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pattern parts...and things that drive you crazy #724442
02/06/18 1:40 am
02/06/18 1:40 am
Joined: Aug 2001
Posts: 2,550
New Hampshier USA
MikeG Offline OP

BritBike Forum member
MikeG  Offline OP

BritBike Forum member
Joined: Aug 2001
Posts: 2,550
New Hampshier USA
I ordered a replacement upgraded clutch center for an A10 4 spring clutch to stop the outer drum from wobbling like they do from original. Got the new one in complete with thrust washer and checked all measurements against the original and it was dead on. Installed the new center with the original inner and outer clutch drums and original roller bearings, these have been in service and working fine for years. Put the new center on the main shaft and assembled the inner and outer drums, installed the center nut and found they were then locked up tight together. Pulled everything apart and re-measured old against new and the rollers against known proper size again...still all within specs. Assembled once more with same results. This time I pulled it apart and assembled the entire clutch on a spare main shaft clamped in a vice so I could see exactly what was going on. Even with the inner drum and nut on and torqued up the outer drum stood about .020 proud of the thrust washer..tried it with several outer clutch drums with the same result. Re-measured the new center again and found no oversize or taper in the bearing contact surface. I finally gave the outer drum a quick rap with a hammer handle in by the roller race, and it set right down into place tight against the thrust washer. Everything spins fine, no binding or drag, and it all seems as it should be. If I assemble it with the old clutch center everything slips together just fine without the hammer tap...not quite sure what to think of this one really. My initial instinct is to use the new center as is (hammer tap and all) and not worry about it, I just cant understand where that little bit of resistance to seating the outer drum is coming from.


1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
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Re: pattern parts...and things that drive you crazy [Re: MikeG] #724490
02/06/18 2:03 pm
02/06/18 2:03 pm
Joined: Aug 2001
Posts: 2,531
Springfield Nebraska
Richrd Online content
BritBike Forum member
Richrd  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 2,531
Springfield Nebraska
when I was doing restos I figured %30 of my time was making parts fit and work


Rich (member ThreeMustGetBeers)
"It's not always about going fast. Sometimes it's nice to slow down" (Wendy E.2016)

69 bonney
72 commando
75 commando interstate
06 Suzu..Suzu.. uh appliance
couple of beesas a ducati
and the Snake Bike
Re: pattern parts...and things that drive you crazy [Re: MikeG] #724493
02/06/18 2:24 pm
02/06/18 2:24 pm
Joined: Oct 2006
Posts: 2,427
Elburn, Ill. USA
I
Irish Swede Online content
BritBike Forum member
Irish Swede  Online Content
BritBike Forum member
I
Joined: Oct 2006
Posts: 2,427
Elburn, Ill. USA
Mike, did you use a genuine BSA hammer?

Seriously, sometimes close tolerances require a little help in getting them to "seat" properly.

Re: pattern parts...and things that drive you crazy [Re: Irish Swede] #724499
02/06/18 3:19 pm
02/06/18 3:19 pm
Joined: Aug 2001
Posts: 2,550
New Hampshier USA
MikeG Offline OP

BritBike Forum member
MikeG  Offline OP

BritBike Forum member
Joined: Aug 2001
Posts: 2,550
New Hampshier USA
Originally Posted by Irish Swede
Mike, did you use a genuine BSA hammer?

Seriously, sometimes close tolerances require a little help in getting them to "seat" properly.


No, sad to say but I don't have any factory hammers so a rubber mallet had to suffice. Pretty sure it's like you say about close tolerances, and the only thing I could measure it with was a pair of cheap digital calipers so...?? Pretty sure it was much the same way when these bikes were being assembled new so I'm not going to worry about it.

Richrd...If you're not doing restos what are you building these days?


1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
Re: pattern parts...and things that drive you crazy [Re: MikeG] #724567
02/06/18 10:52 pm
02/06/18 10:52 pm
Joined: Apr 2013
Posts: 176
Illinois
S
Spitfire Ken Offline
BritBike Forum member
Spitfire Ken  Offline
BritBike Forum member
S
Joined: Apr 2013
Posts: 176
Illinois
YOU SHOULD HAVE THIS HAMMER REPRODUCED FOR OTHR UNFORTNATE SOULS.


The Devil is in the details.

1957 BSA A10 Spitfire Scrambler (number matching, very correct in decent condition)
1965 BSA A65 Lightning Rocket "Clubman" (restored)
1966 BSA A65 Spitfire MK-II (restored)
2001 Kawasaki W650

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