it is all the way down the barrel should be completely closed and when it's all the way up, you should see a fairly good size opening (As idles go).

On some transmitters, the trim does effect the high end as well as the low end. To be safe, set the trim to max then set the high end point so it just moves the throttle to the stop (no bend in push/pull rod). Then set trim to min and set the low end of the EPA so that the throttle barrel just barely completely closes.

I always set the throttle from the idle postion on the TX. I want the carbarator to be open about 1/32 to 1/16th of an inch at medium trim, low throttle. Make sure the throttle idle set screw is backed out, so the barrel on the carb. can move to a completly closed position, but not so far out that the barrel can come out of the carb. Then I check the full throttle position. You do not want to have the servo travel exceed the throttle travel on the barrel of the carb and stall the servo. If you have to much travel, either adjust the end point adjustment; or, change to an inner hole on the servo arm. Making these adjustments, will likely mean starting from square one with the idle again.

Readjusted as recommended but now to get full throttle I need to move the throttle trim all the way up with the throttle is this the way it should be?

If you have mechanical trims, then yes the trim should be all the way up at full throttle. The trim and the stick should be all the way down to kill the engine, and the trim all the way up, and stick down to start/idle the engine.

Try this: Start the engine. Trim the low end. Go to full throttle, let it reach it's max RPM and then move the trim lever to full and see if it makes any difference.

I'm betting it either won't, or it will be so slight that it won't matter.