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bearpah

2014 CRF 450 - Suspesnion super harsh in chop

57 posts in this topic

Well I just picked up a 2014 CRF 450. I have always ran conventional springs and now with the new PSF, I know slim to none about. I weigh 225 and the bike is set up for someone who is 170-200 lbs. Now I set the front PSI to 35 lbs. and adjusted the clickers out 13 to standard spec. I went out and did two motos with it set like that and I thought that my hands and arms were going to fall off. The big jumps is fine and works great, the small chop is the killer. The suspension doesn't seem like it wants to absorb anything. So after moto 2, I dropped  the PSI in the forks down to 30, the minimum actually less than minimum by one pound. I went out and did  moto 3 and it was better but not anything to write home about. I also still left the compression set and the standard setting of 13 clicks out.  The other thing that I noticed after I did moto 3 is that i still have not used the entire stroke of the suspension. I have about 2" left to the bottom of the fork leg.

 

So my question is due to the fact that I am a heavier rider than recommended for the factory suspension. How can I adjust the suspension in order to get it more plush and not so harsh in the chop. Or do I just have to send it out and have the suspension revalved and new rear spring put in. I forget to mention I set he sag and the rear felt totally fine. So if someone could give me some pointers on what direction to go with this super stiff front super, I would greatly appreciate it. Thanks for your guy's time.

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You need to run a higher Psi for your weight, but forks may get pretty stiff with stock oil height. Try lowering oil to 215cc, and run psi at 40. This will hold bike up a bit more for you and if you need to, you can add more oil in 5cc increments. You can fine tune psi from there as well. Just a basic adjustment, hopefully it helps a bit. You should be within 39-40 psi valving changes after air/oil doesn't get you where you need to be

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You need to run a higher Psi for your weight, but forks may get pretty stiff with stock oil height. Try lowering oil to 215cc, and run psi at 40. This will hold bike up a bit more for you and if you need to, you can add more oil in 5cc increments. You can fine tune psi from there as well. Just a basic adjustment, hopefully it helps a bit. You should be within 39-40 psi valving changes after air/oil doesn't get you where you need to be

Marc are you saying it wont get better with a revalve?

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no it will get better, but just for simplicity, oil and air will help the cause.

 

i've got a larger rider who is on the same machine. the sponsored kid is hurt, so we need to adjust for the riders' size.

 

i've done several kawis, but only a couple of hondas. most of the riders are very light compared to a 225-240lb. rider.

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yeah ok i see! ....i worked a bit on a 13 with the help off others and get much better! i dont know the 14 with the new piston how it comes stock...

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go to the sdi website. the mod mv piston is very close to what stock is. minus the dual leaf spring type mid sdi offers.

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I just wanted to encourage this discussion. I have a '13' crf450r and this is very interesting to me as I am 194 lbs. and when I hit the weights, I go up to 210 - 220 lbs.

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I like what I have heard so far. Do to being an air fork now, and if I send it out to Precision Concepts, what exactly are they going to do in order to make the ride more forgiving or plush? I should say, what am I paying for if I can adjust the spring rate myself?

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Start with the adjustments on air and oil. Then run clickers 12c 14r test, and adjust as need be.

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Not sure if it's relevent, but for the 2013 MXA recommends 11c (out) and 10r (out).

clickers are pretty personal to your size, ability, and terrain!

its another few variables to play with...

Start with the adjustments on air and oil. Then run clickers 12c 14r test, and adjust as need be.

i would expect a suggestion of less rebound due to the higher pressure to tell you the truth....but am no expert!"....whats the thought, or is it something you found it works!

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Just a starting point. He mentioned precision concepts so, it may be an off road application as well. I've always preferred to start mid-clicker to slightly past and work back. Especially if off road is the application. But even in Mx, 12-14 reb can work well.

Depending on track conditions during the Mx a test sessions, they may have found that setting to work well where they happened to be.

Edited by GDI70
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If you like a common kyb fork, spring 5 Nmm, 340ccm oil and 5mm preload you need this to match as close as possible.

38 psi

215ccm oil

3,7 to 3,8 Nmm ballancespring.

~5% stiffer 2-5" stroke and ~ 5% softer from 6,5-8,5"

Same stiffnes at end.

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Ok, I am no suspension guy by no means. But is is fairly easy to adjust your oil level.  What does this entail? I have no fork wrenchs or anything like that?  Let me know, cause I am totally down for trying an figuring out this harsh ride.  I haven't looked in my owner's manual today cause I am still at work,  but does anyone know how much oil the forks come with stock ?


Ok, I am no suspension guy by no means. But is is fairly easy to adjust your oil level.  What does this entail? I have no fork wrenchs or anything like that?  Let me know, cause I am totally down for trying an figuring out this harsh ride.  I haven't looked in my owner's manual today cause I am still at work,  but does anyone know how much oil the forks come with stock ?

Also forgot to ask what this means  "
3,7 to 3,8 Nmm ballancespring" or what does in refer to . Thanks

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At your weight I'd be adding LOTS of midvalve into the bike.

If you really focus on the forks - I think you will find the first 6 inches for you are blowing through.

Get either an oring or a tierap installed, in a perfectly flat feild or parking lot - go like third gear then hit the brakes as if you were coming into a turn (stand up etc...) Look at the strap - You will be very surprised at how muhc travel you are using with NO bumps in the equation!

Edited by harrperf
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Mb1 makes a mid valve piston for these and really helps the forks out

Actually made by Suspension Direct Inc

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The 14 have a new style mid Piston!

It' just a larger version of the 12 piston .

( 3 port)

The 12 Piston does not fit!!!!

"12 28mm

"14 32mm

Yes, you need a different valving also but at first i would set the spring correctly.

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bearpah

On the PSF fork.we have a long ballancespring to soften the first 111mm of travel.

With very high or low pressures you need also a softer or stiffer ballancespring.

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The 14 have a new style mid Piston!

It' just a larger version of the 12 piston .

( 3 port)

The 12 Piston does not fit!!!!

"12 28mm

"14 32mm

Yes, you need a different valving also but at first i would set the spring correctly.

 

You are totally correct!  I just had one apart yesterday and sure enough it's a one piece three port design.

 

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