I have recently had my MC21 rebuilt. Just back to std. It has std chambers (you try and find anything decent in australia) with some custom mufflers (stainless 1-1/8 ID, 2-1/4 OD, 9" long)

I havn't done the wire splice de-restriction yet. But i want to mod the air box lid by cutting some holes in the top of it.

It has been mentioned in other threads that the main jets should be swapped for a larger item. Is this an easy job ? Do i have to take the carbs off, or just dissassemble them on the bike ? Should i change the needle position as well ?
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