Motorcycle Repair: help with katana, suzuki katana, going berserk

Question
91 suzuki katana 1100s gsx. been having issues with it for two years. hardly got to ride it last year or this year so far. usually races it at byron, il. had stage three carbs put in beginning of last summer but found out the guy said he did and didn't really do it, only took the money. Kept losing 1 and 4 cylinders, had no spark, did plugs, tried different solinoids, that didn't do no different. re did the carbs etc. It would run great and then NOTHING!!!! Like it was like blah... no power nothing, was misfiring etc. (remember, this has been going on for over a year) we checked compressiion, that is fine. So every time we thought it was working good, after like ten minutes of riding it hard, it was blah again. The cdi box kept getting really hot and it was actually killing the bike. We took the cdi box off and it was melted some, like thru to the inside of it. so we put on a new cdi box and we have spark on all four cylinders and it sound great... however, it has no power. it used to do 132 mph which was a 10.98 sec now it is doing 116 mph which is about 12.30 sec. it dropped 14 mph in the quarter mile.
do you have any idea what else it could be? we can't even pop the front tire off the ground.... we need the power and fast. there is a race on sunday next week and we were hoping to figure it out by then.... or atleast in time to enjoy it some this year!

Answer
Christa I have no idea thats concrete. Check the output of the charging system to see if its over charging. Put a volt meter on the battery terminals with the bike off. Then fire up bike and test with it at idle. Then rev engine to about 3000 rpm and test again. Off if the battery is good it should be 12.3 volts at idle it might be 12.6 at 3000 rpm it should be no higher that 13.8 volts if it is the voltage regulator that controls the stator output might be going berserk and frying the CDI.