I've posted previously about Husky 345 - sudden mechanical 'knocking' noise.
Finally had time to take a closer look at it - spark plug heavily fouled with black debris and muffler port has 'stringy' black debris melted on it - kind of looks like short strands of black poly rope.
What are the seals on the crankshaft bearings made of - could they be source of this stuff?
With plug out the engine feels smooth when turned by hand, no clicking or catching.
Finally had time to take a closer look at it - spark plug heavily fouled with black debris and muffler port has 'stringy' black debris melted on it - kind of looks like short strands of black poly rope.
What are the seals on the crankshaft bearings made of - could they be source of this stuff?
With plug out the engine feels smooth when turned by hand, no clicking or catching.