I agree with c0sie regards the slipper.. I had to adjust mine after switching to lipo 'n BL... Have you considered one of the Novak "light" motors? I run a 6.5 light in my B4 and can recommend it greatly... no more humungous wheelies and V.quick at full throttle!!!
Have you dropped the pinion size too? I went from a 21 to a 19 after the change... seemed strange to drop pinion size but the motor/speedo temps demanded it!
Have fun dude... you won't regret the change...
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