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Old 04-27-2010, 08:31 AM   #181
Lornce OP
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I kinda like the look of dual ATE's, just want a more traditional look for the bodywork. A return to the '74 R90/6 I rode when I was 21.

Guess I am become one of those old guy nostalgic vintage farts.

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Old 04-27-2010, 03:37 PM   #182
blaine.hale
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Quote:
Originally Posted by crazydrummerdude
Well, if you want to ditch the fairing and dual disc setup..

Shoot, put me in line for that dual disk set up
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Old 04-27-2010, 03:40 PM   #183
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Quote:
Originally Posted by blaine.hale
Shoot, put me in line for that dual disk set up
One time, I saw one on ebay goin' for like $20. It ended at like 7pm that night. At about 7:05, I checked, and it sold... for $20.

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Old 04-27-2010, 04:24 PM   #184
blaine.hale
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Quote:
Originally Posted by crazydrummerdude
One time, I saw one on ebay goin' for like $20. It ended at like 7pm that night. At about 7:05, I checked, and it sold... for $20.

You should go ahead and shoot yourself in the foot for not watching that auction.
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Old 04-27-2010, 04:58 PM   #185
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Quote:
Originally Posted by AntonLargiader
' sometimes the potentially deadly 10mm flywheel bolts (were never supposed to be used with 900cc but some got out),
So, what's the story on the "potentially deadly 10mm flywheel bolts"?
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Old 04-27-2010, 05:43 PM   #186
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Quote:
Originally Posted by Chobro
So, what's the story on the "potentially deadly 10mm flywheel bolts"?

I call it the "chicken little" syndrome
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Old 04-27-2010, 06:48 PM   #187
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It's a simple story...

After the introduction of the R-90 and the 90S there were reports of the small 10mm flywheel bolts that had been carried over from the R45/50/60/75 models shearing and creating quite a mess.

The problem disappeared after the factory discontinued using the small bolts and went with larger fasteners. I've never owned an R90 with 10mm bolts and while I'd sure want to know if a prospective bike had em, they wouldn't be a total deal breaker. I'd just have to consider how I was going to use the bike.

Some folks say that there were only a handful of R-90s issued with the 10mm fasteners but if thats true, how come it appears as if there are so many of em around?
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Old 04-27-2010, 07:42 PM   #188
Lornce OP
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Quote:
Originally Posted by wirewrkr

I call it the "chicken little" syndrome
Yeah, I ain't gonna worry too much about that one.

On another note... dropped in on a buddy this evening who has a 13mm perch mounted master cylinder and braided line on his '78 R100/7 (single ATE). Either his brake needed bleeding or I might be eating a little crow re. a 12mm M/C and twin ATE's.



Whatever it takes, baby. Whatever it takes.

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Old 04-27-2010, 07:45 PM   #189
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There were two versions of the 10mm bolts.
1970-1973 used short ones, 1974-late 1975 used a longer one.
In late 75 they changed the crank to 11mm bolts.

I've seen the 11mm bolts fail also.
If the 10s were so bad they would have had a lot more failures.
I believe the reason that BMW went to the 11mm bolts is not because of inherent failure of the 10s, but because they were getting ready to launch the new engine (1000cc) in 76 and redesigned a lot of things, some that were not necessary. (rubber diode mounts comes to mind)
They anticipated alot of things with the 1000 engine that were non issues.
(Smaller diameter alternator rotors because of crank flex also comes to mind)

the sky continues to fall.
small minds think alike.( it's easier)
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wirewrkr screwed with this post 04-28-2010 at 01:35 PM
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Old 04-27-2010, 09:39 PM   #190
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Thanks for the info, I'm just about ready to pull the flywheel on a 5/74(mfg. date) R90/6 to replace rear main, etc.

I'll let y'all know what I find...
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Old 04-27-2010, 09:50 PM   #191
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BTW, nice score!
Quote:
Originally Posted by Lornce

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Old 04-28-2010, 07:12 AM   #192
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Quote:
Originally Posted by Chobro
Thanks for the info, I'm just about ready to pull the flywheel on a 5/74(mfg. date) R90/6 to replace rear main, etc.

I'll let y'all know what I find...
Both of my /6's are early ones. Neither has 10mm flywheel bolts.
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Old 04-28-2010, 12:58 PM   #193
Max Headroom
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Quote:
Originally Posted by wirewrkr
There were two versions of the 10mm bolts.
1970-1973 used short ones, 1974-late 1975 used a longer one.
In late 75 they changed the crank to 12mm bolts.

I've seen the 12mm bolts fail also.
If the 10s were so bad they would have had a lot more failures.
I believe the reason that BMW went to the 12mm bolts is not because of inherent failure of the 10s, but because they were getting ready to launch the new engine (1000cc) in 76 and redesigned a lot of things, some that were not necessary. (rubber diode mounts comes to mind)
They anticipated alot of things with the 1000 engine that were non issues.
(Smaller diameter alternator rotors because of crank flex also comes to mind)

the sky continues to fall.
small minds think alike.( it's easier)

Just a minor but important correction: the later bolts are 11mm, not 12mm . . .
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Old 04-28-2010, 01:33 PM   #194
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Quote:
Originally Posted by Max Headroom
Just a minor but important correction: the later bolts are 11mm, not 12mm . . .
Thanks Max. I stand corrected. Don't know what I wuz thinkin.
But I still stand pat on the rest of the statement.
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Old 04-28-2010, 06:28 PM   #195
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Nice, I need to get mine back to a proper Monza Blue. Will probably end up painting myself though, I've never been happy with other peoples work.


Had a chance to check out Dave Percival's collection up in Maine once. Talk about pre /7 BMW heaven!
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