I've just adjusted the chain on my tracer only to find on the sprocket end of the spindle turns against the block marking it and also tightening the chain as it spins,I've got round it by holding the sprocket end with an adjustable spanner while my daughter tightened the nut which I've done to 110 nm as when I undo the nut it was no were near 150 nm,anyone else had similar problem? Have Yamaha changed the tensioner blocks under warranty?.