I agree with most of that. But if you still want it reliable...
T-5's, Cool Head w/ 19cc domes, Vforce3 Reeds, K&N Pro Flow intake, and while you are at it doing a top end, might as well bore it 20 over. It will be quick. Will have to run 100 octane. Mines been like this for the last 4 years.
I have everything but the bore and am side by side with my buddies modded yfz and I'm fat! (not a typo!)
Mine is a 98 with the stock top end. Gotta love that Yamalube at 32:1! It is tired though and still stays side by side. Compression is way low and getting harder to start the first run of the weekend, but after that starts first kick rest of the weekend.