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Rear shock preload

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Can someone tell me how much stiffer you’ll make the rear shock by a complete revolution in of the spring nut? Have the back half off doing some work so I can’t do the sag method and the adjustment nut is staring me in the face [emoji31]. I’m 290 and 6’2” so she sagging more than I’d like. Thanks!

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I already went down this road as  a 290# dude.   At 290# you are way too far past stock spring rate to get a decent ride.  Yes, you can crank it down 3 turns and harden both your compression and rebound clickers so you can ride the bike. It will ride like crap and be harsh, and you will only use 60% of the suspension stroke.

At about the 1000 mile mark, I had Suspension Dynamics install a 6.8kg/mm rear spring and two new 0.54kg/mm front springs, then all new valving for the new spring rates. 

Bike is a dream to ride, suspension is soft, uses the entire stroke and hooks up in the dirt.  I also had them install the ZETA toolless clickers on both ends of the forks.

Do yourself a favor and put in new springs and re-valve it

 

Edited by MVI
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I already went down this road as  a 290# dude.   At 290# you are way too far past stock spring rate to get a decent ride.  Yes, you can crank it down 3 turns and harden both your compression and rebound clickers so you can ride the bike. It will ride like crap and be harsh, and you will only use 60% of the suspension stroke.
At about the 1000 mile mark, I had Suspension Dynamics install a 6.8kg/mm rear spring and two new 0.54kg/mm front springs, then all new valving for the new spring rates. 
Bike is a dream to ride, suspension is soft, uses the entire stroke and hooks up in the dirt.  I also had them install the ZETA toolless clickers on both ends of the forks.
Do yourself a favor and put in new springs and re-valve it
 

Thanks! What’s the cost for the work? I may save it for a job in the winter. So temporary three turns?

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Most shock/fork data you need is here

https://racetech.com/ProductSearch/12/Honda/CRF450L/2019

It's not on RaceTech's site, but the Front Fork Spring is a 5.0N/MM https://www.hondapartshouse.com/oemparts/a/hon/5b8f064d87a8661554428992/front-fork

The Rear Shock Spring is a 52N/mm  https://www.hondapartshouse.com/oemparts/a/hon/5b8f064d87a866155442899c/rear-shock-absorber

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Thank you! Using this calculator below it looks like the factory springs are .51kg which is what the racetech calculator says I need for my riding. But they want me to greatly increase the rear shock based on my weight....but I already knew that. That calculator is fun to play with. Eventually I'm going to take this bike on a MX track for some light play riding. Maybe someday I'll bump the front springs to .52kg

http://www.kylesconverter.com/mass/newtons-to-kilograms

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