BTH

British Thomson Houston also supplied the British manufacturers with magnetos, some Velocettes and some Triumph pre unit twins had these quality ignitions. Some parts are available, this is all.

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BTH SINGLE SLIPRING
MAGBTH1
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Hole 17mm. Diameter copper part 29,16mm. Wide 16,40mm. Outer 49,8mm

pick up BTH screw in type
MAGBTHR21
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