Mick at Total Traction gets my vote
He rebuilt and setup my bike
He's always got his hands on a few 2 strokes and has a great dyno setup
I'm sure Nigel with his Rossi rep would also give Mick his recommendation
You'd need to discuss how long you want to leave the bike, as he always has plenty of projects on the go
_________________
Why do things simply when you can complicate them