Double A did the 22 cent mod on his KLR last spring and while it ran pretty good for the first couple rides, it started backfiring at startup. We changed the plug and it was OK for a short while and then started again, as well as starting hard.
We un-did the 22 cent mod, changed the plug and that's the way it's been since, and has run perfectly, too.
What's good for one bike doesn't mean it'll be the same for the next, even though they're the same bike.. Double A's and my bike have the same plug, air cleaner, and carb settings, and my bike will start without a choke as long as the bike's even just remotely warmed up, where his requires a choke most of the time. He also gets 6-8mpg better fuel mileage than I do. The only difference is that his is a '98 and mine's a '02.. Other than that, they're identical..
Saying that, just because the 22 cent mod works well for other bikes, doesn't mean your's requires it.
Have you done this to your bike? I'd change the plug, first..