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There is no fix needed. If Stihl made it that way, it will last.So how would you fix that? Would you have to raise the roof to round it off whitch would change timing?
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I'm wondering if we are too hell bent on the roof arch.
Remember, even with widening of the port, it's still opening gradually. It's only wider for the first 20* if it's squarer. I hope that makes sense.
There likely a fine line between how flat you can go and how hard it is on the rings.