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-   -   Shift linkage boss? (http://www.advrider.com/forums/showthread.php?t=853512)

DiabloADV 01-05-2013 11:42 PM

Shift linkage boss?
 
When did the airhead frames first get the boss to which the shifter linkage attaches? As opposed to the shifter that attaches directly to the shifter shaft on the gearbox...

I find pics of /5 and /6 bikes without it, and later bikes with it. But when did it first appear?

Rob Farmer 01-06-2013 12:29 AM

I'm not too sure but I thought it was 77/78 but a lot of bikes had it retrofitted because it improves the gear change so much.

carpetburn 01-06-2013 01:33 AM

correct- i fitted one to my/6

boxerboy81 01-06-2013 02:05 AM

It's easy enough to find pix of 1978 models with the direct gear lever, and even some 1979 ones. I'm guessing it's during the 1979 model run starting with the straight rod with the rubber bellows cover.

edit: Have a look at this 1978 brochure...

http://www.bmbikes.co.uk/photos/phot...07_1978_A1.jpg

rambozo 01-06-2013 10:08 AM

Both my 78 and 79 have the rubber bellow shifter as per that photo

Robs probably right with 77/78 year

CanadaBiker 01-06-2013 10:28 AM

Quote:

Originally Posted by Rob Farmer (Post 20407856)
I'm not too sure but I thought it was 77/78 but a lot of bikes had it retrofitted because it improves the gear change so much.

Does it really improve shifting that much?

I have a direct on my '77, but I haven't been able to put many miles on the bike since I got it. Although, my left foot feels a bit cramped on the peg and that the shifter doesn't stick out far enough to get my toe under it. But I wonder if changing to the linkage would improve that specific issue.

outfit 01-06-2013 11:02 AM

Quote:

Originally Posted by Rob Farmer (Post 20407856)
I'm not too sure but I thought it was 77/78 but a lot of bikes had it retrofitted because it improves the gear change so much.

I've retrofitted both my Mono and /7 to direct year's ago:thumb The gear linkage may well have been okay when new, but the sloppiness soon set's in. Anyway's I think it was just a publicity stunt by BMW in answer to press complaint's.:wink:

DiabloADV 01-06-2013 11:57 AM

My bike is a 74 90/6, and has the shifter boss. So I guess it was retro-fitted. How would somebody tell a /7 frame from a /6 frame?

supershaft 01-06-2013 12:28 PM

It had to of been late '78? I remember lots of our customers making the retro-switch. Lots of people said that it improved shifting quite a bit. I do too. Sloppy? The have replaceable bushings, bearings, and bolts. I have repaired quite a few of them and then they are like new again.

chollo9 01-06-2013 09:51 PM

Quote:

Originally Posted by DiabloADV (Post 20411617)
How would somebody tell a /7 frame from a /6 frame?

Serial number?


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