Need to play w/rear hi-speed comp after spring change?
Posted February 26, 2005 - 05:41 PM
I have an 04 wr450, and I changed the rear spring to a 5.8Kg about 3 weeks ago. Huge difference in handling, although some of it is due to the Mich S-12s I put on at the same time. My question is about shock adjustment changes after the spring change. I followed the manual and reduced lo-speed compression by 2 clicks, and increased rebound by 2 clicks. Eventually went another click lighter on the lo-speed compression for feel. I am getting a sense of 'bucking' on lipped jumps and I wondered if I should change the hi-speed compression a click softer. Any advice?
Posted February 26, 2005 - 10:08 PM
Posted February 26, 2005 - 10:33 PM
Posted February 27, 2005 - 04:10 AM
Posted February 27, 2005 - 07:39 PM
Make sure you got your SAG set at 100mm and verify your free SAG (18mm to 32mm) you can learn this of the DVD on this forum. YOu probably also need to increase fornt fork springs then,... not? The high speed has no CLICKS but turns. Set the hi speed at 1.5 turns out and first figure out low speed. Next you play with the high speed on some jumps, okay
Posted February 27, 2005 - 08:19 PM
I also put a much heavier spring on my 03 WR450, I'm about 200lbs. I also went to .47 fork springs. Big improvement. It sounds like you need more rebound dampening. I had to add 4 clicks total and its still a bit light, but i prefer it that way. When dialing my clickers in I followed the procedure on the Fineline Suspension DVD. They had me adjusting things in a different order from what I ever had before. It worked great. I recommend the DVD.
Posted February 27, 2005 - 10:36 PM
Posted February 28, 2005 - 06:54 AM
I got my rear spring from my Yamaha Dealer for something like $80. I selected the spring rate from the Tuning section at the back of my owners/repair manual. It has some usful advice on what spring to select and how to tell if you need one. It gives starting points for setting the clickers with the optional springs. You can also get springs from any good suspension shop.
Posted March 06, 2005 - 12:02 AM
To answer the above questions:
- Got the spring via Thumpertalk. It is a Racetech and I forget how much it was, sorry. Check the site.
- I changed the spring because I weigh about 230 all geared up and with my tools on in the fanny pack. The manual says the stock spring is targeted to about 176 lbs. I couldn't get the right geometry even after sag adjustments.
- Front is OK right now although the midstroke is a bit harsh.
I learned most of this stuff from here on TT, including the high approval rating of Michelin S-12's front and rear, free mods and spring stuff. Great site.
Posted March 06, 2005 - 08:55 PM
I ride with VERY light HS compression damping since lots of my riding is in loose rocks, and steep sandy hills with........you guessed it............loose rocks. I pay a slight penalty in deep whoops, but it's worth it where I ride.
Posted March 08, 2005 - 11:02 PM
I'm still finding the front a bit harsh in the stutter and braking bumps. Searching for the magic combo there. Tips anyone?
Posted March 09, 2005 - 06:03 AM
Posted March 09, 2005 - 06:18 AM
I agree with increasing the high speed compression for this reason: The deeper the compression intop the stroke the more the rear will kick. By adjusting the Hi speed compression, you keep the rear wheel from moving through as much stroke and the rebound will not kick as much.
The problem with trying to get rid of kick with slow speed compression is the ride gets more and more harsh in the slow stuff, but there still isn't enough rebound dampening to control that much spring force.
I would go stiffer on High speed an eighth of a turn at a time until the kick gets better.
Posted March 09, 2005 - 09:28 AM
Posted March 09, 2005 - 10:22 AM
When I hit square edges at speed the rear kicks too much. I have clicked up the rebound until it is stupid stiff. I figured the solution must be somewhere else.
If I hit these edges quicky and hard wouldn't the high speed compression control how far into the stroke the shock goes, and then also limit the amount of shock rebound.
My problem lies in big sharp hits that compress the rear shock so far into the stroke that it rebounds a long way and causes the kick.
If I limit the big fast movement, wouldn't that limit the rebound?
Posted March 09, 2005 - 08:19 PM
-the rebound only controls how fast the suspension extends after being compressed.
-the slow speed damping controls compression of the suspension under large impacts, i.e. landing from jumps or larger bumps like g-outs and whoops
-the high speed damping controls compression of the suspension from smaller and sharper jolts, i.e. rocks, tree roots, braking and acceleration bumps and those ever pesky rain ruts.
if the rear of the bike is kicking after you hit an obstacle like a tree root or square edged bump then you can adjust two things to fix it. the rebound may need to be slowed down so the suspension doesnt extend back as quickly. the second thing would be high speed damping, you would soften this up to allow the suspension to compress more readily thereby soaking up the impact this will work the same for the shock and the fork. if you're having the same trouble with the fork your front wheel wont kick but it will deflect to one side or the other, so if the handlebars tend to snap to one side or the other when going through choppy sections you will need to do the same type of adjustment to the fork