I seen the Greeves entered in a trial in Ireland a few weeks before the Scottish. A bit agricultural in terms of finish and there would be more poke in a 125 gasser, but when I build and develop a bike as good I'll criticise- maybe a few on here should take note.
this is the northern ireland trials website, http://www.knockmotorcycleclub.co.uk the majority of the trials are in co down so from Londonderry you are going to have a fair trip ahead of you.
i think JAck Burnicle does an excellent job, the downside about internet forums and why they get a bad name is because of pricks starting topics like this.
It makes the bike much more pokey low down, do you think S3 are going to develop and sell something that restricts performace, I'm no Gordon Blair but I would guess that much. If you dont know who Gordon Blair is google him.
The ones with NB on them aren't magnesium, it is a Nigel Birkett aftermarket one, these were popular replacements in the day when the original magnesium yamaha one smashed which was a regular occurance.