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  1. Zephak

    Giant Lafree middrive motor possible replacement

    @Amberwolf the explanation of the throttle wiring led to the answer: the throttle that was shipped with the controller had the connectors in the incorrect places. The connection was supposed to be plug and play, which is what I wanted to eliminate mis-wiring it. But the black ground on the...
  2. Zephak

    Giant Lafree middrive motor possible replacement

    Here's the link Yoidesu 24v / 36v / 48v 500W... https://www.amazon.com/dp/B07WFRXPJH?ref=ppx_pop_mob_ap_share I wired the new throttle And tried the OEM throttle. Curiously, the old one, when tried, caused the motor to turn something internally and drew 7watts, but didn't turn the sprocket...
  3. Zephak

    Giant Lafree middrive motor possible replacement

    By putting a 15amp switch on the negative pole of the motor, I was able to run the motor and check the wattage of the motor with no load. It measured about 76 watts. So, it seems like there's a bad throttle or controller, right? The controller was rated for 500 watts.
  4. Zephak

    Giant Lafree middrive motor possible replacement

    I bought a 24v brushed motor controller, a yk31c 500w, got it hooked up with the included throttle and a watt meter just after the sla battery , 25.6v and wired the "lock" wires together, but no joy. It took me a while to get back to this project and it would be great if the bike can run again...
  5. Zephak

    Giant Lafree middrive motor possible replacement

    Here are some pics of the board after a light brushing and air:
  6. Zephak

    Giant Lafree middrive motor possible replacement

    Here's a pic of the backside I haven't traced out a board before. What is the proper cleaner to use? Perhaps electrical contact cleaner? The bike exhibits a low voltage condition. With about 25.7 volts, when turning the bike "on", it will beep twice and all five LEDs will flash at about one...
  7. Zephak

    Giant Lafree middrive motor possible replacement

    The problem with the bike appears to be the part of the oem controller that sits in the bottom of the battery box. Picture attached. I have two questions Is there a Giant Lafree dealer that someone can recommend for finding a new circuit board? Giant hasn't returned an answer to my inquiry...
  8. Zephak

    Giant Lafree middrive motor possible replacement

    I'm searching for that new controller and I'm wondering if I could get some help on knowing what wattage the current motor is. I've read that some people think it's a "big honking motor" and one site says it is a 400w https://www.taipeitimes.com/News/bizfocus/archives/2000/03/06/0000026848...
  9. Zephak

    Giant Lafree middrive motor possible replacement

    Would a Electric Bike DC 24V 500W Brush Speed Controller For ATV Scooter Razor E300 E325, like in the attached picture work? Where would the throttle connect? On the derailleur port??
  10. Zephak

    Giant Lafree middrive motor possible replacement

    Maybe just install a big, red, easy button... momentary contact for on, normally off. How much voltage do you reckon that LaFree motor can handle?
  11. Zephak

    Giant Lafree middrive motor possible replacement

    The thought was too get a more modern replacement, and it sure is possible for the motor to be part of the frame's structural integrity But, new twist Now, As @Hillhater suggested, I put jumpers from the SLA (25.2v) Directly to the motor terminals and the motor ran! So, what to do now? New...
  12. Zephak

    Giant Lafree middrive motor possible replacement

    @hillhater I checked the thread you linked to but didn't see specifics about the motor... I'll keep looking, thanks!
  13. Zephak

    Giant Lafree middrive motor possible replacement

    I purchased a controller already and then I realized that this is a brushed motor and the controller won't work with this motor. A replacement to the 24v sealed lead acid seems pretty straightforward, maybe higher voltage, or perhaps 8s7p. The 2p sealed lead acid has the proper voltage but...
  14. Zephak

    Giant Lafree middrive motor possible replacement

    Here's the other side of the crank...
  15. Zephak

    Giant Lafree middrive motor possible replacement

    here's the bike...motor and crank is attached with three bolts to the frame; the battery is behind the seatpost, the controller is above the motor. Thanks for looking. I searched the forum and didn't find a motor mounted like this one.
  16. Zephak

    Giant Lafree middrive motor possible replacement

    https://youtu.be/IDOnakBCj5w On this older Giant Lafree, I'm considering the possibility a new middrive motor. The bike currently isn't operable as an ebike. My guess is that the brushes in this brushed motor could be the problem. Replacing the motor and using new electronics might be a way...
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