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Took over working on a friend's gsxr1000 k7 - it came to me with an exhaust leak. This pic is from the shop manual, showing where the exhaust gaskets (obviously) go. It has an aftermarket full system on it.
Here's the question:
Do these machined holes (MY RED ARROWS) at the bottom of each exhaust port have a function? Should they be plugged? Are they part of the old PAIRS system? thanks.
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Welcome. I'm not 100% sure, but I think those are the spark plug well drains.
 
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Yep. I think that’s right. I just blew some air up one of them and that’s where it came out.
Thanks
:)
Almost every bike I've had or worked on had drains, I just never checked where they exited on my GSXR. Thanks for the confirmation.
 
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