Author Topic: Incorrect cush drive spring?  (Read 726 times)

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Online newc10guy

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Incorrect cush drive spring?
« on: November 25, 2020, 09:18:08 pm »
I've been collecting parts for months, and now that i need them, some maybe aren't right.
I can't remember if this came from draganfly or not (for certain the sleeve and lobe parts did), but the spring looks too big in every dimension. It measures 2 3/8" free, and 2 1/4" o.d.
I would have expected the inner diameter to just fit the turned step on the lobed thing, but it's pretty sloppy.
I'll try to attach some photos
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)

Online newc10guy

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Re: Incorrect cush drive spring?
« Reply #1 on: November 25, 2020, 09:18:50 pm »
I have no idea how i could even get the nut started.
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)

Online Owen

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Re: Incorrect cush drive spring?
« Reply #2 on: November 26, 2020, 06:27:50 am »
Normally they are made from a square section. Have a search on cush as cush drive springs have come up before.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online timsdad

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Re: Incorrect cush drive spring?
« Reply #3 on: November 26, 2020, 07:34:03 am »
Yes, it's the wrong spring - as Owen says, it should be square section, but a pattern part would likely be round section. However, it should be a good enough fit to just about hold itself in place while you fudge about on the bench looking for the nut to nip it up with.

Unfortunately, like your Foreign mudguard and headlight, we only know what it's not and not exactly what it is. But that's still more than you knew!


Ray
Just a motorcyclist.

Online timsdad

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Re: Incorrect cush drive spring?
« Reply #4 on: November 26, 2020, 07:35:09 am »
Sorry, - wrong Yank!

Ray
Just a motorcyclist.

Online Owen

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Re: Incorrect cush drive spring?
« Reply #5 on: November 26, 2020, 10:09:14 am »
And happy Thanksgiving to you all over the other side of the pond.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online newc10guy

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Re: Incorrect cush drive spring?
« Reply #6 on: November 26, 2020, 12:38:12 pm »
And happy Thanksgiving to you all over the other side of the pond.
Thanks. It might be my favorite holiday.
Apart from all the 'black friday' nonsense, it's just food and people (usually).
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)

Online newc10guy

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Re: Incorrect cush drive spring?
« Reply #7 on: November 26, 2020, 03:44:58 pm »
This might be a question for Ron,
The same spring is used on the M series?
15-46 is what i found on the parts list.
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)

Offline johnintexas

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Re: Incorrect cush drive spring?
« Reply #8 on: November 26, 2020, 06:40:26 pm »
Sorry, - wrong Yank!

Ray
[/quote

That's all right no offence taken. 
Cheers
John in Texas
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Online MilitaryRon

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Re: Incorrect cush drive spring?
« Reply #9 on: November 26, 2020, 07:06:40 pm »
This might be a question for Ron,
The same spring is used on the M series?
15-46 is what i found on the parts list.

Yes but for some reason, Drags are getting all their springs made from round wire, instead of the original correct square section.  It's possible you have a (Empire Star) type clutch spring which From memory is bigger. I can check a clutch spring size tomorrow. Ron

Online newc10guy

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Re: Incorrect cush drive spring?
« Reply #10 on: November 26, 2020, 07:39:51 pm »
Thanks Ron.
I've found two, one used, one looks nos. Both are listed as "M" springs. Square profiles both.
Neither cheap, so i'm trying to avoid another mistake.
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)

Offline John M

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Re: Incorrect cush drive spring?
« Reply #11 on: November 26, 2020, 07:42:44 pm »
This chap has a few old stock springs on ebay ( with dimensions as he doesn't know which machines they are for ). Maybe one of them suitable if someone can check out dimensions ?

https://www.ebay.co.uk/sch/dynamodunn11/m.html?item=323976615983&hash=item4b6e82d82f%3Ag%3AgJIAAOSwnSJdyWbx&rt=nc&_trksid=p2047675.l2562

Online Owen

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Re: Incorrect cush drive spring?
« Reply #12 on: November 26, 2020, 09:20:08 pm »
Have a look at this recent post regarding the cushion Drive, I posted pictures and dimensions. 
https://bsac10c11c12.co.uk/smf/technical/high-compression-14101/msg126073/#msg126073
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online MilitaryRon

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Re: Incorrect cush drive spring?
« Reply #13 on: November 27, 2020, 01:26:06 pm »
Here are the Dimensions from the WD M20 standards book. Cush spring L. 1 5/8" OD. 2 7/32" ID. 1 5/8"   Clutch Spring  L. 2 3/8" OD. 2.325" ID. 1.760"

Ron

Online newc10guy

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Re: Incorrect cush drive spring?
« Reply #14 on: December 03, 2020, 04:51:10 pm »
Well, i won't get a chance to check this out until later today, but possibly i have the correct spring now.
I ended up buying a complete m20 (so i was told) shock absorber. It came with a square profile spring which looks promising.
'46 c11 (nearly resurrected)
'51 AJS 18 (next in line)
'74 TL125 (saved from the skip)