asked this over at KTMTalk but didn't get a lot of responses. I am hoping to beef up the springs on my 02 Adventure both front and back. Specifically I am hoping to hear from others about what rate springs they went with. I am around 280 in street clothes and will be loading the bike down (even further for a 1500 mile ride here in about a month and a half so trying to keep from killing the ol girl. I emaild Race Tech; I have used their products before on other bikes but they said the don't carry what I need for the LC4. I'm also talking to a local suspension shop but he has not done a lot of 640's either so he suggested I try and get some feedback from others that have done this. C'mon, I know all of ya can't be running stock springs and I know I aint the only fatty (not naming names) riding a katoom 640
I'm with ya on this. I've dropped some weight so I am down to 280 LBs and have about another 90 pounds in panniers to carry. Stock shock is a 7.0 but the WP appearantly go up to 9.0 but, I'm not sure what weight rating that is.(stock is 165Lb rider!!) Its tuff being a big guy in a small mans world. People above 6'2" make up less than 2% of the population. Let me know what you find out and I'll do the same.
Sommer-KTM (Europe's biggest KTM dealer) recommends these spring rates at www.sommer-ktm.de for the fork: 3.8 N/mm Ideal for light off-road rider weighting less than 55kg/123lbs (Standard set-up in EXC 125/200) 4.0 N/mm For rider weighting less than 75kg/167lbs (EXC 250/300) 4.2 N/mm EXC 4 strokes, LC4 640 Enduro, SXC 625, SX 125 4.4 N/mm For SX with EXC model or for off-road rider over 95kg/211 lbs (SX 250, LC4 Adventure -2004, Super Moto 2004) 4.6 N/mm For touring with bags, riding with passenger or for supermoto (LC4 Adventure 640 2005, SM 625/640/660 2005) 4.8 N/mm Lot of luggage or Super Moto on streets (950, Rallye Replica 660) 5.0 N/mm Super Moto Sport (SM 640 2002/2003, SMC 660 2003) I went for 4.8, but I can't comment how they work. Springs have just arrived and are not yet installed. About the shock they say: 50/260 For light or small rider. 56/260 LC4 1993- 60/260 Competition 1994 63/260 SXC 635 2005 66/260 LC4 Enduro 2005 70/260 Supermoto 2005, Adventure 640 1997-2005 75/260 Rallye Dakar, Supermoto 2004 80/260 Lot of luggage. At the back I still have the original 70/260. I may change that later, but I am not sure.
Try talking to George at ESP in La Crescenta, CA. (818)951-9144. He did my 640 ADV and I am very pleased. He ordered a special spring (rear) and had to machine a spacer for it to work. I am 225lbs, but I am also a former desert racer and ride my 640 like it's a 525. He did wonders for it!
