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Fork springs dimensions

  • Thread starter Thread starter razooki
  • Start date Start date
R

razooki

Guest
I just read in the manual that front spring length should be 421mm. I measured mine when I serviced the front forks and they are 500.5mm. I replaced the oil with 15w oil but I did not put any air in the forks and it still feels very soft. Are these springs Progressive? I thought they might be that is why I did not put any air in the forks.
 
In my 750, the stock springs were 2 piece. A shorter upper and then the long lower. The Progressives I replaced mine with were a one piece and roughly the length you stated. Hope that helps.
 
Hammered said:
In my 750, the stock springs were 2 piece. A shorter upper and then the long lower. The Progressives I replaced mine with were a one piece and roughly the length you stated. Hope that helps.
Click to expand...

But I thought the progressive springs were supposed to be stiffer than stock. When I'm straddling the bike and apply the front brakes the bike dives about 3" and I think that is way too soft. If they are indeed progressive spring I'd hate to cut them. Maybe I'll try some air in them or a piece of pipe but I had a hard time putting on the top as it is.
 
The 850 has a soft spring that looks almost identical to a progressive spring as it's progressive wound & 1 piece.

Either cut it or replace with progressive.

Dan :)
 
Dan, I was trying to figure out if I have the stock springs or progressives or springs from another GS. The manual indicates a much shorter length for the springs (421mm stock vs. 500.5mm on mine) and I would hate to cut mine if they are indeed Progressive springs.

Raz
 
progressive springs are wound with closer coils on one end and factory ones usually are not. And they sometimes require a spacer. You can check their website for setup info for your forks
 
It's not so much a matter of how much it dives when you try pushing down on the forks, it's a matter of how much is sags when you put your weight on it. The difference between fully extended and loaded with your weight should not exceed 20-25% of the total travel. Most of our bikes have about 6 inches of fork travel, so you only want the front to sag about 1 to 1.5 inches. Adjust your preload with PVC pipe spacers to get that correct ride height.

.
 
Steve said:
It's not so much a matter of how much it dives when you try pushing down on the forks, it's a matter of how much is sags when you put your weight on it. The difference between fully extended and loaded with your weight should not exceed 20-25% of the total travel. Most of our bikes have about 6 inches of fork travel, so you only want the front to sag about 1 to 1.5 inches. Adjust your preload with PVC pipe spacers to get that correct ride height.

.
Click to expand...


I'll try that I just hope that I can actually compress the springs and the pipe in order to screw in the top caps.
 
Did you try it with 10-15 psi? The bike really is made for that.
 
I don't run air in the 1000's with progressives. The 850 also has a progressively wound stock spring so you're right - it is hard to tell!

Try upping the preload first, if you need to go much more than an inch above the top of the threads I would think about cutting some coils to stiffen the spring rate.

Dan :)
 
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