front disk brake

Larry · Jan 2, 2012

Anyone who has changed the brake from right side to left (1973) do you just use the same axle parts or do you need some 1975 parts ? I noticed a few of the part numbers are different, spacer, non disk side for one. Thanks,Larry

bwolfie · Jan 2, 2012

I just flipped it all 180 degrees, nothing special. Be sure to check your tire rotation direction.

Rohan · Jan 2, 2012

In theory, you need something to prevent the bearing retainers etc from undoing themselves, should they so feel like it ?

Which the Mk3 used. (How did they do it ?).

jeffdavison · Jan 2, 2012

Methinks the fork drain plugs will be on the higher side... shouldn't be too much of an issue.

JD

swooshdave · Jan 2, 2012

I do have to ask why.

L.A.B. · Jan 2, 2012

Rohan said:
In theory, you need something to prevent the bearing retainers etc from undoing themselves, should they so feel like it ?

Retainer (1).

Rohan said:
Which the Mk3 used. (How did they do it ?).

The 850 Mk3 front hub is different, as it has a circlip in place of the threaded bearing retainer.

jeffdavison said:
Methinks the fork drain plugs will be on the higher side... shouldn't be too much of an issue.

Same for all Mk3s, they just had the fork sliders swapped over.

Larry · Jan 2, 2012

Thanks for the replies, Swooshdave the bike pulls to the left, I've checked everything I can think of so this is a last resort ( at least with my limited knowledge) I understand changing the brake to the left side can make the steering more neutral. thanks again

Fullauto · Jan 2, 2012

I think that if that is your problem, then you have other issues.

L.A.B. · Jan 2, 2012

swooshdave said:
I do have to ask why.

post21720.html

L.A.B. · Jan 2, 2012

Fullauto said:
I think that if that is your problem, then you have other issues.

It's nothing new, it is mentioned in the NOC Service Notes.

http://archives.jampot.dk/Book/Workshop ... _Notes.pdf

You should all know the story of the front brake, position---originally fitted behind the right hand leg. For
some exceedingly technical reason this caused all the bikes to pull to the left, and made most of them so
bad that you couldn’t steer the machine hands-off. Nortons which wouldn’t steer hands off! And no-one
complained. Well, actually, about a dozen people did, but there wasn’t anything that could be done about
it. Anyway, later it was found that if you take the forks out of the yokes and swap them over the brake
finishes up in front of the left hand leg and the machine then steers O.K.

Rohan · Jan 2, 2012

That 'exceeding technical reason' , since it wasn't weight distribution, would have to be then that the front wheel wasn't perfectly centred on the bikes centreline ??

geo46er · Jan 2, 2012

Hi Larry,
I did the swap a few years ago and it did the trick. I had checked and/or tried all the other possibilities usings straight edges, strings, levels, laser levels, plumb lines from the ceiling, purpusely misaligning the rear axle, tie-rod headsteady, all to no avail. The fork swap was quick and easy and what a relief to finally drive down the road without that cursed pull to the left. Only drawback is that if you are running stock front fender you will have to lose the front fender stay. I just took it off and put the screws back in the holes.

GB

L.A.B. · Jan 2, 2012

Rohan said:
That 'exceeding technical reason' , since it wasn't weight distribution, would have to be then that the front wheel wasn't perfectly centred on the bikes centreline ??

If that theory was true, then reversing the assembly should result in the bike veering in the opposite direction-but that doesn't seem to happen.

Hobot · Jan 2, 2012

All bikes I've ever ridden on crowned drainage paved roads pulled to LH hands off even my SV650 with dual brakes. So its a mystery of what you did to counter the climb up road crowns. Biasis and radial tires have opposite crown and rut climb tendency but I foget which is which. Least pull to L was Ms Peel but given enough time she'd begin to drift L w/o body English. Looking up on interweb show many many type bikes pull to L but a hand full also claim various reconfigurations stopped it, so don't doubt its possible just not why or what matters.

Hobot · Jan 2, 2012

Here's a search list of why cycles pull to the LH, some with and some w/o hands on.
http://www.google.com/search?client=fir ... 1.6-1l12l0

front disk brake

Larry

bwolfie

Rohan

jeffdavison

swooshdave

L.A.B.

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Larry

Fullauto

L.A.B.

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L.A.B.

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Rohan

geo46er

L.A.B.

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Hobot

Hobot

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