Carb help

I recently bought a 1985 xj700 maxim with very low mileage and a known carb issue (need throttle to idle when cold, high idle when warm) for a great price. When I was going over the bike topically before I bought it I thought that I was able to pinpoint the source of the high idle when I noticed a hole in carburetor 1's intake tube coming from the air filter. I took the bike home and tried my best to repair the hole, but ultimately had to settle on using duct tape to try and confirm that this was the only issue with the carbs (until I can get a replacement)

I taped up the hole, secured the clamp, and fired up the bike and sure enough it started a a lot easier than before, and was able to hold a 2000rpm idle with no choke or throttle (I am guessing the idle knob is still turned up a little bit too high from the previous owner messing with it not knowing he had a vacuum issue). However, after a few moments I the revs climbed to about 3500rpm for a second, and then retreated back to 2000, and then a few moments later the same thing repeated, and repeated and so on.

So im thinking at this point that either the mixture screws are not adjusted properly, or there is still some air leaking through my duct tape job. I sprayed carb cleaner around the 1st carburetor and the revs did increase ever so slightly, but not nearly as much as when there was the bad hole.

I should mention that the previous owner cleaned the carbs, and I haven't had them off yet to inspect that he did an adequate job cleaning out all the jets.

My questions:
1) Is a small hole in one of the carburetors going to cause this rhythmic bouncing with the engine revolutions?

2) Should I worry about the mixture screws?

 

I have to confess.....I've had my XJ650 for about a month now. I was VERY nervous about taking my carbs off and cleaning them. This forum helped me through the process. I got my carbs squeeky clean and I got my bike running like a top. (and I only got carb cleaner in my eye once) I also took the advice of so many other members of the forum and checked my valve clearances and replaced a couple of shims. I highly recommend that you do the same. Check everything from your airbox to your intake boots for airleaks. I used the propane method and had great luck with no leaks. As far as the duct tape job that you've cot on you carb boot, I would replace that boot or RVT silicone the crap out of it. Don't let the carbs scare you! There are enough knowlegable people in this forum that will help you get your bike squared away. There is absolutely no better feeling than the first time you push the start button after cleaning those carbs and it starts right up without hesistation. As far as your mixture screws go, your not doing a thorough carb cleaning without taking them out and cleaning them as well. Be sure to bench sync and do a running carb sync on the bike. You'll be so happy that you took the time to do it right.