BSA A7 or Huntmaster? Crankshaft Identification Help Needed
BSA A7 or Huntmaster? Crankshaft Identification Help Needed
Thanks again for any help, This is a Crank labelled as a BSA A7 500cc, its was included in my Huntmasters parts collection that I got included in sale and was thinking it fitted the Huntmaster as it is A10 based internally?
1958 FH Huntmaster
- simon.holyfield
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
Tricky to measure accurately, but if it's A7 it's 82 mm stroke and if it's A10/Huntmaster it's 84 (I think)!
As far as I know, most Huntmasters use the small bearing A10 crank; only the very last use the large bearing crank.
As far as I know, most Huntmasters use the small bearing A10 crank; only the very last use the large bearing crank.
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
By the shape of the webs and having the flywheel bolted on 'internally' with axial bolts I'd say that's not A10!
(Anyone thinking about a short-stroke 600cc Huntmaster maybe?? )
SG
(Anyone thinking about a short-stroke 600cc Huntmaster maybe?? )
SG
Web admin (webmaster@arielownersmcc.com)
'55 Huntmaster, '56 VH, ' 51 VH, '62 Arrow, '80 R100RT, '00 Sprint ST (now with a new Arrow project, and just now those 4-stroke Ariel parts can't even make one running bike...)
'55 Huntmaster, '56 VH, ' 51 VH, '62 Arrow, '80 R100RT, '00 Sprint ST (now with a new Arrow project, and just now those 4-stroke Ariel parts can't even make one running bike...)
- simon.holyfield
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
Certainly doesn't look like mine!Simon.Gardiner wrote: ↑Sat Apr 30, 2022 2:52 pm By the shape of the webs and having the flywheel bolted on 'internally' with axial bolts I'd say that's not A10!
(Anyone thinking about a short-stroke 600cc Huntmaster maybe?? )
SG
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
- robjameson
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
Doesn’t look right for huntmaster to me, so most likely what it says on the tin!
Rob Jameson
AOMCC Member Number 4068
1957 Ariel VH
1954 Ariel KH
1948 Ariel 4G with 1920's Ariel Sidecar/Triumph Chassis
AOMCC Twin Spares Organiser
AOMCC Member Number 4068
1957 Ariel VH
1954 Ariel KH
1948 Ariel 4G with 1920's Ariel Sidecar/Triumph Chassis
AOMCC Twin Spares Organiser
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
I think it's a small journal A7 or A10. If so the timing side journal will be 1.375"
and the big end 1.46".
I've seen these cranks both with and without the chamfer on the outer edge of
the web. Chamfered cranks will fit either Ariel or BSA and unchamfered cranks
only fit one but I can't remember which.
Big journal cranks - 1.687" - have the flywheel secured with three bolts going in
from the circumference - if I remember correctly.
and the big end 1.46".
I've seen these cranks both with and without the chamfer on the outer edge of
the web. Chamfered cranks will fit either Ariel or BSA and unchamfered cranks
only fit one but I can't remember which.
Big journal cranks - 1.687" - have the flywheel secured with three bolts going in
from the circumference - if I remember correctly.
- fpassmore
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
I agree A7, long stroke possibly, you need to measure stroke and journals then it becomes obvious. Sure looks the same as the one I just put in my ‘48 A7 LS.
Frank
Frank
'51 SQ4, '56 NH, '56 VH, '37 VH500 Red Hunter, '56 SQ4 (basket case), '49 Sq4 (basket case), '48 A7 BSA Twin, 12 other BSA's, 9 Norton's, 2 Triumph's, 3 Ducati's and 3 Japanese. Just crazed is all my problem is.
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Re: BSA A7 or Huntmaster? Crankshaft Identification Help Needed
That’s right Will!will_curry wrote: ↑Sat Apr 30, 2022 10:51 pm Big journal cranks - 1.687" - have the flywheel secured with three bolts going in
from the circumference - if I remember correctly.
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
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