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1974 R90s /6 Trans Crank bolts weakness

The place to discuss the R 90 S as well as the R90S Worldnet archives!
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Dover Rider
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Joined: Sat Feb 13, 2021 11:52 pm
Location: Port Townsend WA
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1974 R90s /6 Trans Crank bolts weakness

Post by Dover Rider »

Hello All.
Looking for some guidance or assurance.(Mac, this might be right up your alley.)
I have owned a 74 R90/6 for 20 years with moderate riding and no real journeys.( Or problems for that matter). I am now retired and ready for some adventures. I recently acquired a 74 90s and hoping for some extended road time.

I've been reading about the smaller crank bolts and weak trans in 74 which BMW addressed in later models.
Is this a real concern for moderate riding (not track days). Or is it something that needs attention before venturing out ? Neither of these bikes are high mileage >50k.

I saw the list of 90s upgrades but would it be better to know "must do" from "nice to have" components? I like bullet proof stock best.
As always, thanks to all for such a great group.
Paul

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srankin
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Location: Spencerport, NY USA
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Re: 1974 R90s /6 Trans Crank bolts weakness

Post by srankin »

Keep the oils changed, things adjusted properly, and you should have no problems with what you have. St.
Owner of a 84, R80RT and 78, R100RS

Dover Rider
Posts: 61
Joined: Sat Feb 13, 2021 11:52 pm
Location: Port Townsend WA
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Re: 1974 R90s /6 Trans Crank bolts weakness

Post by Dover Rider »

Thank you. Sage advice....

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