Ok some guys have been asking about drilling there clutch hubs and here's what I did to mine. I bought my 2016 YXZ 3 pedal used with a blown clutch and as soon as I got it before installing the new OEM clutch plates and friction discs I put 20 holes in the clutch hub and also doubled the diaphragm spring with another YXZ stock one. I have 2800 km on the new clutch and I am not easy on the unit. I avoid slipping the clutch for a long period of time and drive through the rough stuff with out stopping. I have just pulled the clutch back apart to install a rekluse clutch to make it easier for my wife to drive and took pics of the mod and what the clutch plates look like after 2800 km. I have reinstalled the clutch and did not need to replace any clutch plates and disc. some blueish on the plates which means it did get hot but friction discs are not dry and still have a lot of material. here are some pics. I have added 12 more holes to the hub since the images. total of 32. now this is me experimenting with the hub and I know what could happen if it failed. so use at your own risk. but i can say those little holes will not weaken the clutch hub much if any.