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Old 06-13-2014, 11:55 AM   #226
russbryant
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Joined: Dec 2003
Location: Tucson, AZ
Oddometer: 1,159
Here's a handy link for g/s and gs differences.

http://www.nebcom.com/noemi/moto/gsdiff.html


Russ
Tucson
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Old 10-17-2014, 06:12 PM   #227
_cy_
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Location: Tulsa, Oklahoma
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OT .. looking for a 21in stock front wheel from one of you folks that's done a conversion and now have a spare front 21in wheel laying around collecting dust.

please PM with details .. thanks and back to your regular program ..
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Old 02-25-2015, 07:00 AM   #228
azongo
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Using different WP48 USD fork Leg on a Bike!!

Hello dears,
I want to make a WP48 USD conversion on F650GS.
Unfortunately the ones I got are slightly different. The one with designation "WP 4860 MXMA 1418X728", I guess came from a KTM 640 LC4 adv
with 275mm wheel travel


And the second one with specification "WP4860MXMA 1418W710" after checking on Internet should come From a KTM 400/520 SX Racing
with 295mm wheel travel


So my question are:
1.It is safe to use this forks on teh 650GS After only swapping the spring ?
2.What mods I need to do to get this two parts and front wheel balanced after mounting?
3.Can I manage to increase the "WP 4860 MXMA 1418X728" fork travel up to 280mm with spacer and only adjust the "WP4860MXMA 1418W710" with spacer to,then ok?
4.Knowing that I don't have easy access to ktm used parts here in Burkina Faso/ Ouest Africa , please guide me to get this done.

Thanks
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Old 05-27-2015, 03:41 PM   #229
tututis
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Is it possible change the stem of ktm triple clamp by a custom machinist stem ?

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Old 05-27-2015, 04:51 PM   #230
Solo Lobo
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Yes, but the KTM triples will reduce steering lock due to less off-set
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Originally Posted by Stagehand
your bike is suitably dirty. Well done.
R65LazaruS
So I sold my GS and went shopping for a G/S!
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Old 05-27-2015, 09:51 PM   #231
tututis
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Which is the stock offset on ST?

less off-set ...will the turning radius be reduced? or does the bike more estable in straights?

How I can extract the stem? by heat?
How is assembled, by pressure?
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tututis screwed with this post 05-28-2015 at 02:31 AM
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Old 05-28-2015, 11:45 AM   #232
tututis
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Quote:
Originally Posted by Solo Lobo View Post
Yes, but the KTM triples will reduce steering lock due to less off-set
I have seen the bike and I understand.
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Old 05-28-2015, 12:41 PM   #233
Solo Lobo
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Quote:
Originally Posted by tututis View Post
Which is the stock offset on ST?

less off-set ...will the turning radius be reduced? or does the bike more estable in straights?

How I can extract the stem? by heat?
How is assembled, by pressure?
I think BMW is 32mm's, KTM is something like 18mm or 20mm


Use a big press to remove and reinstall the stem
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
R65LazaruS
So I sold my GS and went shopping for a G/S!
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Old Yesterday, 07:52 PM   #234
TennesseeJed
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A friend and I put WP 48s on our GSs this Spring. Rather than start a new thread I thought I would bump this one since it's a sort of a community WP fork topic.

My friend went the direction that most have in this thread. I went the cheap bastage, shade tree mechanic route.

My friend purchased triple clamps from Applied Racing and had a machinist CNC a custom center stem. KTM 690 forks. He's got a 21mm front axle KTM wheel and 300mm oversized rotor. I think the guy who did his center stem was the father of Jeff Emig the moto/supercross racer. He's online. I have no affiliation with him but he might still have the CNC program available. He's got gold valves and likes his .48 kg/mm spring.

I used these widely available 18-20mm KTM triples and had the center stem machined to make them work.



The center stem is modified by cutting off the offset nub at the top and then tapped for the 27mm (?) stem bolt. Then the stem is turned down to fit 27mm ID bearings. 27 x 52mm bearings are in the Temco catalog but you got to dig around to find them. Then the hole on the top clamp was carefully enlarged using an air grinder. Lastly, a small amount of material is removed from the bottom of the top clamp to clear the top bearing cover and increase the height of the center stem into the top clamp. Sure, I was gifted the forks and triple clamps, but it ended up costing $45 dollars to mount WP 48s on my R100GS.

My forks came off a 2006 250 SX which uses a 26mm axle. I thereafter squandered all of my cost saving by purchasing a 21 x 1.85 front wheel and hub and a 280mm front rotor that uses the stock reservoir.

Forks were shortened ~3 inches. I've still got the stock spring (.44 kg/mm) until gold valves arrive. Then I'll likely go to a spring between .48 and .52 and take an additional inch out of the travel.

One big downside of the new geometry is that about half of the turning radius goes away. Mostly just a hassle trying to turn in driveways and whatnot but its very noticeable. Riding at speed, however, not so much.
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