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Old 05-18-2005, 01:26 AM   #1
Buckster OP
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Question 640 Adv stiffer rear spring/forks

Have the "80" rated rear spring on the Adv now, back wheel feels much more "planted" now, still have to tweak up for sag but at standard pre-load it is feeling better for my 200lbs 6'4" frame.

Some of the front end vagueness at speed has gone away to, money permitting, it will be time to sort the forks next. Should I just up the springs or do I drop them over to WP UK for a re-valve?

Any suggestions?
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Old 05-18-2005, 06:32 AM   #2
transalper
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Where did you get your rear spring? KTM says it has the 75 for $190 US, but I can't find another source.
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Old 05-18-2005, 10:45 AM   #3
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Factory Connection and Mx-Tech are both WP dealers. You shouldn't have to pay more than $130 for a WP rear spring. FC prolly has them on the shelf.
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Old 05-18-2005, 10:54 AM   #4
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Quote:
Originally Posted by Stobie
Factory Connection and Mx-Tech are both WP dealers. You shouldn't have to pay more than $130 for a WP rear spring. FC prolly has them on the shelf.
Thanks for the link Stobie!

The WP fork springs are $110.01 (a penny - ) - not bad at'all. but putting em in appears to be a biatch! Bet the revalving tain't easy neither...

The WP shock spring is $119.95 - again very nice prices.
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Old 05-18-2005, 11:46 AM   #5
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Quote:
Originally Posted by Stobie
Factory Connection and Mx-Tech are both WP dealers. You shouldn't have to pay more than $130 for a WP rear spring. FC prolly has them on the shelf.
Thanks again Stobie! The mx-tech link has a local shop in Livermore, CA

http://www.imotoracing.com/index.htm
anyone have any experiece with these fellas?

Fork Servicing: $90/pair plus parts
Shock Servicing: $90 plus parts

MX-Tech treatment (revalve/respring?) $245 per end...

Nice suspension setup diatribe here:
http://www.mx-tech.com/tuning_offroad.asp
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meat popsicle screwed with this post 05-18-2005 at 12:19 PM
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Old 05-18-2005, 01:06 PM   #6
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My forks are in pieces on top of my workbench right now. Revalving isn't a big deal if you know what changes to make to the shim stack. Disassembly was really pretty easy.

Proper fork springs have been harder to come by than the shock spring. I tried Brad Lowe's Racing, but ended up with the wrong springs for both ends, mostly because the LC4's (especially the Adv) are the Rodney Dangerfields of the KTM world. I bought Cugino Pegaso's 80/260 rear spring, and just ordered some fork springs from Mx-Tech.

The problem with sourcing fork springs is that, even though our bikes use the same basic 4860 WP fork as the '03 and '04 EXC/MXC's, it's set up internally for a 43mm x 485mm spring, instead of the 43mm x 510 mm spring of the RFS bikes, and it's not just a swap of preload spacers. The 510's won't fit without way too much preload being put on them. The one's Mx-Tech has on the shelf are 495mm, and there is plenty of room for that. I just hope the wire diameter isn't too large.

So Meaty, go ahead, dive in, do your own respring/revalve. The only special tool needed is an inch-pound torque wrench, and I'm thinkin' I 'member you got that covered.

If you really want to be a tightwad, and have access to a torch and bench grinder, you can stiffen your own springs without spending a dime. But you can only go to about .48 kg/mm. I wanted .50's, and you can't cut the stockers enough to get there without reaching coil bind (coil bind bad). The rear spring would be a PITA because of the powder coating, and the need to machine a spacer.

Oh yeah, you'd prolly have to spend $10 on shims.
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Old 05-18-2005, 02:24 PM   #7
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Quote:
Originally Posted by Stobie
My forks are in pieces on top of my workbench right now. Revalving isn't a big deal if you know what changes to make to the shim stack. Disassembly was really pretty easy.

Proper fork springs have been harder to come by than the shock spring. I tried Brad Lowe's Racing, but ended up with the wrong springs for both ends, mostly because the LC4's (especially the Adv) are the Rodney Dangerfields of the KTM world. I bought Cugino Pegaso's 80/260 rear spring, and just ordered some fork springs from Mx-Tech.

The problem with sourcing fork springs is that, even though our bikes use the same basic 4860 WP fork as the '03 and '04 EXC/MXC's, it's set up internally for a 43mm x 485mm spring, instead of the 43mm x 510 mm spring of the RFS bikes, and it's not just a swap of preload spacers. The 510's won't fit without way too much preload being put on them. The one's Mx-Tech has on the shelf are 495mm, and there is plenty of room for that. I just hope the wire diameter isn't too large.

So Meaty, go ahead, dive in, do your own respring/revalve. The only special tool needed is an inch-pound torque wrench, and I'm thinkin' I 'member you got that covered.

If you really want to be a tightwad, and have access to a torch and bench grinder, you can stiffen your own springs without spending a dime. But you can only go to about .48 kg/mm. I wanted .50's, and you can't cut the stockers enough to get there without reaching coil bind (coil bind bad). The rear spring would be a PITA because of the powder coating, and the need to machine a spacer.

Oh yeah, you'd prolly have to spend $10 on shims.
thanks for the vote of confidence; the disassembly instructions seemed daunting...

what about all those fancy tools they specify - custom stuff for the WP forks only? Vise-Grips?

torque wrench? funny you should ask... this JUST showed up with the mailman:


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Old 05-18-2005, 07:59 PM   #8
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Quote:
Originally Posted by Stobie
The problem with sourcing fork springs is that, even though our bikes use the same basic 4860 WP fork as the '03 and '04 EXC/MXC's, it's set up internally for a 43mm x 485mm spring, instead of the 43mm x 510 mm spring of the RFS bikes, and it's not just a swap of preload spacers. The 510's won't fit without way too much preload being put on them. The one's Mx-Tech has on the shelf are 495mm, and there is plenty of room for that. I just hope the wire diameter isn't too large.
I put a pair of .46 springs in, I ordered from Enduro Engineering and didn't notice the difference. They seem to be working ok, so I'm not going to take them out.
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Old 05-18-2005, 01:21 PM   #9
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Quote:
Originally Posted by Stobie
Factory Connection and Mx-Tech are both WP dealers. You shouldn't have to pay more than $130 for a WP rear spring. FC prolly has them on the shelf.
Thanks for the link. You're my hero!
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Old 05-18-2005, 01:00 PM   #10
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Quote:
Originally Posted by transalper
Where did you get your rear spring? KTM says it has the 75 for $190 US, but I can't find another source.
I got it from the WP agent here in the U.K., it cost about $120 U.S.
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