Any help would be appreciated! I have fought a front end push on my bike since I bought it. When I go into a turn and get back on the throttle the front end always wants slide out. It doesn't push as bad if I stay back on the seat but  I don't feel like I have as much control. The more forward I move the worse it gets. I am happy with my suspension and it feels good every where on the track but the exit of flatter turns.

2008 YZ450
Triple clamps up 12 mm in clamps
.50 fork springs (I just went from .48 to .50 and I like the .50 much better but the push was the same on both the .48 and .50's)
102 mm rear sag
MX51 front and rear 12 PSI
Running SPI DDT Gen 2 and I can post my set up if necessary.

Thanks

Drop the forks down to 10mm's.....

doc

How heavy are you, and what kind of front tire you using, is it new?

Edited by originalmonk, 29 May 2012 - 07:39 AM.

I had the same problem and managed to stop the front wheel sliding by turning the rebound adjusters in a few clicks. They must be on the bottom of your kayaba forks.

Do you feel the forks "wobbling" when cornering?

Edited by TommyZ, 29 May 2012 - 07:41 AM.

shockdoc, on 29 May 2012 - 07:28 AM, said:

Ok, Ill try it.  Thanks

originalmonk, on 29 May 2012 - 07:38 AM, said:

210 lbs without gear and its a brand new MX51 12 psi

TommyZ, on 29 May 2012 - 07:38 AM, said:

No wobbling feeling at all.

MX51 is half your problem....

I love the mx51 apart from on hardpack where its not intended for anyway

mog, on 29 May 2012 - 01:55 PM, said:

I dont think this is a tire problem because if I keep my weight back a little the front tire digs in fine.

If you like the suspension everywhere else and the problem gets better if you sit farther back then consider this... change the geometry as if you were sitting farther back and just test the theory.  Lower the sag to 108 to 110mm, lower the forks to 4 to 6 mm above the clamps.  Basically that would simulate you sitting farther back on the seat yet allow you to be in a good attack position where you want to be.

I sounds to me like the front end may be pushing out and not sliding out.  Pushing in the front is usually caused by front too low (rebound too slow, forks too high in the clamps, springs too soft, rear end too high and so on)   Basically the front wheel is trying to turn a tighter radius than the track is capable of holding.  You compensate by sitting farther back and slacking the front end so it will not try to turn so sharp.

tpars121, on 29 May 2012 - 07:13 AM, said:

You wanna go a little softer on the compression and maybe a little more rebound(1-2 clicks) your forks shouldnt be up all the way at 12mm either.
good luck!

kx450f63, on 30 May 2012 - 05:00 AM, said:

MX28, on 31 May 2012 - 11:26 AM, said:

Thanks, I want to make slow adjustments so I think I'll try moving the forks to 9MM up and two clicks on the rebound to start with.

Edited by tpars121, 31 May 2012 - 01:02 PM.

You've gotten some very good suggestions so just remember to try one thing at a time and if it doesn't work you might want to put it back to where it was before you try the next thing.  If none of it works then you'll need a combination of changes.  Keep a log book and write down your changes.  I personally would go out 3 clicks on the rebound, that will cause it to bite in sooner around the corner.  It is such an easy thing to change it makes sense to me to start there.  If that doesn't help I would work on fork height/sag.

As for the MX51 that tire gets very mixed reviews.  IMO it is bad on hard pack and bad in the wet.  Loose dry dirt it is pretty good.  When the 756 was discontinued I tried a couple and didn't like them.  First switched to the MX31 on front, and have since moved to the M403.  Your terrain, riding style, bike, and preferences may be different but that was my opinion.

LOL,  Your fork springs are way too heavy for your weight for one.  Even for MX / SX in my opinion.  Check your sag numbers front and rear.  Static and rider sags.  These will help pick the correct springs for your bike and your weight.  Too stiff a fork spring my feel good when going through whoops but really suck on flat turns.  MX racers have berms to help with turns.  Offroad riders rarely do.  In anycase you do want the front to drop when you enter a turn so the front end will bite.  Actually with the correct springs the entire bike will settle or rather squat when it goes into a turn.  I wouldn't think you need more than a .44kg spring.  I weighed 180lbs naked and when I rode KTM 530EXC I only used a .42kg spring.  A .44kg felt good in whoops but the bike wouldn't turn worth a crap.  I went back to the stock .42kg and was much happier.  Currently I am racing a WR125 / 150 Husqvarna that came with a .42kg fork spring and had to go down to a .40kg to get the correct sag numbers.  I had to go up 5 sizes on rear spring (1kg) to get the correct sags.  You probably need to go up on the rear spring also.  Many MX bikes run too stiff front and too light in rear.

Edited by Dwight_Rudder, 03 June 2012 - 10:32 PM.

Isn't pushing caused by too LITTLE rebound damping?  If you are tucking you have too much because the fork isn't rebounding quick enough.  When you turn and the front end pushes or just plows you may want to turn the fork rebound in 2 turns and see if it helps the fork stay down for a split second and bite for the turn....especially with big springs in front to control.

Ditch the MX51 front. I am having the same issues with my bike. I raised the fork tubes into the tripple, played with clickers, and I still get the front end push. I learned that the MX51 front is known to push and is complete garbage. I have a set of 403/404's on the way. Shoot me a message in a week and I will let you know if that solved the problem.

You guys ITS NOT THE TIRE.
If your suspension and form are right you can run a bald tire honestly.
Just bring your manual to the track and focus on the problem. Theres a good setting, they wont sell an ill-handling bike i promise

The MX51 front is a flawed tire, its no good on hardpack and very unpredictable.   I would start with a different front tire then play with the clickers if your not happy.   I dislocated my hip when the front washed out on a corner last week.  I have M403/404 on the way but I'll be out of commission for about a month.  I'm not blaming it soley on the MX51, but I'll never run it again.

Its a soft to inter Tyre and should not really be used on hardpack

mog, on 04 June 2012 - 08:00 AM, said:

An intermediate tire is going to see some hardpack as well as soft terrain conditions, its just not an overall good predictable tire.  I'm not sure why your defending it, unless you soley ride wet, tacky soil, it is garbage.

While it isn't likely his only problem IMO I've got to admit I don't like the MX51 at all.  Only place I've had it work OK is loose dry dirt.  I went from only buying Dunlop tires to switching to Bridgestone because of that tire.