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During 1952 the Burman ‘GB’ gearbox replaced the ‘CP and ‘BA’ types on all models and is of much cleaner appearance as the clutch arm is inside the outer cover, but it should not be confused with the so called ‘BAP’ gearbox fitted to Panthers and AMC models which is a ‘BA’ (or ‘CP’) gearbox with the same enclosed clutch mechanism. The internals of this gearbox are the same size as the earlier lightweight ‘CP’ model but appear to cope well enough with even the largest bike in the range. With the exception of the GB47 gearbox fitted to the HT all the GB gearboxes are identical except for a few important details. The SQ 4 version used a different kickstart ratio, a longer sleeve gear to give extra support to the clutch and a longer mainshaft to reach the clutch. The singles and twins are all identical but the mainshaft length was increased in 1956 to make room for the fully enclosed rear chaincase by moving the clutch outwards, at the same time the chaincase inner, battery carrier and engine sprocket spacer were also altered. If you have problems with the clutch rubbing on either the inner or outer of the primary chaincase, check the length of the large plain section on the mainshaft.
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