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Old 01-31-2009, 11:22 PM   #16
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A frustrating thread to read.

Its gone from no sensor wire and smoke, to a pinion and spur problem.
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Old 02-11-2009, 04:49 PM   #17
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ok jake i had the same problem. I installed a gtb with a 17.5 in my bk2 and went up 5 on my pinion(22) with the stock spur gear(78). It was the slowest buggy ever! I call my lhs and the told me that i needed an 76 spur with an 39 pinion and alot of people are running with 43 pinion! WOW so for me to install this combo i had to make the slots for the motor a little longer so it would fit.
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Old 02-11-2009, 06:37 PM   #18
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Sounds like it turned out to be a gearing issue... The 17.5 and stock 27t brushed motors are geared very very differently..

With a 27t off-road you typically gear from a 9 FDR to maybe 10ish... with a 17.5 you are looking at 5 to 6ish FDR depending on the track...

Brushless motors have to get up to speed before the power-band kicks in..

Have fun!

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