Triumph Thunderbird 6T Fouling Plugs

Reader Contribution by Keith Fellenstein
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Q: I’m trying to find out if I have the correct carburetor and jets on my 650cc 1966 Triumph Thunderbird 6T. I’m having trouble with fouling plugs after a rebuild. Who can I contact, or can you help me? I have tried contacting Amal


A: I looked through the manuals I have from Kim the CD Man and came up with two options. It looks like 1966 was the last year for the 6T. You should have the Amal Monobloc kitted out like this: 376 carburetor, 230 main jet, .106 needle jet, needle type C, clip in position #3, slide 376/4, pilot jet 25. Should you for some reason have an Amal Concentric, the setup is as follows: 930/23 carburetor, 230 main jet, .107 needle jet, standard needle, clip in position #2, slide #3. Hope this helps.

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