Welcome! I have a very slow going similar project with a 650.

I would recommend that you find a Honda service manual for the bike. It
will have all the gear ratios you're asking for, as well as wiring
diagrams, suspension information, and other useful info.

What batteries are you planning to use? What voltage motor? Brushed,
brushless?

On Jul 6, 2017 05:45, <[email protected]> wrote:

Hi everyone,

I bought my first motorbike the other day, a 750s with a partially
disassembled (and probably broken?) motor.

I am a complete novice. I don't have a bike license yet, I've never even
sat on a motorbike before. Engines are black magic to me except the barest
basics. For example, I didn't even known until after I'd bought it that the
model numbers for bikes denote their CC displacement. Like I said, novice.
Electrical things I understand better.

Some have pointed out that it is quite big for a beginner bike, and quite
large for an electrical conversion. Oh well.

I've been keeping an eye out for a cheap donor bike to convert to
electrical on the cheap (junk forklift or golf kart parts) for light
commuting. But mostly, for a project.

I have a feeling what I'm doing is sacrilege to most of you, but, for
proper context, I got the bike for $20 total. Yes, $20... total. The reason
I picked this bike from all others in that 15 minutes of classifies
shopping is because... *it was $20 total*. It could have been any model or
style of any bike, I'd never heard of or been able to identify a Honda from
a Harley without reading the nameplate. I'm not a bike (or car) fan, I just
had an idea "I want to convert an old bike with a blown motor into an
electric bike" and then looked, and then found one being parted out. Jumped
right in. That said, I do love how it looks and feels.

The former owner tried to fix it up as a project bike but is old and
retired and has 3 other bikes and just wanted it gone, so he'd already
started parting it out. Exhaust and some other bits were already gone. So,
please don't bite my head off, I've already rescued it and I haven't a hope
of diagnosing or reassembling the motor. I can barely identify and count
which parts are cylinders.

I figured this is probably, if nothing else, different than what many of
you have seen before. So, hopefully I can trade progress pics for advice.
I'm pretty clueless.

My first question, so I can start to plan for a motor and batteries.. Any
idea how fast the tranny output range is, or the shaft:wheel RPM ratio, or,
anything for me to figure out the speed I'll need to turn the shaft? (I'll
probably throw away the motor and tranny and couple directly to the output
shaft if the numbers ballpark correctly. Electric motors have bottomless
torque, electric car conversions are usually started and left in 3rd gear).
If I have to keep the tranny, I imagine it's going to be a hell of a time
with a sawzall to cut off the motor side of things and find some way to
interface with however the motor spinning bits turn the transmission
spinning bits.

Here she is/was:

<https://lh3.googleusercontent.com/-1VoMMNJjwZI/WV3QfJENXyI/AAAAAAAAAAM/SCrOMmQWKpssFi4x9qLERfVs-eGzZVZ3wCLcBGAs/s1600/Nighthawk%2BPurchase%2B01.JPG>

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