The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Gearbox, Clutch, Primary => Topic started by: emilios on 18.03. 2010 19:18
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Hi
I just renew my crank spring on my plunger A10...the problem is that ive been given wrong spring(A10 swingarm)
What is the difference? lenght?
Will that be a problem?
Thanks
Emilios
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i dont believe there would be a problem, because bsa used the same engine internals on both the plunger and swing arm models. The only problem I can think of is the primary drive outer case is smaller on the plunger, if it fits then there shouldnt be a problem.
Perhaps someone who has a plunger and more experience than I could reply and help out.
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Why you need a new one, spring lost tension? I'm just about to take off the cush drive here, can measure the spring if you need a reference.
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I just wanted to replace it cause i bougth bike from England and i dont know what age is...
Yes please measure it for me..
Thanks
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Emilios,
I didn't see where anyone mentioned the part numbers for the two springs. Plunger 67-2062; swingarm 67-1136, according to my book.
Here are two links to the vintage-motorcycle.com site showing the two different parts. To me, it looks like a definate difference, with the 2062 a bit longer and made from partially flattened stock, while the 1136 is made from round stock. Now, does this make a difference in the way they work, I really don't know. Others here seem to think not but maybe they could explain further. I'm definately curious.
http://www.vintage-motorcycle.com/index.php?language=en&site=4&pid=11&id=4932&gesucht=true&suche=normal&suchstring=67-2062
http://www.vintage-motorcycle.com/index.php?language=en&site=4&pid=11&id=2768&gesucht=true&suche=normal&suchstring=67-1136
Richard L.
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My plunger had a spring just like 67-1136(shorter than the other) and the new one i but looks like 67-2062...
Looks like someone put the swingarm spring on my plunger
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spring (approx):
45mm high (this one may be slightly compressed due to age).
Outer dia 60mm, inner dia 44mm (material thickness 8mm).
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I could've sworn I posted here earlier, from the phone-just thought I'd check its progress....nevertheless....
I came across this post as a result of a i-net search for a replacement for....67-2062
If someone asked me why I need a new spring, I'd have to show...see attached piccie.(I hope)
For reference purposes this spring minus custom gap measures big enough ID to go over the sleeves, x 5/16" (8mm), x far as I can tell, 1,13/16 - 1,7/8" in length....
Plunger cush components look same as swingarm ones but in fact slightly physically different.
It's from the phone, so hope it works
Cheers, duTch.
ps - figured why it didn't happen earlier is the file was too big, accidentally changed the resolution *bash*
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For reference purposes this spring minus custom gap measures big enough ID to go over the sleeves, x 5/16" (8mm), x far as I can tell, 1,13/16 - 1,7/8" in length....
Plunger cush components look same as swingarm ones but in fact slightly physically different.
Update on previous post, figuring may as well keep the theme together.
Even though I asked for measurements when I ordered by phone, the replacement spring is vastly different to the original and measures,:-
0.303 wire *conf*, ID 1.752", Long/high, 1.704"
~7.7mm wire, " ID-43.3, long/high 44.5
(similar to a10gf, but slightly different but seems to work ok)
I feel is not long enough, and a sloppy fit diametrically (3.5mm),and apart from not seating well on the landings, could affect crank balance to a small degree.
What I meant with the measurements from previous post, was what I think the spring should in my opinion ideally be closer to, as below;
( wire- 5/16" ID-1.625 x 1,7/8" long,
in metric-
( wire- 8mm, ID- 41.5+mm, Length 47.5 mm.)
Reason I needed a replacement was I had a noise at kickover, that I knew was cush related, but was running fine, so wasn't too concerned till the gear changes were a bit crunchy, so figured the springs needed adjustment- again...... good thing I checked.
Hope that's of help to anyone, cheers