Sachs fork springs crossover

I

IDAHOSPUD

New member
I want to put in heavier fork springs in my 09 ec300. Sachs 48. What is the crossover spring size for sachs. some say, 05 yz450f, and indeed those springs match the dimensions very close.

race tech shows:
FRSP 444650 RT FRK SPR 44.0x460mm .50kg Length=460mm outside diameter=44.0mm

FRSP 444750 RT FRK SPR 43.6x472mm .50kg Length=472mm outside diameter=43.6mm (this is the yz450f spring)

The stock Sachs Spring is 43.3 O.D. x 460 mm long.
 
I use the 4447 with my 2011 forks, the stock preload was essentially zero, 12 mm is a bit more than the magic 10 mm people quote for shocks, but forks are a longer spring. It feels quite normal and fits perfect, between years there seems to be differences in the fork caps.
 
IDAHOSPUD said:
I want to put in heavier fork springs in my 09 ec300. Sachs 48. What is the crossover spring size for sachs. some say, 05 yz450f, and indeed those springs match the dimensions very close.

race tech shows:
FRSP 444650 RT FRK SPR 44.0x460mm .50kg Length=460mm outside diameter=44.0mm

FRSP 444750 RT FRK SPR 43.6x472mm .50kg Length=472mm outside diameter=43.6mm (this is the yz450f spring)

The stock Sachs Spring is 43.3 O.D. x 460 mm long.
Click to expand...

How much heavier? Are you trying to go all the way to 0.50?
I have a set of 0.44s for sale that have about 6 hours on them.
 
We usually keep the proper fork springs in stock at the shop so we don't have to worry about mixing and matching, but once I get into the shop this morning I'll see what info I can get.

RaceTech isn't the only spring source...
 
Just a follow up- I figure you've already got what you needed- were you looking to see what was available for your bike or looking for something you could take out of something else you had laying around and fit to your bike?

What I'm getting at is that both of the companies I get springs from (Cannon and Eibach) have proper solutions for the fork- springs are about $110 for the fork-

Hope that helps...
 
That is the spring I put in some Sachs 48's last week- but it has about as much preload as the stocker- so not much. They've got another one that's 11mm longer, but that might be a little much. I think it's easier to make a spacer to play with preload...

Playing with valving on that same 48 tomorrow. We made up some special tools to properly take the cart apart and leave the hydraulic bottoming resistor in place. I love stuff off the CNC machine! :) Looks *SO*cool!
 
I changed the oil in mine the other night. Very easy fork to service and no problem getting to the mid valve with out special tools. Had to make the 10 point for the top of the fork though.
 
@ gasgas surely your 6 days has the marzochi forks? Otherwise you have a secret on the sachs access to Mv that others struggle with
 
I have the Euro/Canadian bike with Sachs forks. The large tube that houses the mid valve just unscrews from the 4 pronged spring seat thinger. Lightly clamp the 4 pronged thinger in the vise and use a screw driver through the holes in the end of the tube to turn it. I'm sure there is a fancy tool to accomplish the same task.
 
Odd, isn't it? Someone in this thread said they had to make a 10 point tool another had a 4 point jobbie- the cart we had was a 6 point with a 33mm OD on the cart.

I've taken forks apart using the holes before- scares the crap out of me. Way too easy to make it out of round.

We made the 33mm aluminum vice jaws to clamp the cart and the proper (for what we had to work on) 6 point tool.

(Editing because the photo is monstrous in size)

Ok, just check out the page on the site... http://www.stmsuspension.com/photos/
 
Last edited:
Thanks will check out the pics

As for the ten pointer for the fork caps, why not just use the 19mm that houses the rebound clicker? (remember to loosen the top trippleclamp before trying to loosen the fork caps!)
 
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