Author Topic: Primary case screw set for 1968 MklV Spitfire  (Read 364 times)

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Mickygee

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Primary case screw set for 1968 MklV Spitfire
« on: 12 June, 2024, 17:23:49 »
Hi about to order a new set of screws for the primary cover. My bike is a 1968, but is a hybrid originally manufactured in 1967, with the Y extension on the frame and engine number.

Do I order pre (BSF) or post (UNC) 1968 screw sets, as I believe they changed thread at this time ?

Thanks
1968 BSA A65 Spitfire IV hybrid

Mickygee

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #1 on: 14 June, 2024, 18:56:08 »
Or does it really matter as thread form so close ?
1968 BSA A65 Spitfire IV hybrid

cornishbob

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #2 on: 14 June, 2024, 20:46:40 »
i'd say NEVER mix-n-match NEVER EVER NEVER

DAVE BRADY

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #3 on: 14 June, 2024, 21:19:02 »
Hi,

Use the timing side screws as a guide.

Dave.

cornishbob

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #4 on: 14 June, 2024, 21:31:46 »
order one of each from ebay
check first to come. if they fit YIPPEEE. if they dont start a return 'not as described
the second one should fit if they dint start a return for them

if neither fit sell the bike and join a monestry

V500

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #5 on: 15 June, 2024, 09:24:04 »
Or does it really matter as thread form so close ?

BSF and UNC aren't remotely similar. 1/4 Whit and UNC are close though.

cornishbob

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #6 on: 15 June, 2024, 09:32:28 »
i learnt to my cost about whitworth and unc.
i used, because they were there, whitworth to fix a disc to an old front wheel before embarking on a long journey.
luckily i had a toolkit as the whitworths were rattling loose. that 5 degrees made all the difference to the fitment

Allan G

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Re: Primary case screw set for 1968 MklV Spitfire
« Reply #7 on: 16 June, 2024, 10:07:36 »
68 models still use bsc/BSF threads. Unified threads didnít start until 69.