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The first time I saw a 442 with tripower I thought the hand bent copper lines on the end carbs looked homemade by a shadetree mechanic. Decided to do mine a little different.....
At the time, I thought the copper lines looked odd for another reason...
Copper work hardens. The constant vibration would carry a risk of line breakage. The factory must have tested this, and I didn't hear about any engine fires associated with that potential problem.