I see thanks. I somewhat suspected that so I messed with it while idling on muffs. It may no longer be functioning as I turned it all the way both directions and experienced no change whatsoever.
You will find that it only limits how far you can reduce the speed.setting of the twist grip.
If you turn it counterclockwise you will be able to reduce the speed by turning the throttle grip to a lower setting.
Turning it clockwise will limit how low you can set the throttle control., In other words increase the idle speed.
As flying Scott says you can use it to fine tune the idle speed for trolling but with the clamp #7 you should be able to adjust the throttle friction so that it stays where you set it.
I dont think I would have figured it out without reading it in the owners manual
LeeRoy's Ramblings cover just about every ting you will ever need to know about the 15hp engines
http://leeroysramblings.com/Outboard...0articles.html