Author Topic: What's This Part?  (Read 1382 times)

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Offline davis

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What's This Part?
« on: February 09, 2018, 01:40:31 PM »
From my collection of bushings these two odd ones popped up. Why the raised section? Looks like they were to mate with a groove in the driven sprocket. Just curious.

- Bob

Offline OldSwartout

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Re: What's This Part?
« Reply #1 on: February 09, 2018, 03:55:17 PM »
I believe they are the rear wheel drive dampers for a 350. There is a groove in the back of the sprocket to align the dampers.  P/N 7319-9000 (6 required).
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline davis

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Re: What's This Part?
« Reply #2 on: February 09, 2018, 07:35:33 PM »
Appreciate your response Karl, but all the other dampers I have and have seen do not have this raised part and all the driven sprockets I've seen are flat on both sides. These look like the were designed to fit into a circular groove on one side of the sprocket, thus why I am puzzled. Hate to pitch odd parts that may be actually unique ones useful to complete a set and mating sprocket from some sort of vintage.

Offline paul

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Re: What's This Part?
« Reply #3 on: February 10, 2018, 09:15:33 AM »
Are you sure theyre BS parts?

Offline OldSwartout

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Re: What's This Part?
« Reply #4 on: February 10, 2018, 11:00:30 AM »
Appreciate your response Karl, but all the other dampers I have and have seen do not have this raised part and all the driven sprockets I've seen are flat on both sides. These look like the were designed to fit into a circular groove on one side of the sprocket, thus why I am puzzled. Hate to pitch odd parts that may be actually unique ones useful to complete a set and mating sprocket from some sort of vintage.
  You're right, those aren't BS350 (see attached photo of 350 parts).  I know I've seen that exact setup with the groove in the back of the sprocket, but at this point I have no idea where.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline bsracer

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Re: What's This Part?
« Reply #5 on: February 10, 2018, 12:09:49 PM »
I believe they are for the 175's . I have both types, with and without raised section. I have plenty of sprockets with a groove. The flat ones work just as well.  I used the flat ones with sprockets I had made without the groove.


paul

Offline davis

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Re: What's This Part?
« Reply #6 on: February 10, 2018, 08:35:33 PM »
Upon closer inspection they are a little smaller - probably 175 but I could not see them on p.48 of the parts manual. I have two that look new, anybody want them? Need your shipping address. Thanks for the input.

- Bob

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Re: What's This Part?
« Reply #7 on: February 10, 2018, 09:24:23 PM »
Not sure what the belong to and not even sure they're Bridgestone, but they're not 175 dampers.  Here's what they look like.....
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline mqtsteve

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Re: What's This Part?
« Reply #8 on: February 11, 2018, 06:21:41 AM »
Moonpup,
Those looks like the BS90 dampers for the cushdrive rear hub (p/n 7319-3111).  Steve
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline OldSwartout

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Re: What's This Part?
« Reply #9 on: February 11, 2018, 08:03:56 AM »
Not sure what the belong to and not even sure they're Bridgestone, but they're not 175 dampers.  Here's what they look like.....
Those are the 175 dampers prior to S/N 16M, after that, the rear drive was changed to 6 separate dampers bolted to the back of the sprocket. That carried through to the 200, of course.  The manuals don't show the revised configuration, but the part numbers are listed in the parts catalog.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Online moonpup

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Re: What's This Part?
« Reply #10 on: February 11, 2018, 11:00:33 AM »
Not sure what the belong to and not even sure they're Bridgestone, but they're not 175 dampers.  Here's what they look like.....
Those are the 175 dampers prior to S/N 16M, after that, the rear drive was changed to 6 separate dampers bolted to the back of the sprocket. That carried through to the 200, of course.  The manuals don't show the revised configuration, but the part numbers are listed in the parts catalog.

Thanks Karl, I keep forgetting that the 175's had a bunch of "before/after" stuff.  :-[

Anyway, I found this rear sprocket on ebay for the SR 175's and it has the groove in the back. Maybe that's what these dampers are for?

https://www.ebay.com/itm/NOS-Bridgestone-Motorcycle-175-SR-RACER-Rear-Sprocket/252253592349?epid=1611835581&hash=item3abb7c5b1d:g:EvQAAMXQJRhRapnB&vxp=mtr
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline davis

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Re: What's This Part?
« Reply #11 on: February 11, 2018, 01:21:01 PM »
Good job, you guys nailed it!

Offline slawsonb

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Re: What's This Part?
« Reply #12 on: February 12, 2018, 11:46:34 AM »
BS archaeology! The most fun part of this obsession (imho)...
...bert

 


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