Thanks for all of that and I think i understand most of it..

I did get the Spur, being the 102t Black Tamiya spur and then realised it doesnt fit with the 22t pinion as the pinon's teeth are too chuncky and wide for the finer teeth of the spur.. hense going for the new 29t pinion.

Damn Modelsport for selling me a 13.5t motor!! it is confusing to begin though as alot of american web forums indicate alot of drifters runing anything from 5.5 to 10.5motors (which in agreement with you doesnt make sense) but yet some others are suggesting the 17t to 21t motors.. ahh well i will have to live with what i have now as I dont have a limitless budget... I guess i could buy an eurgle drift assist to make my drifting more fun untill I get a 17.5t brushless system. (who says cheating isnt fun too hehe)

How does the spur with more finer teeth lower power output?

Cheers ( have you ever thought about starting your own blog/magazine because you clearly know your stuff)