The bike carbs on the MA12 seem to have improved low end torque, but they can't provide enough fuel above 5000rpm, so the mixture leans out and you get misfire (which is clearly bad). The fact that you've gone from one choke to four of similar size, as well as the improved design of carb, means you can only really gain from this.
They are off a CBR600 which is a 600cc bike with a 12krpm redline. That's half the engine size for twice the rpm, so they should flow the right amount of fuel in theory, but I think effects to do with the air velocity and frequency of the pulses makes them misbehave. You can have them rejetted and fixed, but there are 3 jets and 1 needle per carb, so it would be expensive and very time consuming.
A 750cc or even bigger bike's carbs would probably solve the problem, but the engine they are on at the moment has a serious headgasket issue anyway, so it's something for another time. To be honest though, I think the reason that the bike carbs thing happened is cost - it's a dirt cheap mod.
Quickdraw, the reason I often seem to question what you say is because you are so often very imprecise with your language, so it's hard to tell what is going on. "Extrude Hone" is a trademark for abrasive flow machining, and a lot of machinists will dispute that it is honing. You hone the cylinder bore, or you hone a cutting edge. And boring out the head makes no sense.
Extrude honing is pretty expensive, and normally reserved for heads where it is difficult to get to places, such as engines with very long runners, or ones that aren't crossflowed. It also requires that the valve guides are removed, and that the valve seats are recut, which makes the whole job a lot more expensive than something like basic port matching.
Boring out the block for a 7cc gain (less than 0.5%) will gain you a lot less than 0.5% power. The reasoning you would bore out a block by that small an amount is to fit different pistons which will increase compression ratio, or be uprated to deal with higher RPM. I don't think there are any commonly available or reasonably priced replacement pistons for the MA series. I think, if you wanted to increase compression ratio, a significant gain could be made by skimming the head and using a thinner head gasket, valve to piston clearance allowing. It's all expensive work though.
I'm of the opinion that if you want much more power in a K10, put a more powerful 16v fuel injected engine in. You can easily spend over £1k on basic engine mods on the MA12 and end up with the same amount of power as CG13 with an induction kit and exhaust system. And at the end of it all, you'd have an engine on the verge of distruction all the time.
Keep us updated though.
