Hi Jon,Post 713091
Test fitting the coils to the frame. I found a set of coils with the 99-1052 clips. With the standard spacers, they cause the largest part of the coils to contact the gas tank recesses. This is with the 2.5 gallon U.S. spec tank. I like this setup though.
'Fraid I've only just seen this post;
advance apologies if you've solved the problem already.
An educated guess says the coils in your pictures are Lucas
17M12 or pattern? When I was building up my T100, I also encountered problems fitting a US-market tank over 'em.
Afaict, the problem is - certainly on late-1960's US-market tanks - Triumph sized the "gas tank recesses" for the "Siba 32,000" coils listed in the late-1960's parts books; however, while 17M coils appear to have been Lucas
's '70-on response, the Lucas
coils have the ridge around the terminals end that the Sibas don't appear to have.
That said, I didn't fiddle around too long with a US-market tank; the UK & General Export tank has bigger recesses (the Lucas
MA coils are fatter), as well as being an Imperial gallon bigger. Unlike other Triumph ranges, certainly '67-on C-range UK&GE and US tanks don't look dissimilar (unless you have the two side-by-side) so the bigger tank doesn't look obviously out of place on a US-market bike.
Nevertheless, even with the bigger tank/recesses, I still had fitting problems with what were then being peddled by the trade as "standard" spacers.
In the end, I fiddled around under the tank for a ridiculously-long time (would've been quicker to take the engine out, measure and refit the engine
) to calculate the length of spacers that gave the same clearance between frame and coils and between coils and tank. This might also be an option with your bike's tank?
Btw, if the coils in your pictures are Lucas
17M12 or pattern, the "coil clips" in your picture aren't 99-1052. 99-1052 are sized for the fatter MA coils and, when used with the smaller 17M coils, the gap allows for some anti-vibe padding between coil and clip. Not sure what those similar-looking clips that actually fit 17M coils are, they weren't used on '70 UK&GE bikes with '70-on 17M coils; the British Cub parts company Greystone Enterprises sell 'em, so it's possible they were originally intended for mounting 17M coils on Cubs?