I have a Merc Thunderbolt 100 HP. It appears to have factory throttle control. It has the push-button choke control and the standard forward reverse control. I'm not sure what the smaller lever is to the right of the forward reverse lever and how to use it. My guess is that its some type of cold start lever but not sure. I do know that I struggle with starting the motor after it sets for a few minutes. Thanks for your comments.