Cheers bud, the rocker cover gaskets leaking a little bit so I'll have a look whilst I've got it off to see how badly the lobes of the cams is worn.

Would this also cause the retardation on ignition if it can't physically get to the revs I'm trying to achieve?

P.s: - would you know how much my rare clear and smoked S1 rear lights would fetch as I may need to off load them to raise the cash to do any repairs? They are are as new, still have box and packaging.

Cheers for your replies,

Dave