I have a old nsr250 mc21 se/sp engine for sale.
it has dry clutch and correct L cylinders.
it had apparently been rebuilt (I'm talking 15+ years ago)
pistons do look brand new.
I'm pretty sure it has a new honda crankshaft installed. the webs look brand new as does the thrust washers/ rods when you look through the Reed valve.
it will need stripping down as some moron before my ownership hand painted it red with a dead chicken (must have been a fan of the old red rockets!)
£2600
collection from lincs UK or I can post.
I'll add pics on Monday