While I was arsing around with the forks I thought I'd look at re-routing the throttle cables as they were a little tight on full lock.
I lifted the tank and airbox, unhooked the cables and re-routed them then put it all back together again and gave the throttle a quick twist to make sure it was all ok.
It wasn't.
I noticed that occasionally the throttle was hanging rather than closing fully - not ideal in any circumstances! So I cleaned and oiled everything that looked dirty, and tried it again, still sticky. Then I unhooked the cables again and made sure that the twist-grip was ok - it was. So then I actuated the throttle valve by hand and it hung up again. The springs and external linkages were ok so I wiped the inside of the throttle bodies in case I'd displaced a bit of dirt or something...
Then I saw what it was. The screws holding the butterfly valve onto the shaft of the front TB were slightly loose and the valve disc shifted just enough to not let it close fully. The solution - I loosened the screws enough to let the valve seat properly again, tightened one screw removed the other and used a teeny drip of loctite before refitting the screw. Same on the other screw then repeat on the other carb just in case..
