This adjustment should be made with the engine warm, after both carburetors have synchronized.
Remove the air filter.
Disconnect rod 1 (see picture) actuator, connecting rod 2 and cable 3 of the throttle actuator.
Move the intermediate lever 4 until it stops against the support 5 of the engine mount.
Start the engine and adjust the length of the connecting rod 2 so that at this position of the intermediate lever, the crankshaft speed does not change.
By acting on the intermediate lever 6, move the limiter 7 of the carburetors to the stop.
Press the accelerator pedal 8 until it touches the forced downshift stop 9 without pressing the forced downshift switch. In this position, adjust the length of the drive rod 1.