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JakeF
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VBMWMO #9236
Southern California
Joined: 12/02/2016
Posts: 75

In most photos of an R90S I see a gas cap that is raised and chromed. Mine (a very late serial number 1976) is neither. The patina on mine looks to be the same as the gas tank so it appears to be original but I don't know since the bike came with no history. I like the look of this cap and don't plan on changing it but wanted to see what forum users knew about it.

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JakeF
1956 R69, 1976 R90S, 2008 R1200GS

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6424
I thought this was the proper

I thought this was the proper gas cap for the larger tank, in anticipation of the /7 models. IIRC the late /6 and /7 tanks are the same.

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

JakeF
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VBMWMO #9236
Southern California
Joined: 12/02/2016
Posts: 75
The serial number of my bike

The serial number of my bike puts it in the last 200 produced. I wonder if that had anything to do with it?

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JakeF
1956 R69, 1976 R90S, 2008 R1200GS

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6424
Do you have a picture of the

Do you have a picture of the tank?

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

khittner
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VBMWMO #8223
Joined: 02/15/2012
Posts: 367
I don't know when/which frame

I don't know when/which frame numbers the switch was made to the flush-cap, /7 fuel tanks, but it's my understanding that, at some later point in the '76 model year production run, the fuel tanks were changed from the earlier, chromed, "flip-top" caps, to the screw-in flush-top style. My DO '76 R90S also had the flush-cap tank (and while I didn't have the full history of the bike when I bought it used, I had no reason to believe that the gas tank had ever been damaged and replaced with the later, /7-style tank), while my '75 R90S had the flip-top tank. Your screw-in gas cap looks to be the correct smooth semi-gloss/satin black finish; later and current replacements for that style of cap have a textured, flat black finish.

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Konrad

ksiemon
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VBMWMO #8470
Joined: 03/09/2013
Posts: 27
R90S / Airhead info

If you didn't know there are two books out there every Airhead owner should have. Both buy Ian Falloon. These will help with 99% of any questions you may have. Fuel caps, paint marks in bodywork, chrome hardware, mirrors. Ian is perplexed / confused about the faring holes......They were put there so you could pop out the headlight shell with the screw driver! The older airheads just had a fixed spring in the lower ring as you all know. Later ones had a screw at the front so the owner could loosen it, then it would almost just fall out. I had a "S" I purchased in July 75 and it had the holes. I got wrecked. My second one (still have it) was built in June 75 had no holes but the old ring. It's a pain in the ass to pop out.
Anyway these books are all over the internet..........

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skychs
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VBMWMO #9221
Joined: 11/25/2016
Posts: 245
manual

ksiemon wrote:

If you didn't know there are two books out there every Airhead owner should have. Both buy Ian Falloon. These will help with 99% of any questions you may have. Fuel caps, paint marks in bodywork, chrome hardware, mirrors. Ian is perplexed / confused about the faring holes......They were put there so you could pop out the headlight shell with the screw driver! The older airheads just had a fixed spring in the lower ring as you all know. Later ones had a screw at the front so the owner could loosen it, then it would almost just fall out. I had a "S" I purchased in July 75 and it had the holes. I got wrecked. My second one (still have it) was built in June 75 had no holes but the old ring. It's a pain in the ass to pop out.
Anyway these books are all over the internet..........

If I could get just one which one would you recommend? Just curious.

ksiemon
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VBMWMO #8470
Joined: 03/09/2013
Posts: 27
R90S Book

For you guys that are working on and have a 90S..... just get the BMW R90S one. It has everything you need and great pictures + all the info !

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