Author Topic: Roller bush  (Read 1983 times)

Offline A10Boy

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Roller bush
« on: 25.05. 2010 21:13 »
After all the discussions here regarding timing side bushes, I wondered if anyone has seen one of these before??

http://cgi.ebay.co.uk/bsa-a7-a10-special-roller-bearing-replaces-timing-bush-/220610631591?cmd=ViewItem&pt=UK_Motorcycle_Parts&hash=item335d6b17a7

Regards

Andy

1958 Super Rocket
Plus
1974 Kawasaki Z1a
Yam XJR 1300

Online bsa-bill

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Re: Roller bush
« Reply #1 on: 25.05. 2010 21:45 »
Interesting
I'm wondering how effective the four bits are at keeping oil pressure compared to a one piece bush
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online muskrat

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Re: Roller bush
« Reply #2 on: 25.05. 2010 21:47 »
G'day Andy,
                      looks interesting. Would say the crank will need machining.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline shabashow

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Re: Roller bush
« Reply #3 on: 26.05. 2010 20:38 »
If that washer doesn't make a good seal, I would think the big ends will suffer from lack of oil. Just my tuppence worth,
John

Offline wilko

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Re: Roller bush
« Reply #4 on: 27.05. 2010 22:51 »
As long as the oil feed hole is in the bush area it shoudn't matter, but that caged needle i would replace with more needles!

Online RichardL

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Re: Roller bush
« Reply #5 on: 27.05. 2010 23:04 »
Why do I get the feeling that this obvioulsy used and experimental part is for sale on eBay because it came out of an engine with destoyed rod journals?
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Online bsa-bill

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Re: Roller bush
« Reply #6 on: 28.05. 2010 17:15 »
Yep -  it's not the kind of thing you buy two of to have a spare
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline shabashow

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Re: Roller bush
« Reply #7 on: 28.05. 2010 19:25 »
Ther's also the attendant risk that machining the timing side of the crank down to match the inner diameter of the bearing, it will be too weak, or else why would the recommended oversize plain bearing be only around +0.030?

Offline A10Boy

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Re: Roller bush
« Reply #8 on: 01.06. 2010 11:53 »
I dont think its a structural thing. Back in the day, BSA probably never dreamed that 50/60 years hence, old farts would still be wanting to ride these things around.
Regards

Andy

1958 Super Rocket
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1974 Kawasaki Z1a
Yam XJR 1300

Offline MikeN

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Re: Roller bush
« Reply #9 on: 01.06. 2010 13:52 »
Ther's also the attendant risk that machining the timing side of the crank down to match the inner diameter of the bearing, it will be too weak, or else why would the recommended oversize plain bearing be only around +0.030?

When SRM fit their crank roller conversion they have to grind the crank condiderably undersize to accept the new inner journal so its not a problem. Although this item doesnt look as clever as the SRM job.
Mike

Online RichardL

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Re: Roller bush
« Reply #10 on: 01.06. 2010 15:29 »
Andy,

I'd bet that in the late 40's and early 50's there were, indeed, old farts riding around on very early motorcycles just for the sake of enjoyment and as a hobby. Perhaps this would have been more common in the U.S., not having to recover from WWII any way near what was going on in Europe.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline A10Boy

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Re: Roller bush
« Reply #11 on: 02.06. 2010 10:34 »
Very true. I wonder if in 50 years people will still be riding fireblades and R1's for fun.
Regards

Andy

1958 Super Rocket
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1974 Kawasaki Z1a
Yam XJR 1300

Online muskrat

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Re: Roller bush
« Reply #12 on: 02.06. 2010 10:41 »
Ha, can you imagine being a show judge in 30 years trying to find an original R1. These days they are out of date before the warranty has expired.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7