125-200cc How bad is my damage? Aftermarket clutch basket for WR150/WR125?

Have a look at the rivets on the new basket. On ours we found that new basket rivets are not as flat as the ones on the old basket.
We put a small washer about 1.4mm between the basket and the drum to give a bit more clearance that fixed the problem.

Interesting. I noticed that when I have the old style basket in there that my clutch was slipping a lot. I can't tell if it's due to the basket gap being too large (which would be taken up by the thicker washer you mentioned), old clutch plates, the Relvoc autoclutch, or the new 80wt oil I'm using.

Since the springs should be holding the whole thing together, it doesn't really make sense that having the thin washer in there would lead to clutch slipping does it?

I recently changed my clutch plates on my 2013 CR 125 with an ebc kit, both steel and friction and found that i couldn't take up all the slack in cable, i ended up putting an extra washer on the bearing to push the pressure plate. Checked the drawings,all looked similar, so ordered up new cable, thrust shaft, ball bearing even the washer between basket and hub and bearing washer still the same. Rode the bike last week and immediately had to adjust the slack out, rode for a while and had to adjust. After the bike cooled down had to re-adjust all the way back so the bike would even pull away and then within a lap back to adjusting up slack, i must have missed something but the workshop manual shows nothing different to what i have, any ideas?

Measure the EBC clutch plates, they may be a different thickness.

And count them Make sure you have the proper number of plates in the proper order.