toysforbigboys
70cc twin V2
You can't just incorporate a hole in the firewall?
well from the diagram I added it said from the prop hub to the engine mounting holes was 172mm...well the plane I have from the firewall to the cowl opening is 6 13/16 inches (173mm) the motor head would be up on the firewall according to my diagram
the diagram that you provided from prop hub to standoff ends is 172mm so I get some spacers and I am good, with no mods to the firewall