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XR400 Fork Springs, Are these right size

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I got some new springs for my 03 XR400 from XR's Only. I told them my weight (180 lbs) plus gear and pack about 200lbs. I just opened the new box and pulled my old springs. The new springs are at least an inch shorter, Is this correct?? They are Eibach EMS EI996.047.1, .47KG. I want to get these installed but I'm not going to use them if they are not correct, and XR's Only is closed on weekends so I can't get an answer from them. Any help would be appreciated.

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They should have a 36mm OD and be 470mm long.

But, as long as they are the right OD , you can add a bushing to give it the right preload.

It has been a while since I have done a set of the xr400 forks, but typicaly the aftermatrket guys where making there springs shorter than the OEM ones and you have to make a preload spacer to make it work out right.

Race Tech allways seemed to send the springs with a piece of stock in the box to make the preload spacer out of.

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Sorry I did not find this earlier. And this spacer can be made from PVC available from any hardware store as long as the od is correct. ! weigh 196 and have .44's. '47 sounds a little stiff to me. I would not add any extra preload length. Good luck, great bike.

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For a 196 lb rider) before gear) .50kg/mm spring woulkd work good for woods riding .

The XR is a heavy bike as well.

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For a 196 lb rider) before gear) .50kg/mm spring woulkd work good for woods riding .

The XR is a heavy bike as well.

.50Kg springs ????????? Are you nutz ? .42 or .44kg would be a much better choice. I ran .42kg on my KTM 525/530EXC and it worked great. I weigh 185 without gear. I ran stock springs in my XR400 (440). I think they were .42kg.

Dwight

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I beg to differ.

on my 96 XR 400, that I have long gotten rid of. I ran .50 up front an then I was @ 200lbs w/o gear when I played in the woods.

I only ran 8mm preload and ran 5w oil at 150mm oil height.

Must be my agressive MX roots shining thru.:bonk:

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i was 200 with gear 1-2 months ago and use .42kg/mm in my XR400 my static is 75mm spot on it turns great!!!

now 192 with gear...:bonk:

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.50Kg springs ????????? Are you nutz ? .42 or .44kg would be a much better choice. I ran .42kg on my KTM 525/530EXC and it worked great. I weigh 185 without gear. I ran stock springs in my XR400 (440). I think they were .42kg.

Dwight

An XR400 is unbalanced stock. A 0.46 spring balances an XR400 with the stock shock spring, both being perfect for a 200-210 pound rider. A 0.47 spring will be OK, but don't add more than 1/4" of preload. You'll need a spacer - use 1" pvc cut to length with a metal washer on both sides of the plastic.

JayC

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The problem with a XR400 is that it needs more than normal sag in rear. It needs 35% rider sag instead of the normal 34%. It needs 105mm rider sag or it shakes it's head. It needs 70mm rider sag in front. About 39-40mm static.

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The problem with a XR400 is that it needs more than normal sag in rear. It needs 35% rider sag instead of the normal 34%. It needs 105mm rider sag or it shakes it's head. It needs 70mm rider sag in front. About 39-40mm static.

I have my XR set up with stock rear spring and 0.46 front for my 210ish pounds. I set the front springs using about 3/4" preload to keep the front end up, and I run ~3 3/4" (~95mm) race sag. This gives my bike has between 20 and 25mm free sag in the rear - don't know the free sag or rider sag in front, but it has what feels like an ideal bias and is rock-solid stable - I've never once had headshake with it.

With the stock unbalanced setup, however, you are likely correct about the additional sag.

JayC

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Im looking into doing the springs on my bike, on the race tech site it says a 210lb person needs .517 springs but some of you guys say even .47 springs are to heavy. Is there anyone with .50 springs that can tell me how they go?

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