| What Fordie said, but you might want to check out whether you've got any fluid leaking from your clutch master cylinder, clutch slave cylinder or any of the joints in the hydraulic line.
Sounds like the same symptoms that I had when my clutch slave seals were leaking. Basically, that means that the slave cylinder piston has some fluid pushed past it instead of all that fluid helping pump the piston out, therefore it doesn't move as far. When that happens the clutch plates don't disengage as they should and will drag, giving exactly the symptoms you describe.
bleeding the clutch helps, but if you've got any leaks you'll find they get progressivley worse.
You don't say what year your 748 is, but since it's an SP I think that the clutch slave cylinder down by your left boot will have a smooth top on the cylinder with a raised circle inside that. If so, this is notorious for deals going pop. You can replace the seals but you may find that the cylinder is scored because it picks up all the gunk of surplus oil and road dirt from the front sprocket, so replacing the seals won't cure it (or will only be a temporary fix).
If this is the case, look out for a later uprated one. There are usually one or two on eBay and they look as if they've got a big torx head in the centre.
Or if you're feeling flush, you could go for a bling one with a bigger bore that will also lighten the clutch action. You can get these from loads of places STM, MPL, Tecmoto, JHP etc...just don't go for one with too big a bore otherwise you'll find that it's a pig to bleed through and may give you exactly the same symptoms you've got now (because the bore is bigger it doesn't move as far for the volume of fluid your master cylinder can pump). I would reckon if you go for a bling piece of kit, go for a 28mm rather than a 30mm  | 
Jools
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