KR-1S.co.uk Forum

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

worn bushings inside the forks ?

Yes, it sounds like the glide bushes Martin

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

I measure the oil on the KR-1S, 336ml per leg for a straight change, or 396ml if they've had a rebuild.

Cheers Benjamin but don't yer use the air gap,dipstick method

Nope, just measure the oil and wack it in

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

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.

Well it's back together !! Not sure if I have cured it
One thing for sure was the state of the fork oil which I guess was 4 years old but not many miles
It's one thing a lot of peeps ignore

It is Martin, that and the rear shock.

mine does the same thing

think its head bearings

they feel tight - even pass the MOT

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

I used some bearing Loctite in there so will have to see what happens

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