I have a 2000 VTR. For a while now I have had what seems to be a shudder from the gearbox that rattles down the chain when starting in 1st. Is really evident when another person is on the back and give it a fistfull. Have had the chain, sprocket and outer gearbox changed, along with a "They´re all like that mate" from the mechanic. Anyone else had issues?