any thing i should watch out for or any upgrades that it might need






If one needs a new input shaft or slipper, then it makes sense to update to B4 parts, namely for spur gear availability. But if your existing slipper is complete, there's no good reason to change it. I've hammered on them with some pretty potent brushless set-ups, no problems to date.I'd advise the b4 slipper setup(is the b5 setup the same?) if you're going brushless.
Sounds like something wasn't right there.when I first put that castle system in my b3 I could not set my slipper loose enough. any looser and the nut didn't have any meat left on the shaft thread to stay tight. I was pulling wheelies and completely breaking traction with just a tap of the trigger. it was also my first experience with brushless so I could have just not been used to it. but when I switched to the newer b4 slipper I helped quite a bit.
Sport systems aren't necessarily lacking in power. Castle stuff makes tons of power. What they are lacking is refinement; Castle just isn't as tunable or smooth as something like the Tekin RSX or Hobbywing Xerun V3.1, which are $200 ESCs.I was expecting the castle system to be more on the "sport" side of things and I was totally blown away by the power.
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