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hargis7556
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VBMWMO #7556
Joined: 06/07/2009
Posts: 20

Ok I am new so you guys take it easy on my lack of knowledge.

I do not think the gas tank on my bike is original nor is it the right period tank. It has the BMW Roundels glued to the tank. If I am correct these should be screwed on. How can I tell if the screw holes are there without taking the current decals off?

2 other questions; 1. How can I tell what the tank date is? the interior of the tank seems to be flaking does anyone knkow someone that can clean up and re-line or re-coat the tank?

Cheers
Bill from Virginia

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6844
1971 BMW R75/5 Gas Tank

Bill -

AFAIK the emblems beginning with the /5s were glued on. My /7 is glued on but my '69 R69S is screwed to the tank.

As for the tank, poke around this site:

http://www.bmbikes.co.uk/information.htm

and look at pictures of bikes and compare to yours.

You can reline a tank using products like POR-15 or KREEM. They come in a kit and there are multiple steps. Generally, though, these treatments will damage the exterior paint. I've read about people using grease or paraffin on the outside to help protect the paint.

Kurt in S.A.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

funkamongus
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Joined: 06/25/2009
Posts: 8
1971 BMW R75/5 Gas Tank

I recommend Caswells or POR 15, stay away from Kreem..

ebeeby
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VBMWMO #7133
Joined: 11/03/2006
Posts: 5
1971 BMW R75/5 Gas Tank

No, /5 roundels are attached with screws.

Most towns of any size have a shop that can acid clean your tank and line it for very little money.

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6844
1971 BMW R75/5 Gas Tank

"beeby7133" wrote:

No, /5 roundels are attached with screws.

Now that I look at some tanks closely, I can see the two screws on either side of the roundel. I hadn't notice that before. I guess that's a hold over from the /2 models.

Kurt in S.A.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

ebeeby
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VBMWMO #7133
Joined: 11/03/2006
Posts: 5
1971 BMW R75/5 Gas Tank

"schrader7032" wrote:
"beeby7133" wrote:

No, /5 roundels are attached with screws.

Now that I look at some tanks closely, I can see the two screws on either side of the roundel. I hadn't notice that before. I guess that's a hold over from the /2 models.

Kurt in S.A.

I had to deal with &^%#$ed up roundels that a PO had decided needed to be torqued to about 85ft/lbs. The key is easy easy easy with those screws to keep from breaking the enamel.

Anyway, that's how I came to know that all /5's have screws. BMW idiot proofed them for us after the /5.

But the roundel has a very long and varied history. There are guys who are experts on the manufacture date of the very numerous variety of BMW roundels. SOme are extremely rare and worth quite a bit of money. Naturally, none of the roundels *I* have are rare at all. Smile

R.D.Green
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Joined: 12/04/2008
Posts: 281
1971 BMW R75/5 Gas Tank

I think it was more cost-cutting than idiot-proofing after the /5 in some ways. No more enamel roundels, cast aluminum turn signals, chrome plated fender braces, etc. But, yes, you do need to be extra careful with those little roundel screws. And don't even think about trying to line up the slots either...

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