Booyah6973

I'm new to gas engines and I've been told by members in my hobby club to remove the idle screw and the coiled spring that wraps around the throttle body so I don't burn my throttle servo. Is this correct?
Any feedback would be apprecaited

flyinwalenda

My Feedback: (5)

There is no need for the idle-stop screw. Some new engine carbs have them,some don't.
The return spring issue is something you will get many answers to. If you leave it on you will always have a positive return to idle or closed throttle in case your servo or linkage fails. I don't see it causing a good servo to fail. I have some engines with and some without the spring.

dasintex

My Feedback: (10)

Totally Agree +++++

Truckracer

My Feedback: (19)

There have been several tests performed where it was shown the servo power and current required to pull against the throttle spring was barely above the idle current of the servo. In other words, the torque required from the servo to pull against the spring is extremely small. You can disconnect the spring if you wish but this is one of those cases where there are numerous reasons to keep the spring in place and few reasons to remove it.

Regarding the idle stop screw, remove it as in most cases it just gets in the way and serves no purpose on a rc gas engine. Many companies remove this screw as standard practice before shipping new engines.

TJC333

If you disconnect the spring don't remove it. It will cause alignment problems.

kmeyers

This guy is referring to the butterfly return spring.

ahicks

My Feedback: (2)

Leave the return spring connected, or disconnect (much debate/your call), but which ever way you go, leave it in place! Do not remove the spring.

Much debate over the connected vs.disconnected call, but everyone agrees that you should leave the spring in place.

dubs1946

Leave it connected it stops the possibility of vibration it gives a positive push against the connector.
Dave.

Booyah6973

Thanks a lot for everyone's reply. I will take the idle screw out and disconnect the spring but will leave it there. Thanks again for the supportive feedback !
happy landings ✌

dirtybird

My Feedback: (5)

I think you are making a mistake. If you leave the spring in place you can just pull the throttle open and let the spring close it. That way you can use just a small cable as you don't have to push it closed.

CARS II

My Feedback: (7)

I say a throttle kill switch covers the need for a return spring but leave in place. I have five different ways how to kill the engine on my gas airplanes.

dirtybird

My Feedback: (5)

Closing the throttle on linkage failure is not the reason I leave the spring in place. With the spring in place and using a cable to pull it open results in a more precise throttle control. There is no slop in the linkage

captinjohn

I agree 100% and with less slop it helps keep the throttle plate edge wearing out the throttle bore.

Capt,n

CARS II

My Feedback: (7)

Well, count me in, I may give that a try in the near future I'm open to new ideas ( at least new to me )

Flyfast1

My Feedback: (1)

This is an interesting idea. Do you think it would be just as effective to leave the spring in place and use a pushrod with ball links on the ends instead of a cable? Wouldn't the spring eliminate any
slop in the linkage of a pushrod-based linkage just as well as using a cable?

-Ed B.

Booyah6973

For my throttle setup I'm using a 4-40 rod with 4-40 hd ball links on both ends. I also have a #4 washer atop the ball link under the head of the screw to make sure the link doesn't pop off lol. The alignment to the throttle arm is ok. I took the spring off completely as well as the idle screw and seems to be fine. Will test this weekend at the field to be sure. Thanks again for all the advice and thoughts

Truckracer

My Feedback: (19)

With the spring removed from the throttle shaft, we'll be looking forward to your posts in about a year wondering why the engine won't idle well any more ..... as the throttle plate wears away at the throttle bore near the shaft. That spring serves a purpose whether it is connected or not. Removal isn't good. Best of luck to you.

Propworn

My Feedback: (3)

I like to leave the idle screw in place I just back it off so it has no effect in the model and when I want to use it on the test stand i can wind it in to adjust/set the idle. I can always use it to hold the engine at a set rpm on the test stand.

Dennis