Yeah, just before, like about 2 minutes before as that is likely to both increase power and require a jetting change.

Dave Ett has a cracking story about the folly of running an NSR with std jetting on Tyga racepipes and a modded airbox lid.
It's not a long story and it wasn't a long ride.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread