Just to confirm, this is absolutely fine. I ran a PGM-IV with a complete MC21 engine (carbs and flywheel), opened up mc28 pipes, modded airbox, jetted to suit.
Went quite well, quick enough on the road to keep up with any 250/400 bikes.
Flat and boring right at the very top though as are any PGM-IV's without the HRC card.
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