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Old 02-21-2011, 07:16 AM   #1
Xcuvator OP
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Airhead Vibration Cured

I have posted some questions here regarding my search for a crank for my 76 90S. The bike is one I restored a couple of years ago, but was never happy with the level of vibration in the foot pegs. One of the things I like about the 90 motors is they are almost as smooth as a 75, but this one vibrated as much or more than the 100s I've ridden.
So finally this winter I tore it back apart to find the crank was out of spec. So the search began for a replacement. I looked at five that for one reason or more felt weren't suitable. One of the most disappointing was from regular seller on IBMW, who turned out to be not only incompetent, but also dishonest.
So finally I just started emailing people I had had contact with, who might have a lead on one. One such email went to our own Robert the Wirewerker. He said he had one but he would need to take it out and measure it. Measure it? This was something I had not heard from a seller before. So a couple of days later I hear back that it checks out to be very good. By this time I felt like UH HUH, we'll see. But a few days later
Robert had the crank at my door and to my pleasant surprise I found the rod throws at the upper end of the spec, the mains fell into one of the color codes and they were all very round.
Yesterday I took the bike out for a test run and found it to be a very smoooth running R90S. Up until then my 74 90S was the smoothest airhead I have ridden, now I'm not so sure.
Oh, and many thanks to BMW Wrench for all the fitment clearance tips.

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Old 02-21-2011, 07:28 AM   #2
Uncle Ernie
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Wow- the red paint really faded bad, didn't it.
Now that it runs good, a quick re-spray and you'll be proud to go out in public again!

Mazel tov ! >clink<
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Old 02-21-2011, 07:42 AM   #3
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Originally Posted by Uncle Ernie View Post
Wow- the red paint really faded bad, didn't it.
Now that it runs good, a quick re-spray and you'll be proud to go out in public again!

Mazel tov ! >clink<
My cheap Kodak makes my red bike look terrible. My good camera blew out of my not zippered tank bag, sorry for the distress.
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Old 02-21-2011, 09:45 AM   #4
Wirespokes
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That's good news dude! So that's why I haven't seen you in forever, right?
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Old 02-21-2011, 12:17 PM   #5
fishkens
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Nice!

Do you have pics of the rebuild that you can post?
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Old 02-21-2011, 02:11 PM   #6
Hawk Medicine
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Glad you got your bike back together and running right!

Having sold my share of parts on IBMR and Ebay, I find it astounding how few people ask questions, before shelling out money for used parts. There are also a few things that I wouldn't sell without having someone knowledgeable look em over and a crank is one of them. I can just imagine sending someone a used crank and then having it fail after the buyer completed an expensive rebuild. I wouldn't be able to sleep for a month!

The other side of the coin is that there are some real asshole buyers out there but thats a different story!

I think you're pretty lucky to have hooked up with Wireworker. Hes one of the more knowledgeable guys around here, when it comes to parts and the items that I've gotten from him have always been better than I expected and cheaper than I would have otherwise paid.

Sounds like a good deal all around. Now... Go ride your bike!
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Old 02-21-2011, 02:23 PM   #7
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Nice!

Do you have pics of the rebuild that you can post?
No I didn't take any, didn't think there would be much interest and on top of that, like I said my camera leaves alot to be desired, especially on indoor pictures. I have been punishing myself for loosing a fairly good one.
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Old 02-21-2011, 02:24 PM   #8
Caddy82rats
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interesting I haven't imagine that a crank can act like that for vibration.
and good looking bike
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Old 02-21-2011, 03:56 PM   #9
Wirespokes
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Quote:
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...and good looking bike
Believe me, it's stunning in person!
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Old 02-21-2011, 06:23 PM   #10
RecycledRS
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Just for future reference, what was wrong with the crank?
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