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Peter Quick
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#854744 07/27/21 6:23 am
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G'day All,
Can some one enlighten me on the thread form on Panther 350 Fork yokes? I am very familiar with all the British thread forms but some one has screwed UNF screws/bolts into the holes and made a hash of it. Before I going putting a BSF or BSCY tap into the holes to clean them up and with my luck I would pick the wrong one. Ken.

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ogrilp400 #854745 07/27/21 8:26 am
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Order the correct bolts and check the thread with a thread gauge, then buy and use the matching tap.

kommando #854749 07/27/21 11:29 am
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I have got all the bolts, and all the taps, But which ones? Ken.

ogrilp400 #854752 07/27/21 12:41 pm
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I am not familiar with Panther but on other marques the threads are often listed in the parts list.

I would doubt that the threads are Unified form.

John

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ogrilp400 #854753 07/27/21 12:46 pm
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Which forks? Dowry or Panthers own? More information please.

ogrilp400 #854754 07/27/21 12:47 pm
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Sorry, finger trouble. Dowty, not Dowry.

Villiers #854800 07/28/21 3:46 am
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Dowty forks they are Villiers.

ogrilp400 #854826 07/28/21 2:38 pm
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I looked through what I have on Dowty but as expected not a mention of thread type anywhere. Diameter yes. TPI, no.
Nevertheless, as Dowty were an aviation firm that initially made their name with internally sprung undercarriages and the Dowty Tele fork was their sole try at anything motorcycle I would expect them to use the taps and dies they already had in their factory so far more likely be BSF, not cycle thread.
I expect you can confirm this by measuring other threads on the forks. Nothing 1/4” of course as both 1/4” BSF and Cycle are 26tpi but what about the steering damper rod. From memory that is 5/16” so should be the same diameter as your problem butchered bolts.
Having said all that Dowty being aviation based can spring funny surprises on you as the aviation world sometimes liked to use non standard thread pitches to ensure only the right quality of fastener was fitted in sensitive areas. It pays to check very carefully.
Sorry I can’t do any better. I have careful instructions on care and maintenance but no actual advice on what thread form.


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