Ducati 250 GT 1965 Instructions For Use And Maintenance Manual page 34

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(Fig. 3)
7th. - To be on the safe side, it is advisable to repeat the
test.
8th. - If the reading should not tally with the requested
numbers, then loosen the two screws (A and B)
which secure the plate, and rotate it, advancing or
delaying ignition until the right number found at
page 28 is obtained.
9th. - Bear in mind that if you let go dry the felt which
lubricates the earn, the fibrous slipping block (that
operates the opening of the moving part of the con-
tact breaker arm), will tend to wear out, lowering
thus, the value of the gap.
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