Yamaha exhaust height valve problem

yam125-DSCN3513Enclosed a photograph, where we show you how we make the tension of the torsion spring stronger which is controlling the axle of the exhaust valve.

What happens,

The, exhaust altitude valve of the Yamaha YZ 125-05 rattle in some cases resulting in quick wearing of the whole thing, followed by real damage with as a result being a break at the torsion spring and stocking the valve, followed by overheating and so on.

By means of engraving a groove of 0.5 mm deeply in the Pick-Up the spring becomes more tightly around the axle from the valve, and the whole problem is solved.