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  1. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Just FYI... last year after the idiodic forum owners had their tech team misinterpret the context of google memo, and read the year wrong on it, they simultaneously upgraded every forum they own (hundreds, mostly automotive they'd been buying up over the years), and broke all of them. For months...
  2. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    I've never thought to search by Opel there. The white one with the black stripe is Charlie's, he's the one who actually finished his that I was talking about. The other 3 look like they were mostly just wishes. Nothing that anyone ever did much more than tear down and buy a motor for. The...
  3. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Hmm... Sanyo NCR20700A That's not an endorsement of them, beggars and choosers and all that. But it's what Dewalt uses. They're power-optimized cells, not energy-optimized. Skills are minimal. You tear apart cases, yank the cells into chains, peel off the positive side with pliers, cut off...
  4. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Nope, that's Flloyd's. There were some actual electric Opel GTs, out of factory I think, back in the day. Hideous things with wheel covers, and lead acid batteries up to and including in the passenger seat. One guy 10 years ago converted an Opel. It's the only one I've heard of. And then I...
  5. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    That's kind of you to say. Umm, story. TL;DR - It's been on a shelf for almost 2 years. Last I was working on it, the driveshaft fell out and it took me a while to figure out how it might go back together (springs, circlips that don't act as circlips, etc). I was also skeptical about how well...
  6. M

    Honda Ruckus conversion plans..

    I have one of these and I've been really happy with it: https://motorino.ca/motorino-xpd
  7. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Battery Bulk: My big goal was to get 60 miles (100km) worth of range at highway speeds. I need ~140-200 watt-hours to travel a mile at those speeds. I have these 4x5 battery holders, an 18650's average voltage through it's discharge curve is ~3.7, maybe 3.75v, cells are roughly 2000mah each...
  8. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Dafuq happened to your reply? Looks like it went down the garbage disposal and then the software tried to reassemble it back into a ham. :P
  9. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Controller Success!! I basically sat with my thumb up my butt for 3 weeks, figuring the controller was broken because it showed full voltage on the motor output without the keyswitch or the throttle even connected, indicating blown mosfets. And then I was bummed about my throttles all being...
  10. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Doing a little more research, I discover most e-bike throttles are not, in fact, potentiometers. They are instead, hall effect sensors based on a magnet, and some amplifier. So they output 0.8-3.8v or so. I'm not sure if this is compatible with my controller. The controller expects a 0-5,000...
  11. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    I bet you have a 1206mx. X is for SepEx. It has a PDS ("Precision Drive System" aka "speed control and sensors"), mine doesn't. (Oh, duh, says there right on your diagram, "1206mx controller"). I linked the manual in my previous post, after it gives my diagram it gives the PDS diagram where your...
  12. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Aha. It's actually an "EZ-Go" 25864G09 golf cart controller, which is a Curtis 1206-4301 (which is not written anywhere on it, you just have to know that). And for future people who may come across this thread: http://products.jacobsen.com/img/manuals/28646.pdf <-- Manual for the golf cart...
  13. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    I think I was unclear about that. The pump motor only charges the hydraulic system, which is only used when raising and lowering loads. And, it can easily more than keep up with full time use of such (I think for safety, if there's a slow leak, you better be able to keep the load lifted). This...
  14. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    John - Just a headsup, you've got a lot of confidence relative to how well you understand things. You seem to know a few things very well which has misled you into thinking you know all things. I don't think I'll take your advice. Far from "being eveything", "proper" gearing doesn't matter a...
  15. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    I think you mean 'fruitless', a planting effort that yields no food. 'Thankless' would be accomplishing a task that you receive no acknowledgement or recognition for. I'd be happy for the task to be thankless, as long as it beared fruit, but it doesn't even do that :p They'll be whatever...
  16. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    There is somewhere between 3:1 and 4:1 reduction in the rear shaft drive. That was one of the first things I checked. If you scroll up, it's in the 4th post, starts off with "Transmission". Bike original redlined at 11,000 rpm at 125miles per hour.
  17. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Hey, long time no see. Thanks, but the guy who sent me the smashed up cowling was kind enough to trace and outline the shape of the original windshield. I doubt anything else would fit, it's got some pretty heavy 90' folds in it. I'll buy some polycarbonate and bend it myself, cheaper than...
  18. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Batteries: Of the major expense: 1 - Bike. 2 - Motor. 3 - Controller. 4 - Batteries. ... I got the first 2 nearly free, the 3rd... ehn, half assed. So just batteries now. This project sort of started when someone told me you can buy used starter batteries at the junkyard for $10/each and I...
  19. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Actual Mechanics/Motorbike Assembly: I don't know what I'm doing. I never took this bike apart, someone else did, I got a bin full of parts and hardware. Front stuff at the front, back stuff at the back, maybe? Sort bolts, numbers might help me figure out how stuff goes together? There...
  20. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Speed Control: This seems to be one of those places you can't cut corners, you gotta spend some monies. Supercheap Plan A: Size the battery voltage to whatever was roughly the right amount to travel highway speeds, so, just lock the throttle on with a contactor and good enough. Then use...
  21. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Motor Coupler: The motor has to couple to the driveshaft, without a transmission. The advantages to shaft drive are: - Quieter than chain. (Nice for electric which is already quiet) - They don't tend to break or fall apart. (Nice for series wound DC motors, which, if a chain ever breaks, will...
  22. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Transmission: TL;DR - I decided I don't need one so it's gone. Ta da. Skip this if you don't care for details. The transmission shared oil with the engine, they're the the same assembly. I could have cut the engine off, but then I would also need to: - Plug all the oil ports. - Adapt the...
  23. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Motor: I first mocked it up with a treadmill motor to see if it would turn and how hard it was to get the orientation right. It was very difficult. That in itself almost made me give up, there seemed to be nowhere I could hold the motor that wasn't clunking the driveshaft around it's enclosure...
  24. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    The Bike: A 1985 Honda Nighthawk 750S. I chose it because it was the first cheap bike I found (paid $20 total, already had a failed rebuild of an engine and the guy wanted it gone). I would have bought literally any motorbike carcass for $20, but by coincidence I happen to actually really like...
  25. M

    Motorbike Conversion - 1985 Nighthawk 750S - From Junk

    Hey everyone, I got started here a few years back building a recumbent bicycle that I never quite finished (may still some day), but, with a new project. I'm maybe half-done a motorbike conversion. One of my favorite things about this forum is everyone's well-documented builds, so, I figured I'd...
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