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Old 02-03-2013, 07:17 PM   #1
Queen of Spades OP
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Joined: Mar 2009
Location: Decatur, GA
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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?
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Old 02-03-2013, 08:54 PM   #2
Navin
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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/
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Old 02-04-2013, 04:10 AM   #3
Queen of Spades OP
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Quote:
Originally Posted by Navin View Post
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.
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Old 02-04-2013, 04:18 AM   #4
Queen of Spades OP
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As a side, Slavens Racing carries shock springs for older KTM LC4's http://www.slavensracing.com/shop/sh...-ktm-620625640
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Old 02-04-2013, 06:27 AM   #5
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Cross reference: http://www.advrider.com/forums/showthread.php?t=72205
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Old 02-04-2013, 08:03 AM   #6
Navin
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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.
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Old 02-04-2013, 08:07 AM   #7
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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.
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Old 02-04-2013, 09:43 PM   #8
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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
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Old 02-08-2013, 11:09 PM   #9
rz35027
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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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