I have a low milage RD 400 that sized 20 years ago so the then owner poured oil down the bores, put it in a shed and did nothing with it.
I brought it from him a few months ago and that oil has turned into tar so I will need to get the crank split, new bearings and seals and reassembled.
It will also need first oversize pistons.
Ok, the question is where is a good place to start? and does NZ have a RD guru
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