Need help to pop off a clutch

Hi guys.I need some help to remove a clutch completly on a vintage snowmobile it is a tundra 250.I had remove the head of the clutch but my bigger problem I had now it is the back plate of the clutch.(I dont know how the name) I trying the puller brp,the puller 3 jaw,water and tefflon a lot,I have try to heat with a propan gun.A lot of the things.Yes the plate had move but not a lot.Thank you so much for you help.Sled:Tundra Lt 250 1989

Need help to pop off a clutch