Probably poor mesh, or somethings not running square. (bent motorplate, dirt between the motor and the plate, gearbox tightened up on the squint, slipper shaft bearings not pressed home properly (or damaged)?)
My original spur lasted about 6 months, it only got trashed after i got some sand under the spur cover and got it wedged into the root of the tooth.
That one also ran with both massively under and over tightened slipper (doh!), and i also ran it with one of the over size gear diffs, to the point that the motor hit 130 degrees. Still no spur problems.
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