Excuse the idiot question here, but is there any reason I cannot use some Brasso or similar brass polish on the brass coloured piping of my 1125r?

I don't see why not, but what brass coloured piping are you talking about? If it's the exhausts, then that's the colour that stainless goes when it's heated. Any abrasive (like Autosol) will do them

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If your dreams don't scare you, they are not big enough.

Wonder Wheels + Autosol pretty quick read the instructions works well on stainless used to clean my GS pipes well.

If you have some Brasso on hand, give it a try in an inconspicuous place - it might be about as good as the autosol on the stainless

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2006 XB12Ss..... 1998 S1W..... 1996 S2T
We do not need the help of our friends so much as confidence that they will help us when we need it. –Epicurus

I was also wondering where he'd found brass cloured pipes never noticed any on my Cr

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.