Sachs fork springs crossover
 

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.

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.

Going to .50 on it, but thanks.

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...

Are you recommending the 43.5 x 461 in the Eibach book?

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