The BSA Workshop > Singles
B25.Starfire - Tachometer Question
JulianS:
One of the new Smiths electronic tachos would do the job, look about the same as the magnetic original. No need for mechanical drive.
http://shop.srmclassicbikes.com/product-category/smiths-genuine-instruments
Starphil:
The engine number is ED11089B25s
I'll check out the electronic option. Thanks.
JulianS:
The engine decodes as May 1970 build, E = May, D= 1970 season.
Quite late in the season, so would have expected it to have the port for the drive, but who knows!
Starphil:
Yes would have thought that.
Also, If you look at that part of the engine in the picture there's a seam just above where the port would be. I'm not sure if this is a normal part of the casting or indicates that there's been a repair. Not been able to look up close at another one to tell.
I suppose it's part of the fun of owning an old bike. I'm certainly enjoying it so. Plenty to fiddle with but nothing too major so far.
Thanks for responding.
Cheers
Phil
JulianS:
Phil
Not sure about your crankcase.
The 1970 engine would have had a pressure valve with enclosed spring and plunger and 2 parts, the outer hex being domed. Yours looks like the much simpler up to and including 1969 type which had a small diameter thread just one part plus a ball and spring.
Above your PRV looks like the poishing may be covering some weld repair caused by an engine blow up where the rod went into the cases - which happened to Starfires when thrashed by riders when they were new.
First photo is from the 1970 parts book.
Second from the 1969 book.
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