Clutch Problem

I've been searching the forum for this for a good while now and though there are similar questions, I couldn't find an exact match.

I've just had new clutch fitted (<500miles), I went away for over a month and so had the bike stored for the time. There was no problem before I left but on my return I've noticed a problem with the clutch.
As I accelerate it seems to 'hold' the clutch in, although the lever is fully out. So it revs all the way up to redline but only gradually releases the power, in small lumps.
This caused an accidental wheelie earlier!
Is it possible that the clutch is still engaged?
I've tried adjusting the cable play by the lever, and thats all correct.
Thanks for any help on this.

[yorkie_chris]

Check that the worm drive adjuster isn't wound in too far (not the most likely one..), check the cable isn't in need of lubing, check the worm drive isn't siezed.

thanks. the worm drive being the cable on the left of the engine that looks like a screw thread?
also if it needs a lube, what should be used? is there specific clutch lube?

[yorkie_chris]

The worm drive is under the front sprocket cover, the arm on the side of it is attatched to the end of the clutch cable.

You need to remove it, use brake cleaner or similar to get most of the old grease out (be careful stripping it, as the balls will go all over the place.

Then you need to repack it, I operate the mechanism, scoop some grease into the side of it, then seal my hand on the top of it and work it the other way, if you get it right then it pushes the grease right through the whole thing without stripping it down. (normal LM grease)

Also find a cable oiler, or use a plastic bag overnight to lube the cable, PTFE spray on the lever pivot.