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Tech Corner

Technical Q and A for classic motorcycle maintenance and repair.

1966 Triumph TT Ignition

Motorcycle Classics tech expert Keith Fellenstein 

Editor’s note: If you’re having trouble with that old Suzuki, BSA or BMW, Keith Fellenstein is your guy. From motorcycle tuning tips to detailed motorcycle engine repair, he can draw from a wealth of experience to help guide you to success. Send questions to: Keith’s Garage, Motorcycle Classics, 1503 SW 42nd St., Topeka, KS 66609, or send an e-mail with “Keith’s Garage” as the subject.


Triumph ignition

Q: I have a 1966 Triumph TT with an ET ignition system. I have a five-wire stator and the armature has three holes in the back; S, M and R. Which one is the best for timing for street use and ease to start? How do I install the five-wire stator? It seems to me the end connections must be removed to get the wire through the opening in the tube. I am thinking the tube would be slipped on, then the ends soldered on. — Andy/via email

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A: The first part of your question is easy; the hole next to the S mark should be used to pin the rotor to the crankshaft for best timing for everyday use. The other two are for racing and will make it hard to start while giving better spark at high rpm. On the wires from the stator, you can remove the bullet connectors, but I’ve had good luck feeding the wires through one at a time. If the insulation has stiffened with time, careful use of a heat gun can soften the wires to make them flexible.