yes, you can block off the S4 mechanical OMP. The S5 is electrical and will go into limp mode if you disable it. AND YOU MUST PREMIX.
You have a few options:
If you have an S4 then buy the block-off plates and premix.
If you have an S5 then you can get an
Rtek and it will remove the OMP codes and can be blocked off.
YOU HAVE TO PREMIX IF YOU REMOVE THE OMP!!!! IF YOU DON'T THEN YOUR MOTOR WILL BE DAMAGED...
THat stuff you asked about is 2-stroke oil, the so-called "premix" I keep talking about....You put ~16oz. per tank IN THE GAS TANK at EVERY FILL UP.
Why do you want to remove the OMP?
Others will chime in with other suggestions.