BritBike Forum logo
BritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorThe Bonneville ShopBritBike Sponsor
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
ShoutChat Box
Comment Guidelines: Do post respectful and insightful comments.
Buy BritBike staff a coffee
Buy BritBike's staff a coffeeStill here since 1996 serving BritBike enthusiasts..
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Member Spotlight
Posts: 134
Joined: October 2012
Show All Member Profiles 
Newest Members
rudi, Derek, Psychorider, Shedengineering, Shayne Brown
10860 Registered Users
Top Posters(30 Days)
franko 180
reverb 64
DavidP 63
NickL 58
Popular Topics(Views)
1,006,064 mail-order LSR
a word from..
Forum Statistics
Forums34
Topics67,756
Posts680,007
Members10,860
Most Online14,755
May 5th, 2019
Who's Online Now
56 registered members (Al Eckstadt), 494 guests, and 663 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Clutch nut size? #775296 05/31/19 11:10 pm
Joined: Oct 2017
Posts: 273
N
Nick H Online Content OP
BritBike Forum member
OP Online Content
BritBike Forum member
N
Joined: Oct 2017
Posts: 273
Working on a Lightning and I have 2 motors. Ordered part number 68-3300, clutch nut from an eBay seller that sells lots of British bike parts.
It doesn't fit either of my transmission main shafts. Seems to small.
Ordered another, same part from a Britbike forum sponsor, it is identical and doesn't fit.
Every reference says this should be 9/16" 20 tpi
(except the Greg Marsh fastener database which says 68-3300 is 13/16" 20 tpi)
Should I look for a 13/16" 20 tpi nut? Can't be that large.
I'm tempted to buy a 5/8" 20 tpi from British Tool and Fastener to see if it fits.
Anyone know what might be going on.

Last edited by Nick H; 05/31/19 11:13 pm.

1966 BSA Lightning
1967 Triumph "Choppa"
Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK
British motorcycles on e-Bay North America
Re: Clutch nut size? [Re: Nick H] #775333 06/01/19 6:21 am
Joined: May 2013
Posts: 5,876
Allan Gill Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: May 2013
Posts: 5,876
I bought a couple and found the same problem, just wouldn’t start on the threads. It needed a tap running though (but not far enough through to thread onto the aero fit part ) also I had to put it in the large to create a leading edge like the originals as even after the tap had gone through it still wouldn’t start.


beerchug
Re: Clutch nut size? [Re: Allan Gill] #775361 06/01/19 1:28 pm
Joined: Oct 2017
Posts: 273
N
Nick H Online Content OP
BritBike Forum member
OP Online Content
BritBike Forum member
N
Joined: Oct 2017
Posts: 273
Originally Posted by Allan Gill
I bought a couple and found the same problem, just wouldn’t start on the threads. It needed a tap running though (but not far enough through to thread onto the aero fit part ) also I had to put it in the large to create a leading edge like the originals as even after the tap had gone through it still wouldn’t start.


This suggests these parts are defective, no?
I'll have to invest in a tap.
No lathe so maybe a reamer to create a leading edge.

Or better, find a used part.

Last edited by Nick H; 06/01/19 2:36 pm.

1966 BSA Lightning
1967 Triumph "Choppa"
Re: Clutch nut size? [Re: Nick H] #775427 06/02/19 8:44 am
Joined: May 2013
Posts: 5,876
Allan Gill Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: May 2013
Posts: 5,876
Agreed Nick, poorly made indeed even if they are using the right materials. I’d refrain from using a used one, only reason I changed mine was it wouldn’t hold torque anymore, soon as I opened the throttle hard the nut would unwind off its thread, although locktite might help but I try to refrain from using it in such application.


beerchug
Re: Clutch nut size? [Re: Nick H] #775432 06/02/19 11:03 am
Joined: Aug 2001
Posts: 4,682
gavin eisler Online Content
BritBike Forum member
Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 4,682
I use blue nut lock on the clutch nut, never had any bother with it.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Clutch nut size? [Re: Nick H] #775436 06/02/19 12:28 pm
Joined: Aug 2001
Posts: 7,903
triton thrasher Online Content
BritBike Forum member
Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,903
I would always Loctite a clutch centre nut.


Amateur Loctite enthusiast.
Re: Clutch nut size? [Re: Nick H] #775469 06/02/19 9:10 pm
Joined: Dec 2013
Posts: 4,741
kevin roberts Offline
DOPE
Offline
DOPE
Joined: Dec 2013
Posts: 4,741
i also.

the nut on the other end too


every day you do not take a chance is a day of your life that you will never get back.
Re: Clutch nut size? [Re: Nick H] #775515 06/03/19 10:42 am
Joined: May 2004
Posts: 4,104
B
BSA_WM20 Offline
BritBike Forum member
Offline
BritBike Forum member
B
Joined: May 2004
Posts: 4,104
Blue for this little black duck as well


Bike Beesa
Trevor
Re: Clutch nut size? [Re: Nick H] #775521 06/03/19 12:40 pm
Joined: May 2013
Posts: 5,876
Allan Gill Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: May 2013
Posts: 5,876
interesting! I'always refrained from it as (on the A65) its a self locking nut, I did fit some locktite on a setscrew that was using a stover nut (looks like its been centre punched on 3 sides)

example of stover nut

Couldn't remove it again afterwards and had to drill the setscrew out. On mudguards I use locktite regardless of the nut type.


beerchug
Re: Clutch nut size? [Re: Nick H] #775563 06/03/19 10:13 pm
Joined: Jan 2014
Posts: 371
N
NickL Offline
BritBike Forum member
Offline
BritBike Forum member
N
Joined: Jan 2014
Posts: 371
Nothing worse than your nuts falling off eh?

I'd get on to the bloke who sold those nuts to you and tell him you want the mainshafts that go with them for free.
Sod messing about with taps unless he's paying for them.

A drop of blue loctite never hurts on the clutch centre nut and the crank one too.

Re: Clutch nut size? [Re: Nick H] #775567 06/03/19 11:14 pm
Joined: Oct 2006
Posts: 3,179
I
Irish Swede Online Content
BritBike Forum member
Online Content
BritBike Forum member
I
Joined: Oct 2006
Posts: 3,179
WHO is that eBay seller? What eBay alias does he go by?

They all use aliases anyway, so his personal name won't be mentioned.

Everyone on this site needs to know so we can stay away from dealing with him.
WAAAYYY too much of this goes on with eBay sellers.

Re: Clutch nut size? [Re: Nick H] #775569 06/03/19 11:19 pm
Joined: Oct 2017
Posts: 273
N
Nick H Online Content OP
BritBike Forum member
OP Online Content
BritBike Forum member
N
Joined: Oct 2017
Posts: 273
The eBay seller is "smmotorco" but I also bought one from site sponsor CBS. They claim to have used the nut on Triumphs with no issues and offered a refund if I returned it.

I wonder if Allan recalls where he purchased his.

Last edited by Nick H; 06/03/19 11:21 pm.

1966 BSA Lightning
1967 Triumph "Choppa"
Re: Clutch nut size? [Re: Nick H] #775599 06/04/19 6:32 am
Joined: May 2013
Posts: 5,876
Allan Gill Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: May 2013
Posts: 5,876
Just checked, April last year I got 2x from Draganfly. Having this problem since I’ve been in to Britbike’s I often don’t have the time to pee about sending stuff back and often just sort the problem my self as it’s much quicker. Draganfly have a lot of NOS parts and an easy to use site so I often buy from them.

As for the locktite, I wonder what the actual torque applied is when you add locktite to the threads as it suddenly becomes a lot higher than 60ft/lb.


beerchug

Moderated by  Allan Gill, Jon W. Whitley 

Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | DVD- Manuals & Parts books
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.7.3