Originally Posted by
speedracerntrixie
on gas engines I always extend the throttle arm so that I have a 2:1 ratio between throttle arm and servo arm. This allows you to use full servo travel and then adjust so that the carb opens up to 85% at full stick. That last 15% gives no additional power with these engines. The end results is a much more linear throttle curve and you can lean the high speed needle down just a touch more which will help eliminate the mid range burble common with gas engines.
On gas engines, I always use Amsoil at 50:1. Well, not always, I have found Redline to be good quality as well. I have a friend that uses Pennzoil with good results and others that use whatever is cheapest at the auto parts store, YMMV.
Astro