You probably have dirty reeds if carb cleaner helped. Pull off inner airbox, loosen bands around throttle bodies,pull off the airbox guide/rubber. Now it gets fun. Must take off heated carb line on mag side of carbs(throttle bodies), be sure to plug the line somehow, you will lose quite a bit of antifreeze. There is also and elec plug on the mag side body. You will also need to unhook the throttle cable, loosen the 2 nuts and slide the cable casing out of the hole, then unhook the cable end. Loosen the 2 bands on the reed boots/throttle bodies and pull them out. Clean as needed. There are 6 bolts on each reed cage and they are fun to get at. After you get the bolts out the reeds/boots should come out. FYI the reeds will come out of the boots in 2 pieces each side. Clean as needed. A flex-style extension on a 1/4 in. drive ratchet helps alot on the reed bolts. Have fun!!.
...MAX