Fork Rattle - Need O ring size? (2015)

1up3down · Jul 20, 2015

Hi all,

I need to replace the O rings that go between the upper fork legs and the ears

can someone tell me what side, ID and thickness to get? should be available at a local hardware shore if I had the size

thanks!

L.A.B. · Jul 20, 2015

The 061900 O-ring is basically the same as the Amal carb flange O-ring 033281:

http://www.nortonmotors.de/ANIL/Norton% ... e-list.php

061900 O-RING 033281

....and one of which I measured up to be: 1.3/8 I.D. x 1/6 C.S. (1.364" x 0.070", or O-ring size "-28" ).
http://www.broadleyjames.com/o-rings-size-chart.html

Note that you need six O-rings-as there should be two at the bottom and one at the top on each side.

1up3down · Jul 20, 2015

thanks Les!

CanukNortonNut · Jul 21, 2015

L.A.B. said:
The 061900 O-ring is basically the same as the Amal carb flange O-ring 033281:

http://www.nortonmotors.de/ANIL/Norton% ... e-list.php

061900 O-RING 033281

Click to expand...

....and one of which I measured up to be: 1.3/8 I.D. x 1/6 C.S. (1.364" x 0.070", or O-ring size "-28" ).
http://www.broadleyjames.com/o-rings-size-chart.html

Note that you need six O-rings-as there should be two at the bottom and one at the top on each side.

+1 same O-ring.
CNN

Connie73 · Aug 2, 2015

1up3down, does this rattle only happen when your in low speed and go over a marginal bump. I have a knocking noise at low speed going over small bumps, its definatly in the front end area. Checked all the fender bolts, disc brake bolts and fittings and the speedo/tacho mounts. Also checked the headlight to be tight as well.

Hobot · Aug 2, 2015

IF just the head light mounts rattle, while waiting on oil rings and time to steal for fork removal I have gone many silent rough miles with black elect or clear packing tape. Couple years headlight was missing clips which also rattles and screw light aim but clear tape did the trick and not easy to notice but the glue does leave a mess and can enhance corrosion on chrome. Trixie gets forks opened for new rubbers as also needs new clock glass anyway so hey I find I am a more efficient mechanic when patient enough for double incentives.

tomspro · Aug 3, 2015

Connie73 said:
1up3down, does this rattle only happen when your in low speed and go over a marginal bump. I have a knocking noise at low speed going over small bumps, its definatly in the front end area. Checked all the fender bolts, disc brake bolts and fittings and the speedo/tacho mounts. Also checked the headlight to be tight as well.

is it more of a 'clunk' than a 'rattle'.
if so, you are hearing the stock fork bottom out.
Not sure if there is another solution, but the best cure is a set of Lansdowne internals.

PeterJoe · Aug 3, 2015

Connie73 said:
1up3down, does this rattle only happen when your in low speed and go over a marginal bump. I have a knocking noise at low speed going over small bumps, its definatly in the front end area. Checked all the fender bolts, disc brake bolts and fittings and the speedo/tacho mounts. Also checked the headlight to be tight as well.

See if the left hand fork slider moves back and forth along the wheel's axle. If you can, then the pinch bolt is not tight enough. This is another source of front end rattle as you described.

Peter Joe

850commando · Apr 22, 2020

1up3down said:
Hi all,

I need to replace the O rings that go between the upper fork legs and the ears

can someone tell me what side, ID and thickness to get? should be available at a local hardware shore if I had the size

thanks!

check with any industrial hydraulics shop. you want to buy -028 oring

Fork Rattle - Need O ring size? (2015)

1up3down

L.A.B.

Moderator

1up3down

CanukNortonNut

Connie73

Hobot

tomspro

PeterJoe

850commando

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