andyo wrote:
...i would carry out the wire splice then you have full power all the way up (easiest job of all)...

There is no "wire splice" for the MC28. Well, technically, that's not correct, but the MC28 splice simply allows you to run an HRC card (which must be coded to the PGM-IV) on a road/street harness.

Fitting aftermarket chambers, opening up the airbox, and fiddling with the flywheel (timing) will give a power increase, but you'll still be wasted by any delimited 400 or MC18/MC21 in a straight line. In my experience (that's the key word, experience, not hearsay!), you'll be lucky to get much over low 50's hp without also running an HRC card and jet kit, it should at least then rev however. This will allow you to run slightly taller gearing, giving a little more top speed, but remember you need horsepower to drag you and the bike along at any substantial speed. The OEM gearing (15/44) is good for 154kmh @ 10,000rpm (approx 115mph @ 12,000rpm). You should be able to run 15/40, which will theoretically see you with a top speed of around 125mph... IF the motor can pull it! 50hp and 15/40 will still feel pretty weak, but 15/40 and 40hp and some rpm is gutless!

Simple truth is the MC28 needs all the help it can get, but it can be made good... it's just not going to be cheap. You can grind the washers out of the headers in the OEM pipes, but the pipes are crap, so don't expect anything but RPM. Again, simple truth is OEM MC18 and MC21 pipes work, MC28 do not! 88~93 pipes are all capable of allowing the motor to make almost 70hp, and anything from 89 onwards will also need the silencers replacing, as the OEM ones are progressively choked, model on model, with the MC28's again being the most heavily restricted.

As Dana and Andy have already mentioned though, make sure the RC Valves are set bang on, as it can have a huge effect on power and RPM. Not good when you only have 40hp to play with!

At the end of the day, if you want any kind of true performance out of an MC28, you have to get your hands deep in your pockets. There's no cheap shortcut. Yes, they may be lovely to ride in standard form... alone, but ride in any group where the other bikes are all making at least 50% more power than your stocker, and it will soon wear you down! The niggling thing is the MC28 motor has at least 60hp in it, without even touching it, but you need the extra (now very costly) bits to release it. That's the price you pay for "progress"!

Cheapest way around all your problems? PGM-II and harness! Easiest way? Re-coded PGM-IV card to 010 or 030 spec, aftermarket pipes, HRC jet kit, and preferably open carbs. The easy option will cost ten times as much as the cheap option today.

And please don't PM me for technical info. If I answered every one of my PM's I don't know when I'd ever breath fresh air again!
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Andy.
NSR-WORLD.COM

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