[NSRCA-discussion] Hacker Comp overheating

[Stuart Chale]

I have a hacker 14XL Comp model that started overheating this weekend. 
I was hoping it just needed some grease.  Pulled it apart tonight and 
grease was still present (black as usual.  Regreasing time was near.)  
Cleaned it up and pulled the front housing off.  First thing I noticed 
was that the bottom portion of the fan (the phenolic disk) was missing.  
Some dust in the motor so I think it just got chewed up spit out or part 
of it ground to dust.  Pulled the rotor and the magnet looks fine.  I 
had a standard model where the magnet split part way down and was 
pulling higher amps.  Bearings fit the shaft freely, no play but slid on 
easily and seemed smooth.  Put it back together regreased.  Ran it up 
with a 21 x 13W APC pulled 67 amps 2300 watts at WOT but after a minute 
or so of 3 15 to 20 second full throttle bursts the motor was hot 
again.  Too hot to hold your hand around it.

Any ideas?
Thanks,
Stuart