Cu engine blowing back through carb on L/H bank.
Posted: 26 Jul 2022, 20:52
Can’t work this one out. Engine has twin Webber carbs. Valve lifters replaced 1k miles ago because of same fault. Head replaced because it dropped a valve seat 500 miles ago. Luckily the seat stayed in one piece so no piston/bore damage. Mixture, timing etc all spot on. Now it’s doing it again. Help please!