The NSR engine must be one of the easyest engines ever to rebuild!

The power valves are so simple once you see how they work. Its only a servo motor with 4 cables at the end of the day.

As for the cost of motor. If its fully locked up then your looking at... round ish figures here....

Crank, £550
gaskets, £40
seals, £50
Little ends circlips, pins, dowls etc £100
pistons and rings £200
two barrel replates, £300
bits and bobs £20

That really rough rough but a full motor rebuild in parts will be about that. £1260. Thats about $2400.
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If I have to take the carbs off once more...