@suckolux: If your Kenmore was made after 1998, then it does have the single-stage motor, not the double-stage.
They first started using single-stage Ametek 5.7-inch motors in the mid-90's in their BOL or MOL canisters. These motors were VERY powerful- pulled about the same suction as their double-stage cousins; BUT to achieve it, they increased the 'resting' RPM that the motor runs at (this is when you are using the p/n or floor tool)- thus, putting more wear & tear on the armature & carbon brushes. It is RARE to see one of these single-stage Ametek motors make it past 10 years before dying. Then around 1997 or 1998, they started using Panasonic 5.7-inch motors in place of Ametek. When the first generation of Kenmore Whispertone's with HEPA filter came out, they started using a smaller diameter Ametek motor again, then they switched to Panasonic motors again (exact year I can't be certain- probably around 2005/2006). And just this year, I picked up a spare 'beater' 2009 Whispertone for parts (I have a 2001 model that I use for a 'regular' vac) and the motor was a Chinese motor- said "Sip Cinderson Motor Co, Ltd" on the motor; HOWEVER, this was a BOL model, so they may still be using Panasonic motors in the TOL canisters.
@powertank: Yes, you can get new brushrolls for the older Beater-Brush Kenmore p/n's. HOWEVER, they are not the original brushrolls with the beater & metal endcaps- they are the new-style Chevron brushroll with the plastic endcaps that we all know have been problematic. Thats why I suggested Nathaniel pick up a spare older p/n- because he would get the older brush, & plenty of spare parts he may need in the future- motor, nozzle neck, etc.
@eurekaprince Brian: If you maintain the HEPA filter by changing it yearly, that wouldn't have caused the motor to die prematurely by overheating. As a matter of fact, one REALLY disappointing thing about these Kenmores is that the HEPA is not sealed at all! Ever notice black dust surrounding the filter in the compartment?! Considering these canisters sell anywhere from $300-$650 CDN, thats something thats inexcuseable- especially when I can walk into my local vac shop & buy a new Riccar Pristine with a sealed HEPA filter, 100" waterlift suction power, swivel casters & wands/powerhead/tools that are just as nice as Kenmores all for only $699 CDN with a 7 year motor warranty!
My 2001 Kenmore Whispertone is very similar to your Kenmore Elegance, Brian- With Ametek motor, HEPA filter, hose, etc- But yours would have come with the newer-style p/n with wheels on the side, slightly different body style (Mine has the combo dusting/upholstery tool). I picked it up in 2007 to use as a 'regular' vacuum for $40 CDN from Value Village, so if the motor dies right now, it sure doesn't owe me anything!
As far as the Panasonic you recommended to Nataniel, I suspect it would use the Panasonic motor, not the Ametek or "Sip Cinderson" motor I was mentioning above. It is a lower-tier cousin to the vac-shop exclusive Performance Plus Platinum canister, so they would probably be smart enough not to cheep out on the motor.
And one thing you probably didn't know- aftermarket HEPA bags are available for the Kenmore HEPA bags in most vac shops. The ones I buy are 3/$9.95 at the local vac shop. They don't claim HEPA on them- instead they say 'high efficiency micro filter'- But they are cloth polypropylene bags & just as good as other HEPA bags for other vacs I own, such as my Kirbys. They probably just don't say HEPA to avoid legal problems. Sure beats paying 2/$16.97 at Sears.
Perhaps if you like, Brian, we could chat on the phone sometime, & next time I am in Toronto, have a mini-meet, as I do come down frequently. I'll email you privately.
Rob