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1969 BSA royal star problem

1702 Views 2 Replies 3 Participants Last post by  mikeo
i bought this bike and it ran like a champ until i took it to work one morning about 2 weeks ago...........on the highway. since then, 3 things have happened. the voltage meter that is built into the headlamp came off (small problem), the speedometer stopped working (slightly bigger problem), and there is a "puttering" coming out of the left muffler. single amal carb. no puttering when i accelerate, only when i am cruising at a constant speed. it is a fast puttering. i dismantled the speedo and found that the square metal tenon that is inserted into the back doesn't spin when i'm riding, which must mean the part that is attached to the rear wheel is broken. any suggestions anyone?
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I would be suspicious of the carb for the puttering. Amal concentrics are not really very good carbs. If it original or been on the bike for few miles then I would look at the idle circuit and/or replacing it with a brand new one, or better yet a brand new equivalent size monoblock (which in my opinion)is a better carb.

As for the spedo its most likely the cable. The inner cable should pull out from the spedo end and have square "tenons", as you call them, at either end. My bet is its broken. If you get a new one get the whole thing (inner and outer). They're available any where that sells vintage british parts.

Mike O.
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