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drinkNdrop,
According to the Haynes manual I have up to 1968 the Bonnies were fitted with Amal Monoblocs Number 389/25 with an 1 1/8 " bore. I suggest that you obtain a worksop manual ans also an excellent book is "Triumph Twin Restoration" by Roy Bacon.
Darcy
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-Darcy-
BIR #174
"My eyes.....the goggles do nothing!"
Rainier Wolfcastle
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