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Tank mount BSA A65 #781041 08/09/19 9:28 pm
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Chess Offline OP
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Hi Everyone.

I'm in the process of remounting my A65 Lightning after bringing it back from a 15 year slumber. But I bought it as a incomplete project so I'm missing some parts. Most of it I can understand what I need to get. But when it comes to the tank mounting system I'm a bit stumped. I look at the parts list but it seems strange that i need about 10 parts for it to mount?

Can anybody help me bring some clarity to this matter?

[Linked Image from draganfly.co.uk]

According to this picture I seem to need part 1-5 and part 20-24

Can that be right?

Thank you

Regars Chris

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Re: Tank mount BSA A65 [Re: Chess] #781042 08/09/19 9:51 pm
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Allan Gill Online Happy
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Yup. You need every bit.

If you omit part 22 then pressure on the rear drop piece (23) will separate it.

You could get away with buying parts 1, and 21-24, using a piece of tube and a coach bolt with 10mm or 3/8” square section.

If you need to make pipes up, I would do them differently than shown in the picture.


beerchug
Re: Tank mount BSA A65 [Re: Chess] #781044 08/09/19 10:25 pm
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gavin eisler Online Content
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Dont forget 15 and 18 , brace and rubber, doesnt mount the tank, stops it vibrating apart.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
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Re: Tank mount BSA A65 [Re: Chess] #781062 08/10/19 12:58 am
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Gordo in Comox Online Content
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The mounting is a pretty good system, the tank is completely isolated from the frame with rubber For sure you need either 15 or 34 depending on the tank you have, bolts 33 and the rubber 18 to go into 15/34. These keep the tank level from side to side. The two rubber cushions 14 and 31 take all the weight and level the tank from front to back and keep it from touching the frame.

The rest is what actually holds it down, You need 1-5 and 20-24 to make it all work although as mentioned above you can make some of those bits once you realize how it all works. That top stuff is designed to put just the right amount of tension on the rubber 24 to hold the tank tight without stressing it.

Gordo

PS: Here is a shot of some of the top bits. The chrome bit # 23 also holds down the ends of the chrome 'beading'. The tube shown is most likely not the right length but I included it for info. Missing is the rubber bit to go inside # 23 and the small washers. The nut shown is actually for a B44 VS tank but I think the plain nut shown in the A65 parts book is wrong as it is the same part number.

[Linked Image from i.postimg.cc]

Last edited by Gordo in Comox; 08/10/19 5:52 am. Reason: Photo added

The roadside repairs make for the best post ride stories.
Re: Tank mount BSA A65 [Re: Allan Gill] #781088 08/10/19 9:56 am
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Chess Offline OP
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Thank you all for your answers, now I'm a bit wiser. Looks like I'm going on a shopping spree on the old Intermeweb.

Originally Posted by Allan Gill
Yup. You need every bit.

If you omit part 22 then pressure on the rear drop piece (23) will separate it.

You could get away with buying parts 1, and 21-24, using a piece of tube and a coach bolt with 10mm or 3/8” square section.

If you need to make pipes up, I would do them differently than shown in the picture.


When you say pipes, are you talking about the petrol feed lines? I've been thinking about how to go about fixing these. Do you have any advises how to solve it?

Gavin: I have 15 and 18. But the cycle has been run without it for quite a bit, it has been used during the 70's and 80's as a race bike. Is there any risk of damage to the tank running without it?

Gordo: Thank you for your picture, it as I suspected, I need it all and will buy it. But I'm a bit confused over which tank I actually have!
[Linked Image from cdn.globalauctionplatform.com]

It looks a lot like this one but mine just looks a bit larger when I look at the proportions. On draganfly I look at the parts sheets but i cant find my tank, maby I have the wrong one for the bike?

Will upload a picture of my bike during the evning.

Regard
Christian

Re: Tank mount BSA A65 [Re: Chess] #781089 08/10/19 11:03 am
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"Gavin: I have 15 and 18. But the cycle has been run without it for quite a bit, it has been used during the 70's and 80's as a race bike. Is there any risk of damage to the tank running without it?"

Yes, it will vibrate apart, BSA fitted it for a good reason.


71 Devimead A65 750
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Re: Tank mount BSA A65 [Re: Chess] #781091 08/10/19 12:09 pm
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kommando Online Content
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Quote
It looks a lot like this one but mine just looks a bit larger when I look at the proportions.


The Tank in the photo was made in 3 sizes

2.5 gal with chromed sides for the A65 Firebird (ie the one in the photo)

3.25 gal tank for the B25 and B44 (but still with the scollops in the bottom for twin carbs so will fit an A65)

4 ish gal tank for the home market A65

[Linked Image from i182.photobucket.com]

[Linked Image from i182.photobucket.com]

Re: Tank mount BSA A65 [Re: Chess] #781096 08/10/19 1:47 pm
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Chess Offline OP
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[Linked Image from i.ibb.co]

This is the tank I have. It seems quite big.

Pardon my poor photoskills

Chris

Re: Tank mount BSA A65 [Re: Chess] #781097 08/10/19 1:48 pm
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Re: Tank mount BSA A65 [Re: Chess] #781104 08/10/19 3:48 pm
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Chess: I have no experience with that style tank but I would think the mounting is about the same for all the tanks. The variables would be the # 15 or 34 bottom bracket and the top 4 and 20 tube and bolt.

The parts page you posted above is of the 2 gal steel tank so those bits might not be correct. Do you have the parts book showing your tank and the fittings that go with it?

By the way what year is your bike? Is your tank actually a Firebird tank?

Gordo


The roadside repairs make for the best post ride stories.
Re: Tank mount BSA A65 [Re: Chess] #781108 08/10/19 4:53 pm
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Chess Offline OP
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I haven't found my type of tank anywhere so I have a sneaking suspicion that it's not the right tank for my bike.

My bike is a early 1970.

Re: Tank mount BSA A65 [Re: Chess] #781115 08/10/19 6:37 pm
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It looks like someone may have "customized" it. The hole for the central mounting bolt has been welded up. If there is no hole at the top, hmmm, custom.


1951 ZB GS
1953 BB GS
1953 Super Flash
1954 Vincent BS
1963 RGS
1956 Triumph T110

Re: Tank mount BSA A65 [Re: Chess] #781118 08/10/19 7:02 pm
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Chess Offline OP
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There is a big hole in the center of the tank, going thru the hole tank. It centers over the mounting bracket on the frame. But the tank has been welded in many places, the front lip is one place.

Re: Tank mount BSA A65 [Re: Chess] #781121 08/10/19 7:18 pm
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It appears to me this may mount much more like a fiberglass tank than the steel tank everyone is accustomed to. In the '70 parts book, take a look at plate 22. The tank pictured is nothing like any BSA tank, so ignore that. But, look at the mounting... that's all Firebird parts.

Re: Tank mount BSA A65 [Re: Chess] #781131 08/10/19 10:00 pm
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Chess Offline OP
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I'm sorry, I don't quite follow this. What is the " '70 parts book"?

Re: Tank mount BSA A65 [Re: Allan Gill] #781142 08/10/19 11:08 pm
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I struggled with this for years until I finally omitted part #22. There's no way that the chrome cup (#23) can correctly fit over the O-ring and trim pieces with #22 in there. I never could figure out what they were thinking there.

Originally Posted by Allan Gill
If you omit part 22 then pressure on the rear drop piece (23) will separate it.


Beg to differ. What keeps the chrome cup from being destroyed is having the correct length spacer (#4), correct shouldered nut (#2, but the one in the picture is not shouldered!). The round part of the shouldered nut fits through the rubber bushing (#24) and, when snugged down, makes contact with the end of the spacer (#4), while the washer (again, mine has a larger o.d.) pushes down against the rubber bushing. Thus it can only exert so much downward force on the chrome cup before the nut contacts the spacer. Of course the rubber bumpers (14 , 31) have to be the correct size as well.

With all this sorted, nothing has loosened or broken in a long time.

Oh, one more thing: The rubber bushing in the lower bracket must be snug and must be made out of firm rubber. This is a piece I made. It's been so long since I had the original bit (which got spongy and fell out some time in the '70s), I don't remember if it was up to grade.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Tank mount BSA A65 [Re: Chess] #781143 08/10/19 11:10 pm
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Originally Posted by Chess
My bike is a early 1970.

Originally Posted by Chess
I'm sorry, I don't quite follow this. What is the " '70 parts book"?


1970 A50/A65 Spares Manual

Re: Tank mount BSA A65 [Re: Chess] #781144 08/10/19 11:14 pm
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Ok, there have been a number of other posts since I started writing mine. Everything I wrote applies to a chrome tank like the one pictured in the original post (and like the one in my avatar). From the other photos posted, it looks like you may be dealing with a 1970 Spitfire fuel tank; that's why Mark B referred you to the "70 Parts Book". This would be the Factory Spares manual for 1970, available through most of the BSA parts suppliers (or probably online somewhere as well).


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Tank mount BSA A65 [Re: Chess] #781164 08/11/19 6:36 am
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Allan Gill Online Happy
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1970 spitfire????!!!! Queer as they stopped making theirs in 68.

The tank looks plenty wide enough to be the 4 gallon lightning tank. Although I’ve never heard of this 3.25 gallon tank that Kommando mentions? Sure that’s not just the American gallons against British gallons?

Mark, the ring... if your fortunate enough to have an original chrome centre piece then like my 2 gallon tank (NOS and didn’t come with one of those but had everything else) then it’s likely it won’t break, but the modern repop ones will, unless that’s mounted. The styling strips as before go above the rings then fit through the slotted holes. The flare of the lower part of the cup sits directly on the metal ring as opposed to forcing the rubber o ring and it’s making its own rest position..... just my experience of the same setup with and without that ring in place


beerchug
Re: Tank mount BSA A65 [Re: Chess] #781165 08/11/19 6:40 am
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Allan Gill Online Happy
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Chess: yes the fuel pipe, you could either use 180, 150 or 55 degree twin pipe banjos at the bottom of the carbs. The 55 degree will put all the pipes tucking inwards, the first two will put the pipes as your photo, this may or may not rub on your legs. Also note that the 180 banjo is for 1/4” bore pipe the latter two are for 5/16”


beerchug
Re: Tank mount BSA A65 [Re: Chess] #781169 08/11/19 8:53 am
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Quote
Although I’ve never heard of this 3.25 gallon tank that Kommando mentions? Sure that’s not just the American gallons against British gallons?


https://www.bsaunitsingles.com/Arch...70%20B44%20&%20B25%2000-4144%20x.pdf

UK only Shooting Start/Starfire 3.25 UK Gals for 69 and 70, US got a smaller tank at 2.5 UK/3 US gals which was an unchromed Firebird tank in 69 and a different tank for 70 based on an A10 small tank or similar.

Have 2 of these tanks, they are midway in size (width is the main change) between the A65 Firebird and the UK Lightning of same shape, its the red one in the pics I posted links to earlier.



Re: Tank mount BSA A65 [Re: Allan Gill] #781189 08/11/19 3:29 pm
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Originally Posted by Allan Gill
1970 spitfire????!!!! Queer as they stopped making theirs in 68.


Oops. I know I've seen a picture of an A65 with that ugly, oddly-shaped tank - I thought it was 1970, perhaps home market, perhaps fiberglass, where the U.S. version in the same year was a chrome tank.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Tank mount BSA A65 [Re: Chess] #781194 08/11/19 4:40 pm
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Chess: I have been trying to follow the off shoots of this thread.

It would seem to me that if your tank does not have seams along the top center then it would not have the chrome fitting or the chrome strips. The top bits shown on Plate 22 in the 70 manual posted above are very similar to those use for the B44 VS alloy tank. some are actually the same bits. The VS does not use a fitting at the top but instead has a shelf part way down the tunnel/ hole in the tank for the rubber doughnut to press against. The Chrome fitting is only used on the A65 tanks with the chrome strips and that do not have the ledge.

Does your tank have the ledge part way down the hole?

Here is what the VS tank bit look like. That is all that holds the tank on and it works very well.


[Linked Image from i.postimg.cc]

This is what an A65 tank looks like for the chrome fitting and chrome trim strips.


[Linked Image from i.postimg.cc]
Gordo

Last edited by Gordo in Comox; 08/12/19 12:30 am. Reason: Photo added

The roadside repairs make for the best post ride stories.
Re: Tank mount BSA A65 [Re: Chess] #782116 08/21/19 9:19 am
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Chess Offline OP
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It has the seam along it! But I don't own the chrome strip yet!

I'm looking for a replacement tank now that I know that I don't have a original motorcycle and are not bound by a style!

Has anybody a opinion about the Indian made tanks like this one Indian tank

Re: Tank mount BSA A65 [Re: Chess] #782124 08/21/19 11:53 am
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Allan Gill Online Happy
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Originally Posted by Chess
[Linked Image from i.ibb.co]

This is the tank I have. It seems quite big.

Pardon my poor photoskills

Chris

Originally Posted by Chess
It has the seam along it! But I don't own the chrome strip yet!

I'm looking for a replacement tank now that I know that I don't have a original motorcycle and are not bound by a style!

Has anybody a opinion about the Indian made tanks like this one Indian tank




I've not seen where you told us the year of bike, but this looks very much like a 70 lightning tank and its mounted to a 69/70 frame (looking at those fairing lugs on the headstock)


beerchug
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