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I agree that the RCS remains an excellent ebike on or off road. I rode a 2018 model for about 2,000 miles, then switched to a Hyper Scorpio, and last summer added a 1,000W 2023 RCS Step, which now has about 1,000 miles. I've always set up R mode and a high max speed, but use them carefully...

I agree that it's disappointing to have a major fix at 2,000 miles, but will add that this specific problem seems quite rare as best I can tell from the various Juiced forums. As for the old motor, there's a young bike whiz in my neighborhood who may enjoy messing with it...

Happy to report that my HyperScorpion is running very well with the new rear wheel assembly. So it seems evident that the wacky speed readings and related issues -- even the mechanical sounding knocking with the replacement controller -- were all due to motor electrical issues, probably Hall...

PS: The HyperScorpion motor connector has 11 pins, by my count, and I suspect that one issue with the tester is figuring out which wire is which.

Thanks, PCeBiker. I think you're right about the Hall (speed) sensor but using that tester and then fixing sensors as necessary looks beyond my skill level. Also, Juiced gave me a slight discount and 30 day return option on a new HS rear wheel assembly. If it works right, it will be an expensive...

So I opened up the HyperScorpion motor and there's no visible damage to the gears or anything else. No corrosion either and still a reasonable amount of lubricant after 2,000 miles plus. The pins on the motor connector also look good but I guess the wacky speed readings problem could still be in...

Thanks, fabbrisd. In fact, now I've got the rear wheel off and plan to open up the motor as soon as I can get the FR-1.3 Freewheel Remover I think I need. Or do you know another way? BUT there's this: When I put the original controller back in, the knocking sound completely vanished. I even did...

Well, now Juiced tech support thinks the speed reading problem is in the rear hub and has offered to refund me for controller replacement. It's going to be interesting to see if swapping back to the old controller eliminates the terrible motor knocking sound.

Mystery problem! My HyperScorpion -- now 2,000 plus miles old and never crashed -- had an intermittent problem where the speed reading would jump around wildly and mess with peddle assist (unless I was in R mode). Juiced support suggested replacing the controller, which I did carefully last...