Rear sprocket +2 teeth.. new chain needed?

[KungFooBob]

You need to replace the chain, front sprocket and rear sprocket with the shaft drive assy. from a 1989 BMW R100GS.

[S1OPP]

It is commonly accepted as best practise to replace chain and sprocket as a set, this avoids excessive wear on the new sproket by the old chain.

or something.

[KungFooBob]

also, if you've changed the rear sprocket you'll have to inform your insurance company of the modification or you'll be totally uninsured should you have an accident and run over a orphan.

[S1OPP]

Would it be ok, if you had an accident that didn't involve orphans?

[KungFooBob]

Yes, you'd only be un-insured if you hit Orphans, Kittens or people called Ronald.

[S1OPP]

Fair do.

God help you if you hit an orphaned kitten called Ronald.

[KungFooBob]

They lock you in the tower of London.