The PAIR system injects fresh air from the airbox directly into the exhaust port to burn any extra hydrocarbons left over after the combustion cycle. On a race bike we don't worry about such things and there is a significant weight savings to be had by removing the system, not to mention space and complexity savings.
Here on the valve cover you can see the two silver covers that are on top of the reeds. The nipples on the tops are plumbed into an air pump, which draws from the airbox. The entire air pump assembly can be removed and discarded.
Remove the covers.
Here are the reeds. Remove them.
Pull the baffles out.
And this is what's left.
Unfortunately the screws don't often want to screw out, but you can grab the head with a pair of pliers and snap them off, then the remaining threads will unscrew easily. You can toss everything shown in this picture, baffles, reeds, stiffeners.
Then reinstall the empty plates. You need these to be installed in order to have a good seal and no cross-flow between cylinders 1/2 and 3/4. Not a bad idea to RTV silicone the rubbers to ensure a perfect fit.
Install the block off plates - these are made by Driven and are very nice kit, money well spent.
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