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Restoring the last of the series "A" Comets.


Robert Watson

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VOC Member
I think I have some old studs from my A rebuilds as I recall making all new ones. I am out right now but will try and remember this afternoon to have a look and see what is in the "A leftovers" bin!
 

Dinny

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VOC Member
Hi Greg,

Standard for the cylinder studs is 7/16 BSF, my crankcase threads were a mess and so I had some new studs made and the cases had inserts fitted.

The two covers should be the same Maroon as the tank I'm sure.

The gear spacer - you need two, they are steel and are fixed in place by a 4BA bolt (35 bike) as per the picture which is the original I have. I'm using this at the top and have had a spacer turned for the bottom one with a large OD so it has plenty of surface area.

Gearbox spacer.jpg

Hope this helps.

Mark
 

greg brillus

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VOC Member
Hi Mark, Thanks for that........Interesting the spacer I have is a casting in alloy........when I removed it, a small alloy peg fell out which was the small dowel that located in the hole in the left engine plate. I'm pretty sure that the case threads are 7/16 BSF as well..........Not as course as a whitworth thread, but I consider BSF threads to be an "Intermediate thread" anyway as far as thread forms go if you compare AN threads UNF verses UNC the BSF thread is sort of in between. I wasn't sure about the colour of the inspection covers, but maroon would look great..........I better tell my paint man before he turns them "Black"............Cheers and thanks for the replies.
 

greg brillus

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VOC Member
20180405_165507[1].jpg20180405_165507[1].jpgIf anyone wants/needs one of these let me know, I have four spares. The closer one is the original you can see where the small alloy pin has broken off, we increased this area and tapped the hole 2 BA thread, then new ones are alloy as well. Cheers...........Greg.
 

A_HRD

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VOC Member
Interesting, here is a 1935 original in solid steel - not scalloped out. Mega-heavy - as are the plates. I made my spacers - and plates too - in ally...
P1070834.JPG
Peter B
 

Andy B

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VOC Member
Just received the first repo chainguard back, looks really good, have left out the captive nut, if anyone else needs one let me know. Andy
 

Andy B

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VOC Member
Does anyone have any information on brake and clutch levers on the handlebars of a series A ie. make, type etc also type of decomp lever? Picture would be great??
 

greg brillus

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VOC Member
Hi Andy, The pre war levers seemed to be both Amal or Bowden levers, both very difficult to find now the amal ones had square head clamp screws, even more rare. Remember they are for one inch bars too...........I got on to the site called vintagereplica in Czechoslovakia, they have a great range of top quality levers and many other original style items that are hard to find, like the rear guard/stand clip assembly, Amal handlebar grips, John Bull footrest rubbers, even top quality headlight assemblies, though only in the Lucas pattern. The decomp lever had a small "s" bend in it, I'll send you a pic of the genuine one I found, they do come up on ebay from time to time. Cheers..................Greg.
 
Last edited:

John Oakes

Active Website User
VOC Member
Does anyone have any information on brake and clutch levers on the handlebars of a series A ie. make, type etc also type of decomp lever? Picture would be great??
Hi Greg

Here is a snap of my levers. Complete with square head screws. Fitted to 39 meteor

John
 

Attachments

greg brillus

Well Known and Active Website User
VOC Member
Hi John, Thanks for the pics.............You should try and get one of those excellent replica "Miller" diplite dip switches from Paul Horton who makes replica parts for Rudge motorcycles, they and many other parts he has suit the pre war HRD models and top quality and not too expensive. Look up rudgespares. Cheers........Greg.
 

MartynG

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VOC Member
Ok with regards to the two HRD cover/inspection plates that go over the clutch center and the magneto pinion drive.......should the background be black or the same burgundy/red as the top/bottom of the fuel tank..........? Also with the alloy oval spacers that go either side of the gearbox mounts, I have one original here which is 1/2 inch thickness, should the bottom one be the same. If so I am missing one and I will get some made. They will be made from solid alloy and I will drill/tap the small locator dowel using a short shank bolt arrangement rather than the original cast in dowel which is fragile, this original one is broken off. If anyone needs any let me know as I will probably make up a small batch of 10................Also are any of you in need of the cylinder hold down studs and long matching 3/8 CEI tube nuts to go with same, as I might get a small batch of these made soon as well................Can someone tell me what the lower thread that goes in the upper case is, is it 7/16 Whitworth..............Any help much appreciated...............Cheers........Greg.
It is DEFINITELY 7/16" BSF and the holes in the cases should be 1 3/16 " deep +- 1/16". PM on its way!

Martyn
 

greg brillus

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VOC Member
Can someone please advise on the shape/type of front guard stays for the later "A" Comets with steel guards, i note some of the restored bikes have alloy guards with stays similar to post war models. Do the later bikes have a tube type or flat bar with the rib pressed into its length and a separate one for each side. This Comet is coming together quite well now, cheers....................Greg.
 

vin998

Well Known and Active Website User
VOC Member
The front stays on the front mudguard should be made from just flat bar with no rib as far as I know. They were separate stays each side and did not curve around / over the mudguard. The lower rear stay on the front mudguard doubles up as a front stand when removing the front wheel. This was a curved pressing cross section on early bikes which later was tubular cross section of which I have seen at least two different versions. One version been of a similar design / construction to the rear stand.

Very early A's had similar flat stays at the lower rear of the front mudguard AND the lower front stand / stay, but by the beginning of 1936 that appears to have been dropped.

Simon
 

greg brillus

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VOC Member
Thanks John, On your lower stay/stand at the front where it bolts to the bottom of the forks, are they small machined castings that are brazed into the tube, or are the tubes just pressed flat and holes drilled through. Cheers...............Greg.
 

mercurycrest

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VOC Member
Thanks John, On your lower stay/stand at the front where it bolts to the bottom of the forks, are they small machined castings that are brazed into the tube, or are the tubes just pressed flat and holes drilled through. Cheers...............Greg.
They are castings brazed on the tube.
 

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