Acceleration question: Maybe throttle, maybe not?

JoeS

New Member
Hey guys and gals,

I bought a used Watseka e-bike 36v 250w 9ah battery color is black.

Checked it out with a Romai controller tester and it showed it needed a new controller.
Tested motor and Hall Effects Sensorsthey tested as they should as well as did the main phase .
Tested new controller and it passed with flying colors.
Tested twist throttle shows to be work according to Ronai tester.
Battery shows 38.5v.

I replaced the controller hooked it up to battery.

Turned throttle all the way open and rear bike wheel turns but pulses, lets say ever second or second and a half.
if I back off on the throttle and slowly advance the throttle it will slowly pick up momentum and I can then s l o w l y advance the throttle and the motor will pick up speed till the motor reaches top speed.
Once back tire is spinning at a good rate I can go on and off throttle no pulsing no hesitation.

If it was an old school car I'd say it has a sticky choke or maybe trying to vapor lock or weak fuel pump but alas, it's electric and not a gas engine.

Wonder what is causing it to pulse when I open the throttle up to the maximum when starting out from a dead stop.
Why does it work if I slowly twist the throttle feathering the power from no throttle to max throttle?

Things that make me say hmmm?

Thanks

Joe in Florida.

 

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