Does anyone know what the thread sizes are for mounting the engine on a 4xv 99 R1 engine.
I think they are 10 &12mm fine thread,can anyone confirm?

on my carb'd 5jj they were m10 fine.

m10 fine come in 1.00mm pitch and 1.25mm pitch
i think yours would be 1.25 pitch same as my blackbirds hope this helps
wayno!!!