Last week I visited the factory for four hours. I noticed that the throttle quadrant plates have two 3mm hex bolts installed. I guessed these are the forward and aft throttle stops. When I got home I had a closer look at the build manual and there it is, Throttle quadrant, page seven" The throttle stop bolt fitment". My plates do not have as many holes drilled as the later plates do, so I had to drill one extra forward hole to allow the throttle full forward movement before it hits the stop.
Photo 1. Full throttle, extra hole drilled. 2. Idle power, many holes to choose from. 3. Mid throttle, you can see forward and aft stops.