Tom, see Fontyyy's post in this thread regarding exhaust washers..........

http://www.nsr250.net/forums/viewtopic.php?t=8594&postdays=0&postorder=asc&start=0

And also see TYGA website for more tips on elevating the MC28 from 40 BHP.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30