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Buell 1125R/CR stator and Rotor repair

12-1-2015 - Buell 1125R/CR stator and Rotor repair

This article will be written to help customers out to analyze and repair there Buell 1125R/CR stator and Rotor. IT IS NOT FINISHED YET.


The point for the worries about the nut coming loose, which actually is a problem cuased by the splines having too much play, cause the rotor can move under extreme acceleration and deceleration.


EBR has experienced under racing conditions that it came loose and advices customers to tighten the nut to a whopping 400 NM of Torque.

In our own Buell 1125R racer who did raced in the super stock 1000 cup ( our little local AMA class ) we have not experienced this ourself.

But we take EBR's experience very serious, so we advise customers to tight the nut to the 400 NM of Torque.


In our opinion a better solution would be to fill the splines with a filler type Loctite to fill the play on the splines, ensuring the rotor would not move anymore,

but this will have an effect on servicing the bike as pullers and heat guns would be needed to pull off the rotor when needed.

As these pullers are very rare under our customers, and if used wrong or the magnets can break, we don't advice to do this.

Instead we advice to use Loctite 272 for the rotor nut. As Buell reviced the manual to this

see below for the revised thightening procedure for the crank nut

Installation 1125 Rotor / Nut  ( update tightening procedure )

Note Crank Locking tool is already in position
1.     Match the double tooth spline on the crankshaft with the gap in splines.
        in the rotor hub and slide the flywheel hub onto the crankshaft
2.    Press the flywheel onto the starter gear.
3.    Rotate the starter gear and the freewheeling gear until the teeth mesh
4.    Clean the threads of the crankshaft and crankshaft nut ( ALWAYS USE A NEW NUT ) with brake cleaner

Note Where LOCTIDE 272 ( red ) is unavailable , Use LOCTIDE 278 ( red )
5.    Install the flywheel nut
a.     Apply LOCTITE 272 ( red )  to the threads and the mating face off the crankshaft nut.
b.    Tighten to 285 NM ( 210 ft-lbs )
c.    Back off the nut counter clockwise approximately 720 degrees
d.    Tighten to 285 NM ( 210 ft- lbs )
e.    Back off the nut counter clockwise approximately 720 degrees
f.    Final tighten to 400 NM ( 295 ft-lbs )

6.    Remove the crank shaft locking tool
7.    Install the plug and tighten to 15 Nm ( 11 ft-lbs )