Source for 13mm front master cylinder seals

J

JimNH

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Jan 4, 2014
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My front MC was sleeved to 13 mm some years ago and has just started leaking. Shop was in CT and sadly closed due health issues so I don't know the origin of the kit/parts used. Does most everyone who sleeved them us the same internals? If so, got a source?

Thanks!
 
Oh boy, the pictures of RGM and AN pistons are different.

Anyone know what the Clubman Racing exchange units used? I miss Frank.
 
Looking back at some old threads, it seems they used RGM kits. There is a picture of one here..

L.A.B.

Post in thread 'Master cylinder identification?'

Commando75 said:
when you look into the bore the first half inch or so appears to be threaded. The one on my bike has a completly smooth bore. Can anyone tell me what those threads are all about?
Click to expand...

Sounds as if it has been threaded for the 13mm reducing sleeve? (photo is RGM Motors 13mm sleeve kit)
Master cylinder identification?

If you have the plunger piece (for want of a better word) shown to the left of the rubber boot, that would confirm it.
 
Last edited:
In my MC the piston is retained by a block secured by two 3/32" allen/grub screws. The block seems to be attached to a metal retainer that's in a groove machined in the barrel. There's no dust boot. I'm trying to have the new parts in hand before disassembling it.
 
Found a YouTube video of Fair Spares New England installing the kit in my MC. I'm actually in New England so it's probably all going to work out.

Thanks all.
 
Looking at the video it looks like o rings, not cups, so I should be able to measure it up and get an EDPM from McMaster Carr. Anyone done it and have the dash number?
 
JimNH said:
Looking at the video it looks like o rings, not cups, so I should be able to measure it up and get an EDPM from McMaster Carr. Anyone done it and have the dash number?
Click to expand...
I don’t like to criticize, but that has to be one of the worst instructional videos I’ve ever seen.

Anyway, I’m sure Fair Spares can advise on replacement seals. I’d be very, very surprised if it’s just o-rings on the piston though.
 
cliffa said:
I don’t like to criticize, but that has to be one of the worst instructional videos I’ve ever seen.

Anyway, I’m sure Fair Spares can advise on replacement seals. I’d be very, very surprised if it’s just o-rings on the piston though.
Click to expand...
Yeah, on closer look it’s probably a cup on the end and o ring on the piston.
 
@JimNH you may want to read this thread ( well the beginning anyway)

mean gene

Thread '13 mm Front disc kit (2020)'

New to this forum but have owned Nortons for 8 years. My 74 850's front disc master cylinder stuck in when pulled on lever. "Time for rebuild" When I disassembled it ,it had a 13mm sleeve and serial number etched on it . Called Al Miles and it was one of his rebuilds. He wanted $265 to rebuild it!! I told him it was perfect on outside and didn't need powder coated. His reply was $200. Not bad profit for $15 worth of parts. He wouldn't sell me a rebuild kit either! I think he needs a lesson in customer service. Refuse to deal with him!!
So I get a kit from Andover. Parts look the same...
 
JimNH said:
I’m that thread the picture @concours posted looks like mine. Sad that the original vendor is not forthcoming with parts for maintenance.
Click to expand...
Sadly, Al Miles has passed. RIP
😞

But, Chris ( @CH53MechWest ) at Fair Spares New England bought his stock, and has since supplied me with the rubber parts to refresh my sleeved master.

A GREAT vendor for Norton parts!

nortoncommando.com

Norton Commando Parts - Fair Spares New England

#1 US-based supplier of genuine Norton Commando parts. Best prices and great service. Free shipping for the continental US. Hard to find parts & kits.
nortoncommando.com nortoncommando.com
 
concours said:
Sadly, Al Miles has passed. RIP
😞

But, Chris ( @CH53MechWest ) at Fair Spares New England bought his stock, and has since supplied me with the rubber parts to refresh my sleeved master.

A GREAT vendor for Norton parts!

nortoncommando.com

Norton Commando Parts - Fair Spares New England

#1 US-based supplier of genuine Norton Commando parts. Best prices and great service. Free shipping for the continental US. Hard to find parts & kits.
nortoncommando.com nortoncommando.com
Click to expand...
Excellent! I see the area code is for western Massachusetts.
 

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