To add to what skreemer said. You can ask here or make a new topic about shimming the jet needle. I always go with jet kits, but you may get some help and just try shimming if you're concerened with cost.
I just want to stress that it's important to get the needle circuit right. It's the most important/most used circuit in my opinion. Taking off the air box lid will significantly increase air flow. Enough to make the bike run too lean with a stock positioned jet needle. So be sure to raise it. If you use a shim, I think the equivalent of 1 position (if you had an adjustable needle) will be enough. A typical jetting spacer is about .022" thick and is used to raise the needle "1/2" a position. So you would want to raise the needle a full position, or about .044". I can't say for sure, you have to test, but I believe one full position will be enough. If it was rich at one full position raised, then you would have to try a 1/2 position change as I described. One of those two suggestions I hope will set you up right.
As for your main jet, I really doubt that one full size up is enough for a removed lid and pipe. For just the pipe, maybe, but not with the removed lid. Go up another full size and test. You may have to go larger than that. Do a full throttle test/plug read to see what's going on for the main. 1/3 throttle test for the needle circuit.
Don't assume the bike is running good, get plug reads. A lean mixture can fool you. The bike may feel strong, but if the plugs are running white, you'll over-heat the motor and bad things happen.
I just want to stress that it's important to get the needle circuit right. It's the most important/most used circuit in my opinion. Taking off the air box lid will significantly increase air flow. Enough to make the bike run too lean with a stock positioned jet needle. So be sure to raise it. If you use a shim, I think the equivalent of 1 position (if you had an adjustable needle) will be enough. A typical jetting spacer is about .022" thick and is used to raise the needle "1/2" a position. So you would want to raise the needle a full position, or about .044". I can't say for sure, you have to test, but I believe one full position will be enough. If it was rich at one full position raised, then you would have to try a 1/2 position change as I described. One of those two suggestions I hope will set you up right.
As for your main jet, I really doubt that one full size up is enough for a removed lid and pipe. For just the pipe, maybe, but not with the removed lid. Go up another full size and test. You may have to go larger than that. Do a full throttle test/plug read to see what's going on for the main. 1/3 throttle test for the needle circuit.
Don't assume the bike is running good, get plug reads. A lean mixture can fool you. The bike may feel strong, but if the plugs are running white, you'll over-heat the motor and bad things happen.