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SRM Clutch Upgrades #384976
07/18/11 3:23 am
07/18/11 3:23 am
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Back2Brits Offline OP
BritBike Forum member
Back2Brits  Offline OP
BritBike Forum member
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Hi All,

Doing a clutch "freshening" on my '69 Lightning as I (OK, I have help on the transmission, so it's "we") chase down a case of popping out of gear when hot & under acelleration load. And no, I don't expect a clutch to fix that problem. It's more a case of, "well, while we're here, lets do this, too."

I picked up an SRM Pressure Plate recently. Now I'm wondering about the friction plates themselves. I have three ways to go:
1. wet-sand & reuse the originals (10,000 miles on 'em, still good)
2. replace with a set made by Barnett ($75, +/-)
3. replace with the SRM multiplate disc kit ($143 plus shipping from Blighty at, what, $30?)

SRM recommends their kit - surprise! Any word on the Barnett product? Any wisdom on mixing the makers on the components?

Just wondering how best to maximize the dollars to get the best bang for the buck. Any advice or experience is appreciateed.

- Conrad


Back2Brits
1969 A-65 Lightning

"Ride....? On THAT?" asked my wife. Which is why I ride solo.
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Re: SRM Clutch Upgrades [Re: Back2Brits] #384989
07/18/11 10:06 am
07/18/11 10:06 am
Joined: May 2004
Posts: 3,674
Sydney Australia
B
BSA_WM20 Online content
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BSA_WM20  Online Content
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B
Joined: May 2004
Posts: 3,674
Sydney Australia
Depends upon how good your plates are.
If your clutch was not slipping before then don't fix what isn't broke.
IF it was then do a quick deglaze with some fine wet & dry.
If the whole clutch is now a little thin then add another plain plate to make up the thickness.
Barnets have a really good name but I have never used them so I can not evaluate.


Bike Beesa
Trevor
Re: SRM Clutch Upgrades [Re: BSA_WM20] #384992
07/18/11 10:43 am
07/18/11 10:43 am
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
D
DickDastardly Offline
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DickDastardly  Offline
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D
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
Originally Posted By: BSA_WM20

If the whole clutch is now a little thin then add another plain plate to make up the thickness.


Hmmmm! When I first got my Thunderbolt in 1978 the guy that owned it before had done this frown

The clutch dragged at slow speeds and slipped at higher speeds, as I was 'green' then I didn't know how many plates should be there and just thought I wasn't adjusting it properly blush

But when I 'coffed' out for a manuual and seen that the clutch had been bodged, this explaned why the cluch centre also kept "coming apart" and stripping theads.

My advice for what it's worth, is to dig deep buy the right parts from a decent supplier, (one that you can go back to if it's not right)it'll work out cheaper in the end and with less hassle.

As far as Barnet goes, I wouldn't fit one in my Harley there has been problems with wear, mentioned on the Harley forums in the UK, but they may be OK for the BSA 2c




Re: SRM Clutch Upgrades [Re: DickDastardly] #385014
07/18/11 12:50 pm
07/18/11 12:50 pm
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Back2Brits Offline OP
BritBike Forum member
Back2Brits  Offline OP
BritBike Forum member
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Thank you Devon & Dick Dastardly. I appreciate the info. Buying the top $ part is usually what I do, as that's the only way to assure quality these days. This in turn produces an argument with the "Minister of Finance". Ah, true love....

The pressure plate was purchased to help solve some clutch dragging when the Lightning is warm. Adjusting the clutch as the engine reaches temperature isn't always the safest practice in modern traffic. I need a "set it and get on with it" solution.

I'm curious to see if the quality levels of the SRM clutch pack matches the reputation, and the price. SRM has had a few problems over the years with a variety of its products. All seem to have been solved. But....

Anybody else?


Back2Brits
1969 A-65 Lightning

"Ride....? On THAT?" asked my wife. Which is why I ride solo.
Re: SRM Clutch Upgrades [Re: Back2Brits] #385100
07/18/11 10:25 pm
07/18/11 10:25 pm
Joined: Apr 2005
Posts: 1,634
Mississauga, Ontario.
A
Adam M. Offline
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Adam M.  Offline
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A
Joined: Apr 2005
Posts: 1,634
Mississauga, Ontario.
I was looking for the best bang for a buck too, so decided not to buy SRM plate. My clutch was dragging and nearly impossible to engage.
What I did was conversion to older BSA system ( my BSA is 70 with Triumph ramps and balls ) - you already have it.
I bought a new cable and carefully set up original pressure plate to be completely parallel to the rest of the plates when engaged.
I set up and locktited central clutch adjuster screw to have plates really loose when a clutch is engaged.
Result - light and faultlessly working clutch with minimal investment smile

Re: SRM Clutch Upgrades [Re: Back2Brits] #385124
07/19/11 1:13 am
07/19/11 1:13 am
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Back2Brits Offline OP
BritBike Forum member
Back2Brits  Offline OP
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Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Thanks, Adam. I have an NOS BSA clutch cable, all ready to go. As for making sure everything's parallel, well, it'll be fun working with those 3 little screws and the funky tool.

Between this and a thread I just found from July 10, I think I'm set. That is, until something goes hopelessly wrong.....

Nah. Never happens.

Cheers,
Conrad


Back2Brits
1969 A-65 Lightning

"Ride....? On THAT?" asked my wife. Which is why I ride solo.
Re: SRM Clutch Upgrades [Re: Back2Brits] #385139
07/19/11 2:59 am
07/19/11 2:59 am
Joined: Feb 2007
Posts: 2,214
Atlanta, GA USA
S
Semper Gumby Offline
BritBike Forum member
Semper Gumby  Offline
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S
Joined: Feb 2007
Posts: 2,214
Atlanta, GA USA
I have used a Barnett clutch plates in two bikes - a Honda 400F and the Firebird. In both cases I have found the same thing happening. The plates must be thicker than stock because it seems I can't completely disengage the clutch with the handle pinned to the bar.

Love the cables, don't much like the plates.

Remember to score up the metal plates as well. Concrete floors are pretty good flat surfaces for this job.


Gaggle of BSAs
a Honda
an old BMW
and a Montesa
Parking lot Elf in training
Re: SRM Clutch Upgrades [Re: Back2Brits] #385170
07/19/11 11:20 am
07/19/11 11:20 am
Joined: Aug 2001
Posts: 5,022
Stone Creek OH USA
R
Rich B Offline

BritBike Forum member
Rich B  Offline

BritBike Forum member
R
Joined: Aug 2001
Posts: 5,022
Stone Creek OH USA
IME, best clutch pack for the money, is from MAP Cycle in St Petersburg FL. I recently had my Lightning clutch out due to a primary chain replacement, at 30k miles, the MAP clutch looks like new. grin I like that. Still works a treat too.

IME, the Barnett clutches are miserable beasts, drag when warm, stick after sitting....just not worth it IMO.


Life is too short to drink cheap, bad beer.
Re: SRM Clutch Upgrades [Re: Back2Brits] #385207
07/19/11 4:24 pm
07/19/11 4:24 pm
Joined: May 2005
Posts: 3,804
ohio
shel Offline
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shel  Offline
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Joined: May 2005
Posts: 3,804
ohio
I have the MAP plates too. No sticking, no dragging and neutral is easy to find even when sitting still.
I have a very low mileage set of Barnett plates in a box around here somewhere.
I do like Barnett cables though.


When given the choice between two evils I picked the one I haven't tried before
Re: SRM Clutch Upgrades [Re: Back2Brits] #385209
07/19/11 4:32 pm
07/19/11 4:32 pm
Joined: Jul 2001
Posts: 12,618
Central Virginia
Lannis Offline

Life member
Lannis  Offline

Life member
Joined: Jul 2001
Posts: 12,618
Central Virginia
Originally Posted By: Back2Brits
Hi All,

Doing a clutch "freshening" on my '69 Lightning as I (OK, I have help on the transmission, so it's "we") chase down a case of popping out of gear when hot & under acelleration load. And no, I don't expect a clutch to fix that problem. It's more a case of, "well, while we're here, lets do this, too."

I picked up an SRM Pressure Plate recently. Now I'm wondering about the friction plates themselves. I have three ways to go:
1. wet-sand & reuse the originals (10,000 miles on 'em, still good)
2. replace with a set made by Barnett ($75, +/-)
3. replace with the SRM multiplate disc kit ($143 plus shipping from Blighty at, what, $30?)

SRM recommends their kit - surprise! Any word on the Barnett product? Any wisdom on mixing the makers on the components?

Just wondering how best to maximize the dollars to get the best bang for the buck. Any advice or experience is appreciateed.

- Conrad


I used Barnett clutch plates; they worked well. Never any sticking, never any slipping, always a clean release.

However, after about 20,000 miles of hard use, they were pretty ragged looking, so I replaced them with whatever brand of replacement plates that Baxter's sells, and I'm trying them.

I also switched from ATF back to 30-weight oil in the primary, just to see. I still like the clutch action, no sticking, no slipping, so maybe the lube doesn't make that big a difference. I'm riding the bike regularly, and will put another 1000 miles on it on the OVBSAOC trip in a few weeks, so we'll see how they go .... !

Lannis


You can ignore reality but you can't ignore the consequences of ignoring reality.
Re: SRM Clutch Upgrades [Re: Lannis] #385260
07/19/11 7:53 pm
07/19/11 7:53 pm
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Back2Brits Offline OP
BritBike Forum member
Back2Brits  Offline OP
BritBike Forum member
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Thanks, Lannis. Can't find anything about the Baxter stuff on their site. I'll have to call them and find out more.

I hadn't considered MAP, but then, I've never used them either. But their kit sure looks interesting. I'm tempted...

I think I'm with you, Lannis, on the primary chain oil. My '69 book says to use clean engine oil. So, straight 30 weight or engine oil or ATF fluid all seem to work about equally as well from what I've seen on other posts. It seems to me that something just has to be there.


Back2Brits
1969 A-65 Lightning

"Ride....? On THAT?" asked my wife. Which is why I ride solo.
Re: SRM Clutch Upgrades [Re: Back2Brits] #385262
07/19/11 8:00 pm
07/19/11 8:00 pm
Joined: Aug 2001
Posts: 5,022
Stone Creek OH USA
R
Rich B Offline

BritBike Forum member
Rich B  Offline

BritBike Forum member
R
Joined: Aug 2001
Posts: 5,022
Stone Creek OH USA
Engine oil was state of the art when your bike was new.

Honda sells a red oil that has the consistency of ATF but it is spec'd for the transmissions and clutches of the CR off road bikes. Works wonderful. bigt


Life is too short to drink cheap, bad beer.
Re: SRM Clutch Upgrades [Re: Back2Brits] #385379
07/20/11 1:39 pm
07/20/11 1:39 pm
Joined: Aug 2001
Posts: 3,881
Cape Carteret, NC
M
Mr Mike Offline
BritBike Forum member
Mr Mike  Offline
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M
Joined: Aug 2001
Posts: 3,881
Cape Carteret, NC
MY luck with Barnett plates is that they stick after sitting for a period of time. Maybe the new ones won't stick, but i changed mine to get rid of the sticking. On the dragging issue: My A65 dragged when the engine was hot. I tried everything to get it to quit and nothing worked. Finally I changed clutch levers...not to fix the dragging but to add morror perches. I used Triumph levers. I noticed that the Triumph levers has a longer distance between the pivot point and the center of the cable attachment point. This means that there is more"throw" on the clutch or that it will move the pressure plate a greater distance. It also made the clutch lever harder to pull, but it Immediately and permanently solved my clutch dragging problem. I use motor oil in all my clutches.

Mr Mike

Re: SRM Clutch Upgrades [Re: Mr Mike] #385404
07/20/11 4:59 pm
07/20/11 4:59 pm
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
D
DickDastardly Offline
BritBike Forum member
DickDastardly  Offline
BritBike Forum member
D
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
Ah, a thread that degenerates into oil talk, my favourite crazy

Well for my two-penneth worth (the English version of 2 cents) I have used this, as the manual says use 'Castrolite' so here it is!

Holden Vintage and Classic



Regards

Last edited by DickDastardly; 07/20/11 5:09 pm.



Re: SRM Clutch Upgrades [Re: DickDastardly] #385637
07/22/11 1:01 am
07/22/11 1:01 am
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Back2Brits Offline OP
BritBike Forum member
Back2Brits  Offline OP
BritBike Forum member
Joined: Jan 2011
Posts: 54
Philadelphia, PA USA
Castrolite! Wow, haven't given it a thought since I last saw a friend's MGTD. Perfect solution though. A bit dear in England. Almost impossible to find here in the USA. Almost....

Anyway, waxing on about oil (groan) is tangential. I ordered the MAP clutch kit, based mostly on what I saw here.

Now, what to do with the SRM Pressure Plate.... the guy at MAP talked it down, no surprise. But I'm still of a mind to use it with the new plates.

Any thoughts about combining the two? Will I end up with Robo-clutch, or Franken-bike?

BTW - I found a set of Triumph levers in really good shape from a T150. Dead ringers for what was on my Lightning, except for the cable adjusters. Those suckers just look like they'll work far better than my tired old 4 point star adjusters. Has anyone else tried to use those long, threaded Triumph cable adjusters on their otherwise orignal patterned BSA cables? Any advice or warning of pitfalls is greatly appreciated.

Cheers,
Conrad


Back2Brits
1969 A-65 Lightning

"Ride....? On THAT?" asked my wife. Which is why I ride solo.

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