Clutch problems...

Hello riders:

I took apart my motor to change the main bearings, when I changed the clutch shaft bearings, I had to remove the big screw with the big spring on it (look pic), I had to unscrew it and then changed the bearings, the issue is that I dont know if I screw the nut to the big spring enough. Now when I ride, it appears that the clutch pads are slippery which there are not, from time to time the motor start to jump is like I engage and disengage the clutch from time to time. The flower nut is adjusted properly. Thanks for help.

thank you 2door, you're the best always!! I fixed by tightening the internal spring. OK, now I want to ask you some questions about porting, I have read a bunch of pages really a bunch, some say that you should port match your intake/exhaust at 26.5 mm wide, some say you could high the ports a little, some say only round the edges, seriously I don't know what to believe. In those pics are my ported exhaust port (my intake port is the same as my exhaust port 26.5mm wide), my tuned pipe and my crankshaft. I don't know if I ported the exhaust port correctly because I'm a noob XD I want to learn!!! My friend took his brand new motor to a mechanic, he ported it and now he runs 40 mph, with stock muffler, stock head, stock carb and with a 41T sprocket, I only run 35 mph with a tuned pipe , I could give it to him, but I dont want to pay $80, because I want to learn!!. I have a MM billet head, DaxRT carb with #70 jet, 39T sprocket, Bosch super plus heat range 8; the only thing I have not done yet is crank case porting and crank shaft balance, because I don't know what that is. I'm planning to study MotorBike Mechanic and I want to learn, so what better engine to start than this. Thank you for taking your time and answering our noob questions.

PS: I did those mods to the piston and really helped me a lot, also I now its backwards, because I'm a noob :'(

I'm goint to post it in the troubleshooting section, anyways Thank you!