ok is there any way to get my throttle set exatcly to the point as what the radio says..... when i set my throttles up i do it buy setting the carb to half way and then letting the servo center and then connecting them at a 90 degree angle

I actually prefer to set them where closed has the servo near the end of its useful travel. That makes the movement coarser at open and finer at closed. With actual travel, it's just a matter of getting the right servo arm hole and adjusting travel on the radio.

CG retired posted this, really excellant info

http://www.rcuniverse.com/forum/m_83...tm.htm#8375449

It makes it easyer if you make sure the peramiters on your radio are at the centered point .Spectrum transmitters have a beeping sound with each click or movement of the switch going up and down the scale with a solid note to let you know peramiter is centered on transformer then place servo arm 90% off then screw in or out clamp for settings just remember you need to be able to shut down engine with peramiter switch after flight. its alittle tricky but you"ll get there.

I always try to set my throttles such that the fully closed position on the carb barrel (engine cut off) is at the farthest point of travel on the servo arm (100 percent throw) and the servo arm is either pointed directy at or directly away from the carb (depending on your throttle movement). Setting it this way causes the throttle barrel to move less for a given amount of servo travel at the low end. This helps account for the increased sensitivity of the engine RPM to throttle movement at the low end, resulting in a more linear throttle response. I then adjust the geometry to provide maximum servo travel to get to to the fully open position by selecting which holes the connecting rod or cable is attached to. Finally I use the end point adjustments on the radio to fine tune the low and high throttle settings to prevent jamming the barrel or adding undue stress to the servo by pushing or pulling against the stops.

By starting from the mid point, you're setting yourself up for having most of your throttle response before you get to the halfway point on the transmitter. I hate to count the number of pilots I see that think they're flying at half throttle, but are actually at 75-80 percent already.

Brad

Because i have a digital radio with a throttle cut i put the throttle channel full open including trims and the oppen the throttle on the carb. Then i just cut and bend the wire to its proper length