You`d be mad not to get the MC21 carbs if they come with an HRC kit.
Even though an MC28 will struggle to ever make over 55hp (in the real world, not the daydreamers' world!) with a standard card, if you do set about properly modifying it you will need all the adjustment & special bits you can lay your hands on. HRC jet kits are selling for £200~300 these days. Have a look on Yahoo auctions & you'll often see a box of goodies with a dozen bids or more going for 30,000+ Yen.
Remember, Honda was long past looking for performance when the 28 came out, & the whole bike was softened for the street. The carbs are a bugger to work on (try adjusting an HRC needle in a set, then do it on an MC16~MC21 & you`ll see what I mean), the suspension is soft (although the SP front is a good cartridge design), the Pro-Arm flexes (in-built passive steering), and the ignition is flat.
A 300`s not going to have much impact unless you get an HRC card, & even then (again, in the real world) you'll be lucky to see much over mid-60`s. Still, at least with a standard PGM-IV the chocolate pistons might last a bit longer.
Hmmm.... let me think.... 300 kit, £1200.... Tyga pipes to fit the 300 barrels, £500... HRC card, probably £200+.... all for an unreliable 65-68hp!
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