Fork Clatter

[Bixxer Bob]

I know they all do it, but can someone remind me why?  It gets to be REALLLLLLY  annoying and I'd like to find a way to stop it. . . . .

[The Kurgan]

Call me insane... but I think its actually coming from the radiator fan. The fan has some play on its shaft. Test it, you might see that it makes the same clunking noise.

[tcbezza]

I have the same noise and I think I agree with The Kurgan in that is does sound like it comes from the radiator fans. If I grab a hold of one fan and move it back and forth I get exactly the same noise.

Have you tried temporarily padding the fans (when it is cold) to stop them moving and see if it still does it ???

[Silverstripes]

15 w oil in the forks worked for me. It still does the clatter once in a blue moon.

The handling is much improved as well. I stayed with standard springs just replaced 10 w with 15 w oil.

[Bixxer Bob]

Thnaks fror the tips guys.  It's due a change of fork oil so I'll try going up to 15W

[outrunner]

Mine is due a 24k sevice soon so I think I will also go with the 15 w oil, does anyone know the exact amount of oil in each leg?

Andy.

[Silverstripes]

Outrunner

The fork oil is done more by measurment than volume. With the spring removed and the fork empty follow this process

Operate the fork several times to expel any air.

Fully compress the fork.

Top up with fresh oil to a level as follows:

Up to Vin 198874 = 107mm
From Vin 198874 = 146 mm

I did mine by setting a depth gauge on my vernier. You then measure from the fork tube top to the oil level and set as below. When you get close its only best to add small amounts, or else you will be looking to remove oil.

I found it easy to do.

Then decompress the fork, replace the spring and the top cap tighten to 30 nm.

Replace the forks on the yoke and tighten the clamps to 20 nm

To complete the job I purchased two bottles of fork oil as each leg will take around 720 cc of oil.

All make sense ???

[Stretch]

15 w oil in the forks worked for me. It still does the clatter once in a blue moon.

The handling is much improved as well. I stayed with standard springs just replaced 10 w with 15 w oil.

Cool.  How much do you weigh?

[Silverstripes]

Stretch

96 kg and 6Ft 1in height

Not a Fat Ba---rd but heavy enough.

[Stretch]

That's about what I weigh... 211 pounds.

Thanks.

[iansoady]

Outrunner

Up to Vin 198874 = 107mm
From Vin 198874 = 146 mm

And on mine, which happens to be VIN 198874?

Actually I do know the answer.

[Silverstripes]

Ian

Direct lift from the manual with the Vin listing.

You have the elusive Vin are there any other instances where this Vin threshold is an issue. :?:

[NortonCharlie]

If you have the cast wheel model the later spoked wheels the earlier

[blacktiger]

The answer to why is there a knock from the forks is........from 2005 model they fitted new forks which has an internal valve which is supposed to reduce the dive when on the brakes. It's that valve that clonks.....apparently.

[Bixxer Bob]

In that case I'll be looking at how I can stop it when I change the fork oil.  If something's loose enough to clonk,  it should be possible to bush or shim it out somehow without affecting the action.  I'll have to tidy up the garage so that I can get to my lathe..... :roll: