Forks Clunking

Wheels, shocks, forks, frame
Post Reply
headcoats
Avgas Sniffer
Posts: 2120
Joined: Sat Jun 09, 2007 10:10 am
Location: Pig on the wall country

Forks Clunking

Post by headcoats »

The KR1S forks are clunking on my Hybrid :?
It's not the brakes as I put the front wheel against a post and pushed down

Also put fingers on headstock and rocked it backwards and forwards but couldn't detect any play
Bushes didn't have signs of wear when I fitted them but they were the ones that came with the forks

Sounds like it is coming from the upper forks or headstock though,unless the sound is travelling?

Got me stumped :oops:
Can it yer old boiler
User avatar
JanBros
Avgas Sniffer
Posts: 3306
Joined: Wed Jul 26, 2006 11:50 pm
Location: the land of Francorchamps

Re: Forks Clunking

Post by JanBros »

worn bushings inside the forks ?
My ultimate goal is to die young as late as possible !
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Re: Forks Clunking

Post by Luders »

Yes, it sounds like the glide bushes Martin
headcoats
Avgas Sniffer
Posts: 2120
Joined: Sat Jun 09, 2007 10:10 am
Location: Pig on the wall country

Re: Forks Clunking

Post by headcoats »

Well I was going to take forks off to give the bottoms a blast with my new can of Tough black so will have to take forks apart
The clunk happens right at the beginning of travel if that's any help

Never got my head around the correct level of fork oil as in the air gap with spring out and fork compressed :?:
What do folks do here :P
Can it yer old boiler
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Re: Forks Clunking

Post by Luders »

I measure the oil on the KR-1S, 336ml per leg for a straight change, or 396ml if they've had a rebuild.
headcoats
Avgas Sniffer
Posts: 2120
Joined: Sat Jun 09, 2007 10:10 am
Location: Pig on the wall country

Re: Forks Clunking

Post by headcoats »

Cheers Benjamin but don't yer use the air gap,dipstick method :mrgreen:
Can it yer old boiler
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Re: Forks Clunking

Post by Luders »

Nope, just measure the oil and wack it in
headcoats
Avgas Sniffer
Posts: 2120
Joined: Sat Jun 09, 2007 10:10 am
Location: Pig on the wall country

Re: Forks Clunking

Post by headcoats »

If I take each fork leg off then would I be able to feel the clunk just pushing one leg down at a time ?
Or is it something you can only feel on the bike because of the weight etc :?
Can it yer old boiler
User avatar
JanBros
Avgas Sniffer
Posts: 3306
Joined: Wed Jul 26, 2006 11:50 pm
Location: the land of Francorchamps

Re: Forks Clunking

Post by JanBros »

just take out the wheel , remove the front fender with it's brace and release the springs. now test each fork leg seperatly just like you would test for play on the headstock bearrings.
My ultimate goal is to die young as late as possible !
headcoats
Avgas Sniffer
Posts: 2120
Joined: Sat Jun 09, 2007 10:10 am
Location: Pig on the wall country

Re: Forks Clunking

Post by headcoats »

Well it's back together !! Not sure if I have cured it #-o
One thing for sure was the state of the fork oil which I guess was 4 years old but not many miles :shock:
It's one thing a lot of peeps ignore :?:
Can it yer old boiler
Luders
Avgas Sniffer
Posts: 3926
Joined: Fri Jun 18, 2010 11:29 am
Location: Oxfordshire

Re: Forks Clunking

Post by Luders »

It is Martin, that and the rear shock.
User avatar
Garry
Premix Junkie
Posts: 1436
Joined: Tue Jul 25, 2006 8:01 pm
Location: E.Midlands

Re: Forks Clunking

Post by Garry »

mine does the same thing

think its head bearings

they feel tight - even pass the MOT
Smokings Good For You
headcoats
Avgas Sniffer
Posts: 2120
Joined: Sat Jun 09, 2007 10:10 am
Location: Pig on the wall country

Re: Forks Clunking

Post by headcoats »

May have got to the bottom of it and I think it was the taper bearing shell that fits in the top of the LC frame,it was a loose fit :shock:

I used some bearing Loctite in there so will have to see what happens :?
Can it yer old boiler
fred
Oil Injector
Posts: 926
Joined: Sat Mar 22, 2008 5:42 pm
Location: retford n,nott`s working in cotswolds
Contact:

Re: Forks Clunking

Post by fred »

easy fix ,if ever the bikes stripped down ish ,if you know any one with oxy acetaline ,with a very oxydising flame ,test on a bit of normal mild steel just till you get like lemonade bubbles ,once the torch is set just do a warm on the inside of the bearing cup at 12 ,6 ,3 and 9 o`clock this will shrink to take up the play ,if not enough ,let it cool ,then go inbetween where youve heated,plastic fantastic filler will always fail ,take a hour or so ,glad you sussed it out
Post Reply