Front fork sag

[KiwiBiker]

I've measured 40mm of static sag in my front forks. I'm guessing this is about twice what i should have?
I've got the preload wound down to full. I'm thinking this is because my springs are old?
Is the best option to replace the fork springs? Sounds expensive. Would adding more fork oil help in any way, my guess is no.
Any thoughts gladly received.

[Variablevalves suck]

Yes mate need heavier springs, they are known to be very soft from new.
Should have about 20/30 mm in the front.

[KiwiBiker]

Yes mate need heavier springs, they are known to be very soft from new.
Should have about 20/30 mm in the front.

Dang! Motorsport is an expensive business
I also discovered the compression damping was wound up to the hardest setting. Ive put it on the 10th click of 23 as I only weigh 58kg, real lightweight jockey.
I wound the preload back off the rear spring too until I had 10mm of static sag.

[Variablevalves suck]

Hi, have a Google around and have a read up on setting the sag.
10mm is very small especially if you on the road, I'd be running 20mm at the back and 25/30 at the front.
You better off on the soft side of everything if the bikes on the road, you get more feedback, if you get it set on the hard side it will feel wooden and its very easy to get the bike tank slapping over bumps.

[KiwiBiker]

Hi, have a Google around and have a read up on setting the sag.
10mm is very small especially if you on the road, I'd be running 20mm at the back and 25/30 at the front.
You better off on the soft side of everything if the bikes on the road, you get more feedback, if you get it set on the hard side it will feel wooden and its very easy to get the bike tank slapping over bumps.

It's a track only bike, completely stripped of street legal bits. That 10mm was the bike sag without me on it. It sags 30mm at the rear with me on it.
It sags 40mm on the front forks under the bikes own weight alone, I didnt even bother getting on it to check rider sag...

[Variablevalves suck]

Yes my wrong, I read that first but after the 40mm my head started thinking it was a with rider measurement.
Could be worth checking everything's in side and nothing is missing first.

[KiwiBiker]

Yes my wrong, I read that first but after the 40mm my head started thinking it was a with rider measurement.
Could be worth checking everything's in side and nothing is missing first.

Pretty sure its all there, I had the forks apart recently doing the fork seals. It's been diving like a U boat under braking since I got it.