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Ask an Expert GSXR750K4 FRONT END KNOCK Suspension

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lar1852

Joined:

Apr 13

Posts: 2

lar1852 says:

GSXR750K4 FRONT END KNOCK

I have a front end knock which I cannot find the sourse of.  When I am riding in slow traffic it is most noticable.
I have fitted new brake pads and had new head race bearings fitted, but still no solution.  My fork seals and new fork oil were replaced reletively recently too.
I am being told this is common, and it may be something to do with my fork internals.
Can you help?

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  • Posted 2 years ago (16 April 2013 10:36)

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James600zx

Joined:

Sep 07

Posts: 2737

James600zx says:

Knock.

In slow traffic is it knocking or clicking with each revolution of the wheel? You can reproduce that by spinning the wheel on a front paddock stand. Or is it only doing it when you brake? Either way, it could be the brake pads moving a bit in the caliper, which is normal.

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lar1852

Joined:

Apr 13

Posts: 2

lar1852 says:

Front end knock.

Does not knock when spinning the wheel, but does as I roll over bumps in the road.  I may be mistaken, but the knock sounds as if it is coming from the top of the front suspension.

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Dabbsy

Joined:

Aug 02

Posts: 485

Dabbsy says:

knock

I'm assuming that you didn't detect any excessive float in the discs when you changed the pads? In which case you're right that it is probably fork internals as you've changed the head bearings as well. According to Gareth Evans at Reactive, at your bike's age it's quite likely that the fork bushes have worn. There are two in each leg, one at the bottom of the slider just behind the fork seal and the other at the top of the stanchion.

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eatcs01

Joined:

Aug 02

Posts: 3251

eatcs01 says:

GSXR knock

You may have fitted new head races, but have they been adjusted correctly??

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Nippy N

Joined:

Jul 08

Posts: 4

Nippy N says:

!!!IMPORTANT!!!

Just read your letter in this week's MCN and thought I'd better contact you. I had a very similar problem to the one you describe last year with my '07 Blade. Knock from the front end, mainly in town at slow speeds. It got progressively worse but I couldn't find the problem. In the end, the problem found me and one side of my front wheel bearing collapsed, luckily at a reasonable speed! When I took the wheel out, the bearing cage on one side had completely collapsed. Looked like it was due to some moisture ingress some time in the past as the bearing and cage had rusted out. Check your wheel bearings before you ride it again! Cheers.

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