TBF the NSR throttle isnt far off 1/4 turn anyway, i actually use a NSR throttle body on my NC29 trackbike as the cam is bigger making it 1/4 turn.

in my years of NSR ownership the only ones i have seen are on Jamies site
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold