Total rebuild of a 95 Blaster

Ok, so I was curiuos on what year my blaster really was. I cleaned all the paint off the frame down to the #'s. It turns out it is a 92 by the vin# and not a 95. Doesn't matter though to me. I only got it for $150.00. I got everything pretty nice and now when I ride it and hit 3rd gear it has a stutter about 1/2 to wot. I'm thinking the carb needs cleaned real good again, but I am throwing this out to all of you. It starts and idles great. It's just when I hit 3rd gear. I can go through all the gears if I don't give it full throttle. 1/4 to 1/2 throttle is ok. Could my main jet be clogged? When it happens and I let off the gas a little, it will clean itself out and go until the next gear. Just looking for some advice. Thanks
 
ok so I did some more work on the Blaster today. I cleaned the carb again and cleaned the air filter. I found out it has a 230 main jet in it. I am running the stock air box closed and 32:1 gas mixture. After I cleaned everything again my problem seemed to go away. I also changed the transmission fluid. There was hardly any fluid in it. I put 650ml of ATF type F in it. Thats ok right? It seems to run strong now throughout every gear. I am waiting for my new graphics to come now, which should be tomorrow. Hopefully I can get some pics up for ya all. Thanks for all the help by the way.