125-200cc WR 250 clutch not working when hot

Hi guys, I'm new to this forums so I'm sorry if this thread is in the wrong place.

So let's begin, I recently bought an excellent condition 2011 WR 250, all stock parts (even the speedo is working ), minor scratches here and there and barely used overall a beautiful bike for her age. The previous owner told me that the bike has sat for over 4 months, so I knew there will be some problems.

At first we noticed that the clutch was not working properly, when in gear with clutch in the bike stalled almost instantly, constant throttle blips to keep it running. But since the bike was not used in such a long time we didn't mind the problem.

So a mayor service was done (carb, brakes, suspension, fluids, etc). We find out that the water pump seals were bad so the bike sat for 4 months with gearbox oil full of coolant. Probably the reason of why the clutch was not working. Ordered some parts from Halls and the leak was repaired, no coolant in the oil.

However the clutch still was not working, so we replace the clutch cable. Nice smooth and light clutch with the new cable but same problem. So the next thing to do was to pull the clutch out, fearing that the basket was grooved (not quite posible since the bike has no signs of hard use but
who knows) obviously the clutch was in excellent condition, almost brand new (nice).

We adjusted the clutch rod to have more adjustment in the lever. Now the clutch work as it should, I can stand in gear with clutch in for a long time without throttle blips, but only when the bike is cold. As the bike starts to warm up and the clutch gets hot the old problem comes back. Also neutral is hard to find, I have to rev it a little to get in neutral.

This is my first enduro bike and I'm learning to ride this kind of bikes and terrain, so it's pretty annoying in tight stuff and turns everything much difficult. I have a love/hate relationship with my husky because of this, the bike is awesome and in excellent condition and I don't want to get rid of it. Any help would be awesome and thanks for your time. (Note: I'm using bell-ray gearsaver 80w and sorry if my english is not that good)

Fibre plates ok?

Thanks for the replies!!

Yes, they are almost brand new.

I put a brand new OEM clutch cable, do you think the motion pro will be better?

I think it's the oil weight. Double check what is to be used in your manual.