Lighter rockers?
FFS, be careful who you listen to there mate. Such things are really only going to make a difference on an engine that has several other modifications.
Before even considering lighter internals, consider your carb size.
By your own admission, you not really savvy with the "Ins and Outs" of tuning, so the wise thing to do would be grab a copy of Phil Irvings book "Tuning for speed" it covers stuff from that era, and if you read it cover to cover, you will decided for yourself,not only what actually makes power on an old single banger, but also what you can do for yourself.
Compression is always a place to start( that is, after measuring what you have now), and so is a camshaft.... I am sure you will be able to find a hot cam suitable for "sporty" road riding that already exist, and is well tested...those bikes have been round since Before Rossi was a twinkle in his dads eye.
It has been said already by others (cam compression carb), and with old designed single bangers, there is plenty of room for improvement in this area.
Will make it hard to start though!
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