I just got a Matt Chapman .46 CAP and I've installed all the servos except for the throttle servo. I got a JR sport standard ST47 I think. I cant get it to move the throttle all the way open even with full throw. I NEED HELP!

First thing to do is make sure your throttle trim on your tx is in center position. How is your Throttle rod attached to your servo? If it is with a t-clevis then loosen the t-clevis open your throttle to full open on tx and manually open carb to full open. You should then tighten the t-clevis with the carb full open. Try this and see it it works for you. I have a chapman same size with a 91 magnum and that was the way I got it to work with a little trimming on throttle. I had to use a throttle cable instead of a solid rod but the principal is the same. J D

you may also need a longer servo arm for more throw.

i second that