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Muffler question

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5212.5 again.

Has the box shaped muffler mounted below the carb, up front. There are port adapters which have the oval shaped flanged that bolt to the exhaust ports on both cylinders. The muffler just slip fits onto these bolted on ports. Should they be snug? I've not noticed any exhaust blowing out, but loose just seems wrong to me. Makes for easier installation, but still... Do I dare try to clamp the thin muffler input pipes to the much stiffer ports? Who has small enough muffler clamps? Is it necessary?

I'd hate to bugger up a muffler, most likely, long ago out of production.

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