Hi, Walkman.
Check if all cylinders fire on idle by exhaust runner temperature.
First check your plugs. Make sure all are clean from
oil or other greasy deposits.
Close mix screw on 4 & 8 while idle and let it run for a while. Any difference? Now turn the mix screw
just free from the seat. Any difference? Any further, small movement might make a huge difference. This might take som time to figure out....
If you don't get all cylinders fireing, there has to be some other problem
- No spark at those cylinders?
- Damaged mix screw or seat?
- Other carb problem. Too fat mix screws?