[Aufitt]

Remove the sprocket cover with 8mm Socket.

Remove the two sprocket bolts and retaining plate with a 10mm.

Remove the sprocket.

 

[Aufitt]

Check that your sprocket is the correct one.

Renthal makes a 13T & 14T (XR250) that fits the the cbr.

Measures up the same thickness and fits the spline.

 

[Aufitt]

Anti-Seize is your friend when working on motorcycles, so lube the Output shaft, retaining plate and bolts.

Slip the sprocket into the chain.

Put the sprocket onto the shaft.
Install the retaining plate then turn it to where the bolts line up,
You may need to rotate it 180 degrees because the 2 bolt holes have a different PCD.

 

[Aufitt]

Tighten the bolts and re fit the sprocket cover.
Refer to page 63-65 of the owners manual for adjusting the chain, but make it 30-35mm slack in the the lower half of the chain midway between the sprockets.

Before (14T sprocket.)

After (13T sprocket)

Moved it exactly one mark.

 

[sendler]

Nice photos. The same procedure applies to fitting a 15T front sprocket with the additional step of trimming the nubs from the plastic sprocket cover so that the metal guard piece can be positioned all the way forward against the bolt holes to make sure it doesn't rub.

 

[BBRMotosports]

And what were the results? good, bad?

 

[Eaker605]

Thank you for the step by step. Ordering mine later this week. Looking forward to your review

 

[Rusty Shackleford]

Cool, man. How's the clearance of the chain on the swing arm afterwards? It sits pretty close with the 14T already. What are your thoughts on the issue? I'm doing the 13T swap this week.

 

[Aufitt]

Not an issue Rusty.

Before.

After.

 

[Rusty Shackleford]

Awesome. I can't wait. Hopefully I won't have time to consciously think "wow, I have time to think about watching the tach climb to redline at WOT" in 2nd gear as I'm watching the tach climb to redline at WOT. That, and achieving my goal of being able to say "way to get up that slight incline on the interstate without dropping speed or downshifting, little bike."

Anyhow, thanks to you guys here and the superbike shop where I live, I'll be making the switch with no hesitation.

 

[billyedtimmy]

Thanks for this, Aufitt! One ignorant question: Can I just use regular ole lithium grease instead of anti-seize, or does it matter?

 

[Aufitt]

Trolley jack with a piece of rubber under the linkage is an easy wheel lifting device if you dont have spools, just leave the bike on the sidestand.

 

[Aufitt]

To remove the std (heavy DID O'ring) chain

Carefully grind the pins down below the sideplates with a 4" grinder,
centrepunch the pins and the plate pops off.

 

[Aufitt]

 

[Aufitt]

Most 520 chains are 120 pins long, so shorten the new one to 108 pins to suit the cbr.

 

[Aufitt]

An easy way to put a new chain on is slip the new master link into the old chain.

And pull it through.

 

[Aufitt]

Install the new masterlink correctly.

 

[Aufitt]

Adjust the chain to 35mm slack measured between the sprockets MINIMUM.
Loose = Good, Tight = bad.

Turn the rear wheel 2-3 rotations of the chain while giving it a squirt of the good stuff.

 

[Eaker605]

After changing to a 13T front how much is the speedo off?

 

[sendler]

After changing to a 13T front how much is the speedo off?

6% higher than it was.