Check it out. The problem here was a throttle pushrod exit point intended for an inverted four stroke. It was several inches off-center for the side-mount two stroke. And due to the fuel tank location, moving the throttle push-rod "run" was not an option. But the principal is the same; you off-set the linkage input to reverse the "vertical play" caused by rotary movement; now, the linkage is "out in the open" (as opposed to coming through the firewall directly onto the throttle arm) and has room to do its thing.

This lash-up was fabricated from a DuBro heavy-duty servo horn, and some left-over small bearings, etc. from my helicopter stash. The bearings weren't really necessary; a proper-fitting bushing will do just as well.

Yeah, it took some time and tweaking to get right. But that's why they call it "modelling", eh?