Print Page - a65 cylinder barrel nuts

Title: a65 cylinder barrel nuts
Post by: Ralphy2 on 18 Jul, 2026, 11:51

What's the general opinion on fitting washers under the cylinder barrel nuts on an A65, as far as I know they were not fitted when new? cheers, Ralphy

Title: Re: a65 cylinder barrel nuts
Post by: V500 on 18 Jul, 2026, 13:12

Good engineering to fit washers on any head, but particularly on alloy heads to prevent distortion around the nut seating.

Title: Re: a65 cylinder barrel nuts
Post by: DAVE BRADY on 18 Jul, 2026, 17:29

Hi,

Definitely washers. They help to protect paint and look more finished than just a nut.

Dave.

Title: Re: a65 cylinder barrel nuts
Post by: Ralphy2 on 19 Jul, 2026, 15:14

Thanks for the input guys, but am I right that there were none fitted when new? barrels to crankcase nuts is what I mean. cheers, Ralphy

Title: Re: a65 cylinder barrel nuts
Post by: DMadigan on 20 Jul, 2026, 21:56

In '71 the nuts were changed to a washer base type. Still. better to use a washer as turning the nut against paint will change the torque depending upon the hardness and thickness of the paint.

BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: Ralphy2 on 18 Jul, 2026, 11:51