Block off plates

[Stichill_imp]

Good job- but no need.

The pop off the main supply line hose to the airbox and plug it. I used a standard vacuum cap from the local auto parts store- small enough to invert and stick in the hose- worked perfect- and then put the hose back on the airbox. Easy enough to remove if needed...and my valve cover looks normal.

Those look exactly like the OEM reed valve in the valve cover of my CBR250R. It vents crankcase blow-by out of the valve cover.

The parts may be the same- but no, they aren't for crankcase vent- they blow in, not out. Air injection - the AI part of PAIR.

Well, I'll defer to your knowledge, 'Dubs. It may serve an identical function on my CBR. I thought it was a vent due to the amount of toasted carbon on the parts underneath it.