Clunking sound over small to large bumps on a curvy - Page 2 - SV650.org

jambo · 12-12-06, 04:24 PM

With a lot of bikes a "clicking" or "clunking" noise from the front end when transferring weight or hitting bumps can be an indication that the head races are loose. The SV is no exception. However, as others have pointed out the standard forks do clunk a bit. Stiffer springs / fork oil, I believe lessens this but I wouldn't get too hung up on it.

As an Aside "Triple clamp" is US-speak for Top & bottom yokes

12-12-06, 04:31 PM

Quote:

Originally Posted by jambo

With a lot of bikes a "clicking" or "clunking" noise from the front end when transferring weight or hitting bumps can be an indication that the head races are loose. The SV is no exception. However, as others have pointed out the standard forks do clunk a bit. Stiffer springs / fork oil, I believe lessens this but I wouldn't get too hung up on it.

As an Aside "Triple clamp" is US-speak for Top & bottom yokes

Yep, standard SV forks bottoming out.

Dan

12-12-06, 05:05 PM

Mine still clunks with the SRAD750 front end!!

12-12-06, 05:13 PM

mine doesn't with emulators, other springs and oil.

northwind · 12-12-06, 05:14 PM

I'm suer further down that thread I called that guy an idiot

There's loads of reasons a bike's front end can clunk, assuming it's head bearings is just plain stupid, and telling people that they have to tighjten their head bearings is completely irresponsible. It might be head bearings, aye. Remind me next time I see you and I'll check it

But there's loads of things that can cause a clunk, the SV has a habit of clunking. I think RandyO blames the gauge cluster, but he has a naked. Mine was something internal in the forks, though I have no idea what. It stopped completely when I changed the oil for 15W. Or it could be your brake pads. It could even be the calipers having a rattle, or loose/worn brake discs, or some other loose part just about anywhere up front.

12-12-06, 05:24 PM

Quote:

Originally Posted by TSM

Quote:

Originally Posted by chazzyb

Whatever you do, don't adjust your head bearings as described: it's ********.

Not totaly, head bearings do click when loose under braking, but its unlikley to be that on standard SV's as most people know the cluck is actualy from the fork internals and they all do that. Now if it only happened under quick/heavy braking then i would look at the bearings.

I agree. The point I'm making is that you do not adjust head bearings as described!

northwind · 12-12-06, 06:59 PM

Having said that, in Duck-Man's case it's most likely caused by an essential bit having gone missing

12-12-06, 08:49 PM

the fork inernals in the sv's are dirt cheap. they "clunk" becasue of the dampening system on the sv's. there are only two holes (i think i remember rightly) lsat time i took the forks apart, and i spoke to the guy at cresent, and the sound is basicly the rods bottoming out on the bottom of the forks. where the oil cannot be dispersed through the dampening holes quickly enough and thus creates the forks bottoming out. you get it a lot on cheap montian bike forks.
if you strip a decent pair of mountian bike forks, like marzocchis or rock shocks, you would see that the damper rods have multiple holes in. my old marzochhi forks had about 12 holes per damping rod as bicycle forks under do more movement in general, they need to disperse more fluid faster, so they have more holes.

I was thinking of drilling extra holes in the damper rods so i will post the results when the bike s back on the road.

northwind · 12-12-06, 10:47 PM

Well, if you drill extra holes you're going to massively effect the damping rates... You don't really want that, SV forks are underdamped as standard. You'd probably end up having to add heavier oil to counter it, which would defeat the purpose. Mountain bike forks are doing a completely different job, you can't really compare a 170 kilo bike with a 10 kilo one, or the forces from hitting a pothole at 100 with landing a big jump at 20mph.

Mountain bike forks are still incredibly basic- but they have an easier job since compression modulation is the key, rebound's much less important. SV forks need to balance the two. Really all damper rod forks are a compromise.

13-12-06, 08:30 AM

Quote:

Originally Posted by northwind

Having said that, in Duck-Man's case it's most likely caused by an essential bit having gone missing

HAHAHA!

It was only the one thing missing!

12-12-06, 04:24 PM	#11
jambo Member Mega Poster Join Date: Aug 2003 Location: Croydonia Posts: 5,376	With a lot of bikes a "clicking" or "clunking" noise from the front end when transferring weight or hitting bumps can be an indication that the head races are loose. The SV is no exception. However, as others have pointed out the standard forks do clunk a bit. Stiffer springs / fork oil, I believe lessens this but I wouldn't get too hung up on it. As an Aside "Triple clamp" is US-speak for Top & bottom yokes __________________ Modern motorcycles are bloody brilliant, enjoy it while we can

12-12-06, 05:14 PM	#15
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	I'm suer further down that thread I called that guy an idiot There's loads of reasons a bike's front end can clunk, assuming it's head bearings is just plain stupid, and telling people that they have to tighjten their head bearings is completely irresponsible. It might be head bearings, aye. Remind me next time I see you and I'll check it But there's loads of things that can cause a clunk, the SV has a habit of clunking. I think RandyO blames the gauge cluster, but he has a naked. Mine was something internal in the forks, though I have no idea what. It stopped completely when I changed the oil for 15W. Or it could be your brake pads. It could even be the calipers having a rattle, or loose/worn brake discs, or some other loose part just about anywhere up front. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

12-12-06, 06:59 PM	#17
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Having said that, in Duck-Man's case it's most likely caused by an essential bit having gone missing __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

12-12-06, 10:47 PM	#19
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Well, if you drill extra holes you're going to massively effect the damping rates... You don't really want that, SV forks are underdamped as standard. You'd probably end up having to add heavier oil to counter it, which would defeat the purpose. Mountain bike forks are doing a completely different job, you can't really compare a 170 kilo bike with a 10 kilo one, or the forces from hitting a pothole at 100 with landing a big jump at 20mph. Mountain bike forks are still incredibly basic- but they have an easier job since compression modulation is the key, rebound's much less important. SV forks need to balance the two. Really all damper rod forks are a compromise. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Knocking over bumps	AndyBrad	SV Talk, Tuning & Tweaking	12	02-09-08 01:56 PM
help needed, clunking sound and shuddered!	ScottishRawker	SV Talk, Tuning & Tweaking	15	29-06-08 08:44 AM
Ladies Bike gear - Small or Extra Small!	StreetHawk	Stuff Wanted	8	07-12-07 06:18 PM
Would You Like More Bumps With That Sir?	RhythmJunkie	Idle Banter	15	25-07-07 07:02 AM
Small windscreen for curvy naked SV 650	The Butler	SV Talk, Tuning & Tweaking	9	16-03-06 03:29 PM

12-12-06, 05:05 PM	#13
BILLY Guest Posts: n/a	Mine still clunks with the SRAD750 front end!!

12-12-06, 05:13 PM	#14
r4ce_e3nd Guest Posts: n/a	mine doesn't with emulators, other springs and oil.

12-12-06, 08:49 PM	#18
riktherider Guest Posts: n/a	the fork inernals in the sv's are dirt cheap. they "clunk" becasue of the dampening system on the sv's. there are only two holes (i think i remember rightly) lsat time i took the forks apart, and i spoke to the guy at cresent, and the sound is basicly the rods bottoming out on the bottom of the forks. where the oil cannot be dispersed through the dampening holes quickly enough and thus creates the forks bottoming out. you get it a lot on cheap montian bike forks. if you strip a decent pair of mountian bike forks, like marzocchis or rock shocks, you would see that the damper rods have multiple holes in. my old marzochhi forks had about 12 holes per damping rod as bicycle forks under do more movement in general, they need to disperse more fluid faster, so they have more holes. I was thinking of drilling extra holes in the damper rods so i will post the results when the bike s back on the road.