Hi guys, having some issues with my current cb750 project
My setup. 81 cb750c with delkevic 4 into 1 exhaust, Murray intakes with mikuni vm34 carbs. Ngk D8EA. Stock harness/ ignition.
Problem cylinders 2 and 3 not running or getting like warm.
So far checked spark timing with strobe light on each lead, timing perfect for all cylinders. Swapped spark units, verified valve clearances, compression test came back 150,145,145,140 from cylinders 1 to 4. Checked spark is bright and consistent. No vacuum leaks. Vacuum consistent in each intake. Swapped all plugs around, swapped coils around. Tested both doohickies on the crank which came back within spec.
Left coil wired blue to negative, B/W to positive
Right coil yellow to negative and B/W to positive.
Left coil to 1,4
Right coil to 2,3
I'm at a loss now as to what else to check/try. I'm based in the Republic of Ireland so replacement parts are few and far between.
My setup. 81 cb750c with delkevic 4 into 1 exhaust, Murray intakes with mikuni vm34 carbs. Ngk D8EA. Stock harness/ ignition.
Problem cylinders 2 and 3 not running or getting like warm.
So far checked spark timing with strobe light on each lead, timing perfect for all cylinders. Swapped spark units, verified valve clearances, compression test came back 150,145,145,140 from cylinders 1 to 4. Checked spark is bright and consistent. No vacuum leaks. Vacuum consistent in each intake. Swapped all plugs around, swapped coils around. Tested both doohickies on the crank which came back within spec.
Left coil wired blue to negative, B/W to positive
Right coil yellow to negative and B/W to positive.
Left coil to 1,4
Right coil to 2,3
I'm at a loss now as to what else to check/try. I'm based in the Republic of Ireland so replacement parts are few and far between.