Hi, ive just bought a 2004 315 to start with trials and it had bad clutch drag to the point it would constantly stall and be impossible to find neutral ect ect.
I renewed the master and slave cylinder o rings, bled countless times, tried various oils/atf, nothing cured it.
When I bought the bike it had the oem paper/Cork friction plates and aftermarket dimpled steel plates (1.5mm thick, 0.1mm thicker than oem steels) I presumed this was done my the previous owner to try and cure the drag without success.
The issue was really starting to annoy me by this point.
Next I contacted H&D racing and the guy offered me lots of advise, he advised me to use oem Honda smooth steel plates (1.4mm thick) with H&D aftermarket friction plates and the reccomended elf htx740 oil.
I recieved these parts and fitted them to my bike, I wasn't holding by breath on it being cured by this point.
I fired the bike into life, let it tick over for a minute or two, selected 1st and was pleased to find there was no drag whatsoever. I just hope it stay drag free.
So if your having issues with clutch drag then I would reccomend the oem Honda steel plates, H&D racing friction plates and the correct elf oil.