Front fork noise - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 12 Old 06-30-2012, 11:11 AM Thread Starter
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Front fork noise

When I ride over speed bumps, the front fork often extends to the maximum and stops with a metal-to-metal noise

Is this normal or are there ways to eliminate this?
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post #2 of 12 Old 06-30-2012, 11:56 AM
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bang?

maybe your fork fluid left the bike before you bought it?

or someone before you revalved it badly

BTW - how fast are you going over the speed bumps?

I have 4 speed bumps on my morning commute - but I don't blast over them, I only go about 20 mph, my butt off the seat
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post #3 of 12 Old 06-30-2012, 12:13 PM Thread Starter
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I don't drive faster than the speed limit (30kph). I drive a '06 wee, only 15.000km on the odometer so it shoudn't be worn that much.

I suppose the noise is not dangerous, but I would expect some kind of rubber damper when the fork is extended to it's maximum, either compressed or released. But it doesn't seem to be any on my wee.

Earlier I drove a Honda CB500, and its back dampers had rubber inserts to avoid metal-to-metal.
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post #4 of 12 Old 06-30-2012, 03:51 PM
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I sometimes stand on the pegs and go over speed bumps at 80+ km/h; my bike doesn't make any kind of front-end noise. Sometimes I hear my chain slap on the swingarm when it's too loose.

Wees' forks are known to clunk on compression when hitting a bump , but it only seems to happen in cold weather (mine does this too; only in winter, and it does it even at slow speeds).
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post #5 of 12 Old 06-30-2012, 05:29 PM
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Sounds more like you are describing full compression, rather than full extension?

Try increasing the pre-load on your forks.
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post #6 of 12 Old 07-01-2012, 01:51 AM Thread Starter
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Quote:
Originally Posted by Flashmo View Post
Sounds more like you are describing full compression, rather than full extension?
Maybe I'm a little unclear here, English is not my native language. What I mean is that the fork gives a hammer-to-anvil type sound when it is fully extended (wheel and handle bar far from each other).

I have never managed to compress it fully yet, so I think the damping is OK. It seems to me that the damper is only one-way (compression).
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post #7 of 12 Old 07-01-2012, 05:45 AM
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The main purpose of the oil in forks is dampening the rebound.

IMHO

The amount of oil is TOO little. You can 1 at a time remove the cap and springs of each fork and measure down for correct oil height. I don't know the number. Some fork designs actually run out of dampening if the oil is low.

Note great care holding DOWN the cap as you near fully unscrewing them as it is possible to rip the very end of the threads as the spring forces pushes (can be dressed)


2nd obvious
If oil is OK then perhaps it is way to low in viscosity. Other wee may be better at picking the correct oil

3rd
You May be confusing a clunk from the steering head bearings. See if you can duplicate the noise by accel/braking quickly.


4th Turn up the radio
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post #8 of 12 Old 07-01-2012, 11:29 AM
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The forks have a top out spring, so unless that's been removed the source of the noise is elsewhere.

Rich Desmond
'07 DL650, '01 DR-Z400S, '99 SV650 (race bike), '80 GS1000S, '85 RZ350, '08 Ducati 848
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post #9 of 12 Old 07-01-2012, 11:52 AM
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rebound spring

Quote:
Originally Posted by RichDesmond View Post
The forks have a top out spring, so unless that's been removed the source of the noise is elsewhere.
yes, a small one -

funny thing is a Google search on "DL650 rebound spring" brings up a DL650 shop manual pdf!

the spring is part #6
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post #10 of 12 Old 07-01-2012, 12:51 PM Thread Starter
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Quote:
Originally Posted by richw View Post
You May be confusing a clunk from the steering head bearings.
Ah! "clunk" is the correct expression for what I experience. Thanx for all advices, I shall check closer once it stops raining
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