29-03-17, 09:20 AM
Update on this. I changed the float valves in the carbs, and also checked and adjusted the valve clearances (all the exhausts were a little low, the inlets were mostly fine, other than two which were at the low end of ok). Unfortunately this hasn't fixed problem. It's not running on cyl 1 and fuel is still coming out of the carb breather on that side. I did a compression test, and the cold values are 175, 150, 175, 175. So it looks like No 2 cylinder might be blowing back through the inlet. I guess the next step is to take the head off and have a look at the state of the valves, unless anyone has any other simpler suggestions?