The S and SF model have different length chains.

2009 klx250s
SKU: 92057-1367
CHAIN,DRIVE,EK520LV-OX106L

2009 klx250sf
SKU: 92057-1472
CHAIN,DRIVE,EK520LV-OX104L

The SF seems to be 2 links shorter. Is that correct? Is the "520" # width?

How hard is it to just remove the links when needed? I see things for sale like "chain breaker" but I'm not sure if it's for our chains.

Someone mentioned that with a supermoto 14t, 39t setup on the S would require you to remove a link on the OEM S chain. The S and SF definitely have two different chains as seen in the above part descriptions.

What would you do? Add or remove links when needed? Buy a new chain altogether? Fudge it and just use the S model chain and try to adjust chain tension as much as you can when running the 39t sprocket?

I wish my wheels were here already. This is what happens when your bike is in the shop and you have nothing to ride...

 

I put a 106 link chain on my bike with the 39T rear, 14T front and it was almost too long. The adjusters are all the way back as far as they go. With the 15T front, it is better, but I also have the 331cc kit to make up for the bigger CS sprocket. I would just get another chain, and switch it with the wheels to be sure. I don't think there is a way to replace links in the factory chain once they are removed, but I could be wrong.

 

"The SF seems to be 2 links shorter. Is that correct?"

Sounds like it.

"Is the "520" # width? "

Yep, or size in general, its probably more complicated than straight width.

"How hard is it to just remove the links when needed? I see things for sale like "chain breaker" but I'm not sure if it's for our chains."

Easy, you can use a breaker if you want to push out a pin, or you can just grind off the pin heads & then take off the side plate.


"What would you do? Add or remove links when needed? Buy a new chain altogether? Fudge it and just use the S model chain and try to adjust chain tension as much as you can when running the 39t sprocket?"

Shorten & use the cheap OEM chain till it wore out then replace it with a good one. It wont take long.

 

So the 106 link will work, it's just not optimal at all. I think I just read that the OEM chain is not replaceable links. Thanks for your quick answers.

I found a Bikemaster cheap 520X104 "Roller Chain"

Is this the same as an O-ring?

EDIT: Oh and I'm not complaining about shipping time, just being completely impatient. Even if they came tomorrow I wouldn't have a bike to put em on!!

 

You can take links out easy but cant put them back unless you run alot of masters, so if you mean you want two different wheel sets with two different gearing combinations use 2 different chains.

FWIW Few things can end your day of riding. A cheap chain is one.

 

how long do the stock chains normally last, ill probally have to replace mine soon.

 

I am pretty sure my bike still had the stock chain after 26000 kms.

 

Easy answer is use 2 chains

 

+1 on that Mav.
I run one set up for off road. (13 JT front, 45 Renthal rear, Renthal R3 'o' ring chain.)
And the OE stuff for the slab (14/42 combo). Bike pulls 145kmh with this on the slab.

 

13/45 offroad
14/42 onroad might try 39 once i get things sorted out