I am in Ireland and have a twin engined R.I.B with a pair of 2001 mariner 60 4strokes fitted,The stbd engine has developed a missfire from about 2500rpm,I have swapped the carb bank over from the other engine thereby eliminating all possible other causes.The fault followed the offending carbs to the other engine. I have cleaned each individual carb,rebuilt,and synchronised the bank and tried the engine again on 2 occasions with no great success.Can any one offer any inspiration as to where on which carb the fault may lie? Thanks
