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#883548 06/22/22 2:52 pm
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Hello; any of you with a 9989 camshaft (Harris made) on the bench can tell me if the hole threads in the TS are UNF or BSF?

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Thank you mate.

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20 tpi, same as bsc? I know that the earlier nut fits, as does the factory assembly tool.

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Hi TinkererToo; the hole is for 1/4 so if it is UNF should be 28tpi. Seems that you are talking about the external thread.

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Sorry, I was, can you get a 1/4 UNF tap in Uruguay?

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Hi; I dismantled there to be sure what I did in the past and found the screw a bit loose but UNF. I tested a BSF but did not worked. Would be very very frustrating tear up the cases to fix that but seems that I did the testing when I built that.
Yes; there are UNF taps here.

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Just run a tap up the hole, it goes no-where else, so no need to dismantle!

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I removed the magneto to check that but I do not think that an UNF tap into a BSF thread can make for a good tight hold for the taper of the magneto to the camshaft; anyway was UNF and had the UNF bolt there so was all good.


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