I figured locating the kicker as close as possible to the flywheel would allow minimum tolerances for flex between the kicker gear mounting plate, and the engine. It also will negate/minimize any misalignment and adds strength with the applied leverage. Before assembly, I thought about welding a gusset on each side of the 3/4" pivot point, and adding reinforcing to the kicker lever itself but I can do that later if warranted. Without seeing your bike, I'd just be guessing but, I wonder if "tipping" your engine/crank gear downward, towards the pivot point (kicker gear) would help? You could accomplish this by adding a washer (or 2) under the engine using the 2 mounting bolts on the clutch side. See crude drawing LOL...