Swapping carbs with a 91

Has anyone sawapped carbs from a 91 KDX 200 to a 220? I have a 91 at my dispence for parts and what not, and I have heard you can get more power with the 91's larger carb. I am guessing more top end as it is a lager carb, but I also have a RAD valve, KB30 pipe, turbine core II. What kind of performance gains can I expect and what jetting changes? The 91 is jetted a little on the rich side, and my 220 is pretty much spot on. Will I have to go richer or leaner with the 91 carb on my 220? One more thing, will it just bolt right on to my RAD valve?

Thanks a lot, and I am looking forward to replies.

Thanks Dave, so let me get this straight: use the 91 slide, with my 220's stock needle? Is the stock 91 200 needle richer or leaner than the stock 220 needle?

Again, thanks, I'll give her ago tomrrow and post the results.

Well I did the swap and did some jetting on it today. So far I have a 150, 45, clip #2 pos. I think I am going to stick with the stock 33mm 220 carb for now. I cant tell any difference in top end power, but the bike does seem to rev out a lot quicker and feels quicker over all. I tend to ride more in the upper rpm range with the 35mm carb. I dont like the lack of torque with the 35mm carb vs the 33. When I snap it just off idle, the rear wheel just spins uncontrolably instead of wheeling like it usually does with the 33mm carb. There feels like more mid range but it flattens out on top just like it does with the 33mm carb in. I suspect a lean main, but I didnt have a new plug in while doin the plug chops, so it was hard to tell after a WOT plug chop. I got a new plug and will try it out agian tomrrow with a 152 or 155 main. But bottom line is, I dont really like the power delivery of the 35mm carb so I will just go back to the 33. I did keep the jetting specs so I will spend some time with it again when I have more time. Torque over horsepower for me thank you. ;)

One more thing, the slides are the same, just different cutaways. The 33mm carb has a 5mm cut away, while the 35mm carb has a 6mm cutaway. But the two slides will fit in either carb.

Dave, you are right. I did a visual comparison of the two slides and put them in either carb and they fit, so I assumed they were the same :o . I thought that it may have a lean main, and I bought a 152 today but have yet to try it in the 200 carb, but it worked awesome in my 220 today. I dont have much time to experiment with different jetting with work and such, but I will give it another try with a richer main and the 200 slide and needle combo.