There is always a tension devise on all stationary
motors throttle linkages. Some were friction plates with screw adjusted pressures, some with wingnuts and some with ratched notches or serated teeth assemblies. If needed, us a mirror to look in the harder to see areas and somewhere between the control handle and fuel control assemble (injector system on diesels or carb on gas)you will find the devise.For example, many lawn mowers use a simple screw controlled pressure plate mounted at the throttle lever assembly itself.This item on your boat could turn out to be something very valuable to know about. Usually at the worst time you could think of, it will require you to hold the throttle in position full time, while in a full blown gale, as you decide to run to the mooring area rather than tack for the next 10 clicks.When you locate the devise carefully adjust it while checking for freedom of movement fore and aft with just a little more resistance.Good hunting,RayS/V Speedy