I run a reedy sensorless that comes with the b4.1 rtr. The only time i get juddering is pulling up to the start line slowly.
Ive had 2 different motors in it And its the same on both. Dont think its a sensorless issue, probably just a set up thing but i prefer to keep things simple. Less wires less hassle!
Before shelling out for another combo i would borrow someone elses sensorless speedo to make sure you dont just need another esc
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