Alan,
The two (two) bolts that hold the front cover on the air filter are 1/4 UNC
with a blackened finish. The 4 (four) bolts which mount the filters to the
carbs are 5/16 UNF.
I sent photos of my restored originals.
Cheers,
Curt
On Mon, Aug 17, 2009 at 7:07 PM, Alan Seigrist <healey.nut@gmail.com> wrote:
> All -
>
> Am refitting the original H4 carbs to my BN1 and am using the old Burgess
> Air Filters.
>
> The bolt that holds the front cover on teh air filter seems to be UNF...
> but
> strangely, I cannot seem to determine the thread for the two bolts which
> mount the filters to the carbs. These two bolts don't seem to be UNF,
> but maybe BSF? Can anyone confirm what thread these two bolts are? I
> really don't want to have to find out by cross threading them!
>
> Thanks,
>
> Alan
>
> '52 A90
> '53 BN1
> '64 BJ8
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