Using Lead Additives in a Triumph TR6

Reader Contribution by Keith Fellenstein
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Using lead additives

Q: Should I use a lead additive in my 1970 Triumph TR6? Chances are the head has never been off. Also, can you explain to me how the choke system works on this bike? It won’t run when I pull the lever toward me. It only runs when the lever is away from me.

A: Most of the information I’ve read states that in normal use, other additives in gasoline provide the same protection that lead used to provide. During the initial switch from leaded to unleaded gasoline, there was concern that rapid valve seat wear would occur without the lubricating effect tetraethyl lead provided. Hardened valve seats were to be the solution. Experience has shown that the concern was unfounded except in the case of engines that were run very hard, i.e., racing engines. On your choke issue, the Amal chokes are off when the cable is tight and on when loose. MC

Motorcycle Classics Magazine
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