Final reduction gearing

[Crispy]

I'm about to try and order new chain and sprockets for my 71 K1, just unsure what to get. The sprockets that I have taken off the bike were 17 & 48 tooth all the technical data suggests 18 & 48 , any advice on what to get? dont want to get the wrong thing and smash my crankcase 

[hairygit]

Is it definitely a K1 motor? Reason I ask, the 750F1 had 17/48 because Honda altered the internal gearing to give closer ratios and quicker acceleration. If it is a K1 motor then somebody has probably done it to make it accelerate quicker or maybe pull a sidecar.

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[Bryanj]

It was the 16 tooth Honda upgraded because of chain breakage(to 17 tooth)

[Green1]

I have 17 and 48 on my K1's.
Saying that I should think 16 will be OK if you don't neglect chain maintenance as modern chains are far better.

[Crispy]

Thanks guys, yes it's definitely a K1 motor,  I'll stick with what I've taken off then 17, 48 just wanted to be sure , I knew I had read somewhere that Honda had changed the gearing to prevent chain/case damage just didn't know what from or to !