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7 plate clutch conversion slips #586541
02/20/15 8:05 pm
02/20/15 8:05 pm
Joined: Dec 2006
Posts: 536
Folsom, CA
Y
yellow_cad Offline OP
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yellow_cad  Offline OP
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Joined: Dec 2006
Posts: 536
Folsom, CA
I installed an Aerco UK made 7 plate clutch conversion on my 70 T120R with the lighter (57-1560) springs. First time out, it slips pretty bad. Do I want to tighten up these lighter springs or convert back to the stock springs? I really would like the lightest lever pull I can get. There is a new top end on the bike so the oil is a break in type oil if this is a factor. Thanks for any help on this. Jim


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
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Re: 7 plate clutch conversion slips [Re: yellow_cad] #586542
02/20/15 8:15 pm
02/20/15 8:15 pm
Joined: Aug 2013
Posts: 495
Australia
D
downhere Offline
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downhere  Offline
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Joined: Aug 2013
Posts: 495
Australia
Is there clutch push rod clearance?

Re: 7 plate clutch conversion slips [Re: downhere] #586550
02/20/15 8:55 pm
02/20/15 8:55 pm
Joined: Dec 2006
Posts: 536
Folsom, CA
Y
yellow_cad Offline OP
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yellow_cad  Offline OP
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Joined: Dec 2006
Posts: 536
Folsom, CA
Originally Posted By downhere
Is there clutch push rod clearance?


Previous to installing the conversion, it had the stock clutch that worked just fine. I just wanted a little lighter lever pull. Is there anything about switching to the 7 discs that could cause a push rod clearance issue?


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
Re: 7 plate clutch conversion slips [Re: yellow_cad] #586615
02/21/15 7:43 am
02/21/15 7:43 am
Joined: Aug 2001
Posts: 7,590
scotland
triton thrasher Offline
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triton thrasher  Offline
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Joined: Aug 2001
Posts: 7,590
scotland
Originally Posted By yellow_cad
Is there anything about switching to the 7 discs that could cause a push rod clearance issue?


On any clutch, you have to check the clutch pushrod clearance and cable adjustment according to the manual and adjust if incorrect.

Don't bother trying to fix anything else until then.

Last edited by triton thrasher; 02/21/15 7:44 am.

Amateur Loctite enthusiast.
Re: 7 plate clutch conversion slips [Re: yellow_cad] #586619
02/21/15 8:18 am
02/21/15 8:18 am
Joined: Jan 2006
Posts: 1,989
Asheville, NC
Mike Baker Offline
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Mike Baker  Offline
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Posts: 1,989
Asheville, NC
It took a little while for the 7 plate kit in mine to settle down. It needed to be adjusted after each of the first 3 or 4 rides. After that it has been fine. I've got T140 springs in it.

Re: 7 plate clutch conversion slips [Re: Mike Baker] #586664
02/21/15 1:30 pm
02/21/15 1:30 pm
Joined: Dec 2006
Posts: 536
Folsom, CA
Y
yellow_cad Offline OP
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yellow_cad  Offline OP
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Posts: 536
Folsom, CA
Originally Posted By mblab
It took a little while for the 7 plate kit in mine to settle down. It needed to be adjusted after each of the first 3 or 4 rides. After that it has been fine. I've got T140 springs in it.


What exactly did you adjust after "the first 3 or 4 rides?"

If I understand correctly, the T140 springs are heavier than the stock 120 springs.

I wish John Healy would chime in on this as it is what he wrote that made me think that the 7 plate with the light springs was the way to go.


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
Re: 7 plate clutch conversion slips [Re: yellow_cad] #586669
02/21/15 1:48 pm
02/21/15 1:48 pm
Joined: Jul 2012
Posts: 1,686
UK Berks
A
AngloBike Offline
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Joined: Jul 2012
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UK Berks
I have a t140 running an lp williams 7 plate clutch along with an alloy pressure plate and venhill featherlight cable.
I run T120 springs on mine with no noticeable slop ( and my clutch doesn't stick like so many people in the USA)

Re: 7 plate clutch conversion slips [Re: yellow_cad] #586678
02/21/15 2:37 pm
02/21/15 2:37 pm
Joined: Feb 2008
Posts: 4,500
New Jersey USA
Tridentman Online content

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Tridentman  Online Content

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Joined: Feb 2008
Posts: 4,500
New Jersey USA
On my 74 T120RV I have the Hyde 7 plate clutch with T120 springs.
Works a treat with no slip and no graunching into first gear.
But of course you still have to set it up properly---makes sure pressure plate is lifting squarely and that the clutch push rod is adjusted correctly.
HTH

Re: 7 plate clutch conversion slips [Re: yellow_cad] #586682
02/21/15 2:53 pm
02/21/15 2:53 pm
Joined: Mar 2005
Posts: 10,219
Boston, Massachusetts
J
John Healy Offline

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Posts: 10,219
Boston, Massachusetts
Oil should always be considered a factor. When you say "break-in" oil what oil is it?

So is the clutch rod adjustment a factor to check.

Strange in that we have used Hyde's seven plate (both Aerco and Hyde's plates are made by Surflex using the same friction material) and 750 springs adjusted so the stud is just flush with the bottom of the driver slot in 750 twin motors approaching 75 hp with no slipping problems.


Re: 7 plate clutch conversion slips [Re: John Healy] #586728
02/21/15 6:39 pm
02/21/15 6:39 pm
Joined: Dec 2006
Posts: 536
Folsom, CA
Y
yellow_cad Offline OP
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yellow_cad  Offline OP
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Posts: 536
Folsom, CA
Originally Posted By John Healy
Oil should always be considered a factor. When you say "break-in" oil what oil is it?

So is the clutch rod adjustment a factor to check.

Strange in that we have used Hyde's seven plate (both Aerco and Hyde's plates are made by Surflex using the same friction material) and 750 springs adjusted so the stud is just flush with the bottom of the driver slot in 750 twin motors approaching 75 hp with no slipping problems.


Mine is a T120R with a new big bore kit (done at the same time as the clutch conversion). Are the 750 springs you mention, stronger than the 57-1560 springs I am using? If so, that's why I ask if I should just use the stock 120 springs. I do love the light pull that the light springs give me but if I'll never get away from slippage, I'll just have to take a little harder pull.


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
Re: 7 plate clutch conversion slips [Re: yellow_cad] #586730
02/21/15 7:04 pm
02/21/15 7:04 pm
Joined: Jan 2006
Posts: 1,989
Asheville, NC
Mike Baker Offline
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Mike Baker  Offline
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Posts: 1,989
Asheville, NC
The clutch never slipped, just the opposite. It wouldn't release.
It works good now, even 2 1/2 hours of track time last fall did not seem to faze it. It's adjusted so the stud is even with the top of the nut.

Re: 7 plate clutch conversion slips [Re: yellow_cad] #586758
02/21/15 9:00 pm
02/21/15 9:00 pm
Joined: Jan 2014
Posts: 2,176
South cone
R
reverb Offline
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Posts: 2,176
South cone
...I have these questions:

1-is this better than the original in a 79 for street/highway riding? or is better only in the track?
Originals have more friction material, thicker and are one less; the conversion seems good for the disengage and solve that they have less friction material by putting one more disc?
2-with the shared motor oil in a 79 T140 these thinner discs are better to disengage due to that?
3-if they are better than the original, I keep the springs in a 79 model or should I use the lighter of the T120s?
4-those aerco are the same as the Hydes? or the only thing the same is the material?

Thanks

Re: 7 plate clutch conversion slips [Re: yellow_cad] #586906
02/22/15 3:41 pm
02/22/15 3:41 pm
Joined: Dec 2006
Posts: 536
Folsom, CA
Y
yellow_cad Offline OP
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yellow_cad  Offline OP
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Joined: Dec 2006
Posts: 536
Folsom, CA
I guess the question that I'm not getting an answer to is whether or not those 57-1560 springs could be too light seeing how the motor is all fresh with a big bore kit and I might need to go back to the stock 120 springs and lose some of the easy lever pull. Any thoughts on that? Jim


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR

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