Yes, we are picking on you. Anybody who can't jet a carb, ..., just hasn't had the opportunity or desire to learn how, yet. There is a sticky at the top of this forum that gives general information and theory, part numbers, etc. The only difficult part is getting those ^$^&%$ float bowl and top cap screws off. Make a trip to a hardware store for stainless allen head replacements and the problem is permanently solved. Everything else is easy, as long as some thought goes in to how everything comes apart. I take pictures, and I rebuilt my first carb in 1963. Oh, one more thing, the carb leaks gas, so turn the petcock off and run it dry before disassembly. I do carb work on a metal tray the size of a McDonald's tray, covered with 3 layers of white paper towels. The towels contain any spills, and keep any surprise parts from falling out and bouncing away. I print off the parts explosion so I will know before loosening any screw if there is a little spring or ball or something that may fall out. I place each part on a bigger-than-life-size blow-up of the parts explosion in the orientation it came from the carb. Such a system is relatively easy to set up and makes carb work much, much less stressful.
I recommend motorcyclists learn to do their own wrenching. Otherwise, motorcycling is too expensive to enjoy.
#130 main and about 1.25mm spacer under the needle is about right for 400-1200ft altitude and a stock bike, even most with a pipe, as aftermarket pipes generally make more noise than anything else. Pilot screw adjustment is a 5-second deal with a 3-inch long power screwdriver bit. Just to gain confidence, a newbie might want to disconnect the throttle cables, rotate the carb, pop the cap, and try turning the pilot screw. The significant difference even such a simple, free mod makes will be very motivating to pursue more in-depth tuning.
zannini, TW200s have come with at least 7 different main jets, 2 different needles, and 2 different pilot jets from the factory, depending on year and market. I expect if yours has a #126 main then it is a '07 or newer 49-state North American market bike. Correct? Go back to jetsrus.com and see if they provide that information. No? Well, maybe they aren't intentionally lying, maybe what info they provide is truthfull, but it is very incomplete and misleading. Also, they are selling Keihin jets as direct replacements for Tekei jets. The flow characteristics of the two brands is definately different--a #130 Tekei flows different than a #130 Keihin, enough that a novice tuner will probably have poor results and become disgusted and frustrated.
Avoid "jet kits" and other "shortcuts". Most don't work as advertised.
Post your location. Maybe there's a Tdubber nearby who will coach you through your carb work. That's the best and easiest way to learn.
