ZXR400L1 running bad after maintenance

[Stijnzxr400]

Hello everyone,

I am having some troubles with my 1991 Zxr400. Bike was running great, until last weekend when I did some maintenance. Chanced spark plugs, oil and oil filter and sycronised carbs. At first everything was all good and bike was running great. Now I suddenly having problems that the bike is not running on all cylinders all the time. I am almost certain it is ignition related. The first thing I did was check all the wiring that seems al good, then I swapped the old plugs back in. I also checked the coil resistance both coils are 3.3 on primary and 25k on secundary, messured with wiring and caps. But it keeps running bad. The other thing I noticed is when the bike is completly cold it is running on all four, but after about 30 seconds you can hear the bike starting to run bad and I think misfiring. When riding it is mostly below 6k rpm after that you can hear and feel that the bike is running on all 4 again when on throttle, off throttle you can immidiatly hear the misfires. Bike got new battery and rectifier last september Could it be that the CDI has gone bad, or does someone have other suggestions. I hope someone can help me out. One last thing is sometimes when I start the bike it only clicks( like the battery is dead) but then after I turn the ignition off and back on it starts. This was also before I did the maintenance but seems to be a bit more often.