Andy
Cheers for the info, so overall is it best to stick wirth PJ's and the standard + and Y pieces if running airbox or go for blanking the PJ's, running airbox modded with HRC + and Y?
Will try the jetting suggested next weekend if i can get a smaller PJ by then and do a quick run on the road rather than drive 1 hour to the Dyno. If that does not work then i suppose its an engine out to check the left crank seal.
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MC21 300
Aprilia RS250 track bike