I plan on removing my servo return spring in favor for a engine return spring, what if any are you guys using for the engine? I've found a few, however, they seem geared towards big block engines.

Rubber band

balloon

I was trying to use a real spring, not a rubber band, guys..

+1

The best thing is the neck of a party balloon. I've used the Zeppin return springs but found these not really strong enough. The party balloon neck doesn't seem to be greatly affected by fuel etc whereas a rubber band seems to perish quickly and break. I've been using balloon necks for probably 20 years with perfect results.

Most people use hair bands.

https://www.amainhobbies.com/gmk-sup...-gmk0104/p7029

Ok, I'll pick some bands up. If I get a run-a-way, I'm sending you guys the bill..haha. I'd much rather have a metal spring on there. Do you guys have any pics of these set-ups?

Metal springs often bind up the carb and can cause a run away. They also eat away at the carb boot. Use bands.

Thanks. I'll go grab some and give it a second thought.

I like 2 rubber bands, when the first one croaks from use then replace both.

with the KO servo I don't see a need for a really stout return spring but something like Xpert might need a more powerful return spring.

I use 1 rubber band AND a throttle return spring on the linkage. Same function, different implementation. Chance of both failing at the same time is close to zero