Adapting a later cast aluminum tank to a 1940 twin was not quite straight forward, but, not
that hard. Note the mounting holes are drilled oversize to allow a little slop…part of fit and try
The tank bracket had to be fitted to tank first then the magneto plate installed…no way to
fasten screws with magneto in place.
The 1940 twins used 2 short piece tank bracket. which were too short to reach tank mounting
studs. Later tank brackets are one piece.
Back fitting the later bracket did not require any alteration to crankcase. All fastener
holes were over sized so tank could be dropped in place without forcing. Ears on upper
water jacket are often found to be damaged by rough handling so best to be as gentle
as possible.
Louis
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