The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: 1660bob on 02.03. 2011 09:18

Title: lucas headlamp bolts, `61 SR
Post by: 1660bob on 02.03. 2011 09:18

Hi All. What size/thread are the two headlamp mounting bolts betwixt the headlamp brackets and shell on the non-nacelle type headlamps?
 The previous bodger of my bike has drilled them out and fitted M8 bolts/nuts-YUK! i would like to repair properly i.e. helecoil or make up threaded bosses to fit to the shell as its an original Lucas item and otherwise good. I can then get the proper chrome/stainless bolts to fit as per original thread, anyone know the thread type/dia?
(Poss.5/16" dia?-a 3/8" bolt will not fit into the drilled out holes left by the previous bodger) Cheers, Bob.

Title: Re: lucas headlamp bolts, `61 SR
Post by: Brian on 02.03. 2011 09:29

They are just about all 5/16" cycle thread (26tpi) and about 3/4" long.

Title: Re: lucas headlamp bolts, `61 SR
Post by: 1660bob on 02.03. 2011 17:21

Thanks Brian,time to get some cycle taps.......Bob.

Title: Re: lucas headlamp bolts, `61 SR
Post by: iansoady on 03.03. 2011 15:19

Tracy Tools (http://www.tracytools.com/) are very good.