| Listed in parts books | Not catalogued by year yet |
TAP TRI TACH DRIVE S1871
A 1/2 x 20 left-hand thread tap for cutting or cleaning Triumph tachometer drive threads, shop ref S1871.
This is a tap, not a bike part in the usual sense - it's a workshop tool for cutting or cleaning out the threads on a Triumph tachometer drive fitting, referenced under shop number S1871. The 1/2 x 20 LH callout tells you it's cutting a left-hand thread at that size, which matches up with the left-hand thread commonly found on tach drive housings and cable ends on these machines.
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We don't have much more on file for this one beyond the basic tool description and its old S1871 reference number, which also shows up as 2584A37 in some listings. If you're chasing down a stripped or damaged tach drive thread and need to true it up before fitting a new cable or housing, this is the tool for that job.
Give us a call if you want to confirm this is the right tap for your particular tach drive setup before you order - we'd rather get you the right tool the first time.
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