Evening all just a quick up date as I had already put a big engine on the 4x6 a petrol vanguard which is a good engine I just thought to my self can I go bit braver and put something even bigger in there like a 2 cylinder kubota engine anyway here is what I have done so far
I have done that plenty of times mark or a drop down carb in a seringe , or you could get a graphite pencil and scape it on the plug I do that with my old stationary engines and that makes them bang