Which fork? WP5060 50mm or WP 43mm usd?

Queen of Spades · 02-03-2013, 07:17 PM

Have a line on a set of 43mm USD forks off of a 2003 LC4 640e. Currently using the massive 50mm conventionals, but I"m finding a hard time locating heavier springs for these. Thinking I may have more options with the newer USD fork.

Is the upgrade worth the headache? Will I lose much performance wise?

Navin · 02-03-2013, 08:54 PM

Try Cannon Racecraft for custom springs.

Shouldn't be hard to get them. I've converted a few older KTMs to 48mm forks, you may need to weld steering stop threaded rod to the frame, might need new caliper too. The 50mm forks are very smooth, I had decent 43s on a 2002 520 but the 50mm were smoother IMO.

http://www.cannonracecraft.com/

Queen of Spades · 02-04-2013, 04:10 AM

Quote:

Originally Posted by Navin

Try Cannon Racecraft for custom springs.

Shouldn't be hard to get them. I've converted a few older KTMs to 48mm forks, you may need to weld steering stop threaded rod to the frame, might need new caliper too. The 50mm forks are very smooth, I had decent 43s on a 2002 520 but the 50mm were smoother IMO.

http://www.cannonracecraft.com/

Thanks, I do see a listing for the 99 with 50mm forks.

Queen of Spades · 02-04-2013, 04:18 AM

As a side, Slavens Racing carries shock springs for older KTM LC4's http://www.slavensracing.com/shop/sh...-ktm-620625640

Queen of Spades · 02-04-2013, 06:27 AM

Cross reference: http://www.advrider.com/forums/showthread.php?t=72205

Navin · 02-04-2013, 08:03 AM

DS1434 username at ktmtalk is awesome for KTM suspension and really affordable too. His shop is Protune Suspension in Oh. PM me if you want to use me as a reference.

Queen of Spades · 02-04-2013, 08:07 AM

Thanks - I think I need to focus on getting the springs dialed before looking at revalving. I cannot find the stock spring rates anywhere for this bike.

bmwktmbill · 02-04-2013, 09:43 PM

Cannon can test your old ones for rate and sell you what you need, did it for me on the fork springs if I remember correctly.
bill

rz35027 · 02-08-2013, 11:09 PM

KYB Twin chamber fork springs are a very close fit, you may have to cut the black plastic spacer to the appropriate length, or use ABS pipe...

05-07 450 Yamaha
06-07 KXF 450

The 450's have .47 rate springs.

02-03-2013, 07:17 PM	#1
Queen of Spades ^OP tall drink of water Joined: Mar 2009 Location: Decatur, GA Oddometer: 362	Which fork? WP5060 50mm or WP 43mm usd? Have a line on a set of 43mm USD forks off of a 2003 LC4 640e. Currently using the massive 50mm conventionals, but I"m finding a hard time locating heavier springs for these. Thinking I may have more options with the newer USD fork. Is the upgrade worth the headache? Will I lose much performance wise? __________________ '99 KTM 640 LC4 Enduro http://www.youtube.com/watch?v=Vl7XlZs2CRc (May 2013 trail riding) '02 Kawasaki KX250 L4 http://www.youtube.com/watch?v=Sjgw-yZJdfs (Jan 2013 gopro )

02-04-2013, 04:18 AM	#4
Queen of Spades ^OP tall drink of water Joined: Mar 2009 Location: Decatur, GA Oddometer: 362	As a side, Slavens Racing carries shock springs for older KTM LC4's http://www.slavensracing.com/shop/sh...-ktm-620625640 __________________ '99 KTM 640 LC4 Enduro http://www.youtube.com/watch?v=Vl7XlZs2CRc (May 2013 trail riding) '02 Kawasaki KX250 L4 http://www.youtube.com/watch?v=Sjgw-yZJdfs (Jan 2013 gopro )

02-04-2013, 06:27 AM	#5
Queen of Spades ^OP tall drink of water Joined: Mar 2009 Location: Decatur, GA Oddometer: 362	Cross reference: http://www.advrider.com/forums/showthread.php?t=72205 __________________ '99 KTM 640 LC4 Enduro http://www.youtube.com/watch?v=Vl7XlZs2CRc (May 2013 trail riding) '02 Kawasaki KX250 L4 http://www.youtube.com/watch?v=Sjgw-yZJdfs (Jan 2013 gopro )

02-04-2013, 08:07 AM	#7
Queen of Spades ^OP tall drink of water Joined: Mar 2009 Location: Decatur, GA Oddometer: 362	Thanks - I think I need to focus on getting the springs dialed before looking at revalving. I cannot find the stock spring rates anywhere for this bike. __________________ '99 KTM 640 LC4 Enduro http://www.youtube.com/watch?v=Vl7XlZs2CRc (May 2013 trail riding) '02 Kawasaki KX250 L4 http://www.youtube.com/watch?v=Sjgw-yZJdfs (Jan 2013 gopro )

02-04-2013, 09:43 PM	#8
bmwktmbill Traveler Joined: Jul 2005 Location: Traveler Oddometer: 4,069	Cannon can test your old ones for rate and sell you what you need, did it for me on the fork springs if I remember correctly. bill __________________ '02 KTM 640 Adventure-lowered "On the road there are no special cases." Cormack McCarthy-The Crossing The faster it goes the faster it breaks. And high performance=high maintenance. Bill Shockley

02-03-2013, 08:54 PM	#2
Navin Unwounding Joined: Sep 2009 Location: Garage Oddometer: 4,420	Try Cannon Racecraft for custom springs. Shouldn't be hard to get them. I've converted a few older KTMs to 48mm forks, you may need to weld steering stop threaded rod to the frame, might need new caliper too. The 50mm forks are very smooth, I had decent 43s on a 2002 520 but the 50mm were smoother IMO. http://www.cannonracecraft.com/

02-04-2013, 08:03 AM	#6
Navin Unwounding Joined: Sep 2009 Location: Garage Oddometer: 4,420	DS1434 username at ktmtalk is awesome for KTM suspension and really affordable too. His shop is Protune Suspension in Oh. PM me if you want to use me as a reference.

02-08-2013, 11:09 PM	#9
rz35027 Gnarly Adventurer Joined: Dec 2007 Location: Vancouver BC Oddometer: 167	KYB Twin chamber fork springs are a very close fit, you may have to cut the black plastic spacer to the appropriate length, or use ABS pipe... 05-07 450 Yamaha 06-07 KXF 450 The 450's have .47 rate springs.

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