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
Or does it really matter as thread form so close ?
i'd say NEVER mix-n-match NEVER EVER NEVER
Hi,
Use the timing side screws as a guide.
Dave.
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
Quote from: Mickygee on 14 Jun, 2024, 18:56
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.
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
68 models still use bsc/BSF threads. Unified threads didn't start until 69.