If the chain is showing signs of heavy wear, suggest replacing both the bar and the chain. Check the sprocket on the clutch hub for heavy wear on the teeth which will hasten wear on the chain teeth. Check chain oiling by running the saw tip near some cardboard at speed for a moment or two--it should throw off a thin line of oil. Tighten the chain until the lower run of chain just comes up to the bar, but not so tight that you can't turn the chain by hand. Hope this helps!
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If the chain is showing signs of heavy wear, suggest replacing both the bar and the chain. Check the sprocket on the clutch hub for heavy wear on the teeth which will hasten wear on the chain teeth. Check chain oiling by running the saw tip near some cardboard at speed for a moment or two--it should throw off a thin line of oil. Tighten the chain until the lower run of chain just comes up to the bar, but not so tight that you can't turn the chain by hand. Hope this helps!