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How many A70s did BSA produce? #735522
05/16/18 11:26 am
05/16/18 11:26 am
Joined: Nov 2010
Posts: 3,033
Arlington, Massachusetts, USA
kurt fischer Offline OP

#irideslow
kurt fischer  Offline OP

#irideslow
Joined: Nov 2010
Posts: 3,033
Arlington, Massachusetts, USA
How many A70s did BSA produce, and when?

Just curious.

Thanks,


Kurt
1968-70-71 Triumph TR6R Bitsa - 1969 Triumph TR6R - 1971 BSA A65L - 1973 Triumph TR5T
2005 Ducati MTS 1000S DS - 2012 Ducati Hyper 796 - 2014 Kawasaki ZX1000
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Re: How many A70s did BSA produce? [Re: kurt fischer] #735526
05/16/18 12:23 pm
05/16/18 12:23 pm
Joined: Dec 2004
Posts: 9,430
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,430
Scotland
For production competition they had to produce minimum of 200 (like the 750 T120RT) so low 200's would be an educated guess, timing would be to meet the racing season.

Re: How many A70s did BSA produce? [Re: kurt fischer] #735530
05/16/18 1:20 pm
05/16/18 1:20 pm
Joined: Aug 2001
Posts: 3,984
argyll. scotland, uk
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 3,984
argyll. scotland, uk
Burtons have a page and register for A70s, they reckon around 200.
see here
https://burtonbikebits.net/bsaa70/


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: How many A70s did BSA produce? [Re: gavin eisler] #735560
05/16/18 5:50 pm
05/16/18 5:50 pm
Joined: Nov 2010
Posts: 3,033
Arlington, Massachusetts, USA
kurt fischer Offline OP

#irideslow
kurt fischer  Offline OP

#irideslow
Joined: Nov 2010
Posts: 3,033
Arlington, Massachusetts, USA
Excellent. Thanks to you both.


Kurt
1968-70-71 Triumph TR6R Bitsa - 1969 Triumph TR6R - 1971 BSA A65L - 1973 Triumph TR5T
2005 Ducati MTS 1000S DS - 2012 Ducati Hyper 796 - 2014 Kawasaki ZX1000
Re: How many A70s did BSA produce? [Re: kurt fischer] #735567
05/16/18 7:39 pm
05/16/18 7:39 pm
Joined: Jun 2013
Posts: 94
Texas, USA
R
Ray Elliott Offline
BritBike Forum member
Ray Elliott  Offline
BritBike Forum member
R
Joined: Jun 2013
Posts: 94
Texas, USA
I'll take one if you have the crank to put with it!


Ray Elliott
---
A65, A70, A75, T120, T140, T150, T160
Re: How many A70s did BSA produce? [Re: kurt fischer] #735574
05/16/18 8:51 pm
05/16/18 8:51 pm
Joined: Aug 2005
Posts: 1,444
melbourne florida
B
bodine031 Offline
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bodine031  Offline
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B
Joined: Aug 2005
Posts: 1,444
melbourne florida

Re: How many A70s did BSA produce? [Re: kurt fischer] #735581
05/16/18 9:33 pm
05/16/18 9:33 pm
Joined: Oct 2006
Posts: 2,721
Elburn, Ill. USA
I
Irish Swede Offline
BritBike Forum member
Irish Swede  Offline
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I
Joined: Oct 2006
Posts: 2,721
Elburn, Ill. USA
Sluggo, you are correct about the '66 and early '67 Triumph 650 flywheels. Triumph wanted the "high performance" image at that time and installed "chopped" flywheels to create quick-revving engines.
Problem was; they were "high-VIBRATION" engines as well.

The bikes would shake nuts off of bolts, make bolts disappear, shed parts, and crack sheet metal components.
Guys in my area would buy tubes of 3-M yellow weatherstrip cement to glue the nuts to the bolts. not unusual to a '66 Bonneville, with gobs of the stuff on all the fasteners. We called it "The Yellow Peril."

By late '67 or 1968 Triumph returned to heavier, smoother-running flywheels, with little loss of performance, and much more riding pleasure.

You found a way to use those lightened flywheels. Good for you!

Re: How many A70s did BSA produce? [Re: ] #735878
05/20/18 4:04 am
05/20/18 4:04 am
Joined: Oct 2001
Posts: 1,150
Sydney, Oz
S
Shane in Oz Online content
BritBike Forum member
Shane in Oz  Online Content
BritBike Forum member
S
Joined: Oct 2001
Posts: 1,150
Sydney, Oz
Originally Posted by Sluggo650PNW
Need a flywheel for one? I have some old warehouse NOS stock still in the wrapping, Some accounts have way more spares than bikes produced, I dont know for sure but several ex dealers told me that.

I could do with one of the flywheels.

It makes sense that BSA produced a lot of spares for the A70s.
  • they were intended for racing, so
  • - would have been rebuilt on a regular basis
  • - race teams tend to have at least 1 spare engine
  • some of the parts (e.g. pistons, main bearings & shims) were bought in, so BSA would need to buy a minimum order batch
  • the con. rods were also used on late A65s
  • the A70L was almost certainly intended as a production model for the 1973 model year, like the T140

Re: How many A70s did BSA produce? [Re: kurt fischer] #736123
05/21/18 10:35 pm
05/21/18 10:35 pm
Joined: Jan 2014
Posts: 3,877
Aus
N
NickL Online content
BritBike Forum member
NickL  Online Content
BritBike Forum member
N
Joined: Jan 2014
Posts: 3,877
Aus
There were loads of engines and parts about, some legitimate, some out of the back door, heaps of sidecar racers in the UK were using them.
Despite the A70 never being sold in the UK. The Birmingham Mafia was at it's height in the early '70's


Lamas are bigger than frogs.
No room for sanity here.
Re: How many A70s did BSA produce? [Re: kurt fischer] #736204
05/22/18 4:05 pm
05/22/18 4:05 pm
Joined: Dec 2003
Posts: 116
Pittsburgh,Pa.
R
Redd32 Offline
BritBike Forum member
Redd32  Offline
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R
Joined: Dec 2003
Posts: 116
Pittsburgh,Pa.
The A-70 timing side bushing is narrow compared to early A-65. Also it had a big hardened washer to control end play. The timing side engine case is spot faced for the narrow bushing and washer. I believe the A-70 crankshaft timing side journal might be narrow also.

Re: How many A70s did BSA produce? [Re: kurt fischer] #736349
05/23/18 8:47 pm
05/23/18 8:47 pm
Joined: Dec 2005
Posts: 556
Kansas City area
BritTwit Offline

BritBike Forum member
BritTwit  Offline

BritBike Forum member
Joined: Dec 2005
Posts: 556
Kansas City area
Of the 200 built, only 386 are known to still exist.

Re: How many A70s did BSA produce? [Re: kurt fischer] #736353
05/23/18 9:15 pm
05/23/18 9:15 pm
Joined: Jun 2013
Posts: 246
Georgia Mountains
G
goodtry Offline
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goodtry  Offline
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G
Joined: Jun 2013
Posts: 246
Georgia Mountains
I have one if someone wants to purchase!

Re: How many A70s did BSA produce? [Re: kurt fischer] #736361
05/23/18 10:12 pm
05/23/18 10:12 pm
Joined: Jan 2014
Posts: 3,877
Aus
N
NickL Online content
BritBike Forum member
NickL  Online Content
BritBike Forum member
N
Joined: Jan 2014
Posts: 3,877
Aus
Number 387?

That would be rarer than the 4800 RGS's that are about eh? or the 6000+ Thruxton bonney's


Lamas are bigger than frogs.
No room for sanity here.
Re: How many A70s did BSA produce? [Re: NickL] #736422
05/24/18 12:17 pm
05/24/18 12:17 pm
Joined: May 2013
Posts: 4,871
Rotherham - S. Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member
Joined: May 2013
Posts: 4,871
Rotherham - S. Yorkshire
Originally Posted by NickL
Number 387?

That would be rarer than the 4800 RGS's that are about eh? or the 6000+ Thruxton bonney's



Its a growing number Nick, the A70 still has another 10+ years of age before the official original bikes reach nearly 5000 grin


beerchug

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