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2006 150DH Fly wheel speed die off

Stihl Unknown

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I've a 2006 150DH its second hand but its been great for the 2 years I've had it. Recently When putting over 3-4 inch wood through the machine's power dies back. Now as far as I know my model has no stress control (or its never worked) So I've always been aware to reverse and refeed if the machine struggles but it's been ok previously with the same size/volume of wood.

I'm looking for some advice, for some reason I was thinking the belts need tightening? but I'm no mechanic.


Kind regards



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