Im running the 4C-team and are really glad I bought this engine! Its a killer

But yesterday I bumped into problems, my engine was just stalling on top... I was at the euros an ran 30% byrons and here at home I run 25%. Haven't touched the head shims. Tried another engine, and it worked good (no prob's with the tank or fuel lines or clutch).

I kept on turning the HSN out, but without sucsess....



Have anybody else had this problem or any hints that can help me?