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I recently got a bike with a Yamaha PW system. The bike computer has a light on/off button but the bike itself has no light and I want to add one. How do I do this? From what I understand, I need a light cable, some sort of crank pulling tool to open the motor, plus the light itself.

My question is where can I learn about the detailed procedure for doing this?

  • At that link there's no obvious detailed picture of the computer you mention. But I'd start looking there, at the switch. I very much doubt you need to open the motor itself or remove the cranks to access the electronics, though there may be an electronics housing nearby – Chris H Nov 15 '17 at 6:53
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    Its an add-on The keyword to google is "lupine" along with Yamaha pw ebike light. Be prepared for price shock - a front one costs twice as much as my road bike, and comes with no cable. Then you need a back light too! – Criggie Nov 15 '17 at 7:22
  • I don't think you need a special light, the hard part is figuring out where the connection is and its voltage. There are a lot of lights accepting wide range of voltages. It seems online for Yamaha PW system is hard to find. – kiwi Nov 15 '17 at 11:40
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Okay, so I did some research into this and here's what I found:

  • The Yamaha drive offers enough power for many, but not all, ebike lights to be connected. For example, Supernova M99 Pro won't work -- that's my favourite bike light. But lights like the Lupine SL S or Supernova M99 Pure work just fine.
  • To install the light, one needs to remove the protective plastic cover and undo two out of three bolts that connect the motor to the frame.

So I've ordered the light and the Light Cable to connect it to.

Update: did the entire installation process, here are the approximate steps I had to take.

  • Step 1: remove motor cover. Also the step where I get unpleasanly surprised that the bottom plastic motor cover has a hole in it. I wonder what idiot thought of that... this is where all the dirt and mud will accumulate. This is insane. Reminder to self: tape it over. Haven't seen this level of insanity from Bosch.
  • Step 2: unscrew two out of 3 motor bolts, loosen the third... also the step where I realize that those bolts are tightened with 22Nm of force. I did not, do not, nor will I ever own any instrument with a hex key that can apply 22Nm of force. This seems excessive and downright cruel and no, Bosch does not do anything as evil. Consequence: had to improvise a long handle for a hex key. Pretty sure I did not tighten it back to 22Nm, but I don't care. It's not going to fall off.
  • Step 3: connect Bosch LightCable to the motor (there's no ambiguity regarding the port or direction) and run it to the handlebar. This was also annoying because Haibike has these black plastic plugs where the wires came out and naturally, there's no space for extra light wire. Had to clip away some plastic.
  • Step 4: connecting wire to Luping SL S light... where I found out that Lupine does not mark the type of screwdriver you need for opening up the light. Furthermore, I watched their video where they suggested a Torx T5, so I ordered one, waited two days only to find that the light actually opens with a T6. Insanity! Also, they ignored my support request :( and when a manufacturer does that, well, they get blacklisted in my book.

To sum things up: the process of light installation is rather annoying, but manageable.

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    When you get it all working, do please come back and expand this answer to tell everyone how it went. You can also mark this answer as accepted because its what worked for you. – Criggie Nov 16 '17 at 3:53
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    @Criggie done!! – Dmitri Nesteruk Nov 29 '17 at 20:46
  • Well that 22Nm is tricky as my torque wrench starts at 30Nm.. yes it is for automobile use. Hopefully you did not tighten those screws with excessive force as they are attached to aluminium and you probably end up destroying your frame... otherwise took me less than 20min to do this. And plastic clip for two wires shoud be purchased beforehand... – user44937 Aug 17 at 17:30
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What you're describing is totally possible, but I don't think its very practical. I suggest you buy a standard set of rechargeable bike lights from your local bike shop, or online. Installation should be pretty self-explanatory. You just strap them to your handlebars, and charge them in once a week.

I personally use this light from NR.

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    Agreed - I'd rather run the main battery out of power and still have lights to pedal home by, and not run out of power for everything. Then again one of each type light is not overkill either. – Criggie Nov 15 '17 at 7:16
  • Rechargeable lights are not an option. Bike lights don't draw that much power - I have a Supernova M99 Pro on my other ebike always-on, I don't even notice the power draw. – Dmitri Nesteruk Nov 15 '17 at 9:10
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    @DmitriNesteruk additional Rechargeable lights are always an option. There's nothing wrong with independent redundant lights. – Criggie Nov 15 '17 at 19:29
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    @Criggie it's the very act of having to recharge them when they are dead that's infuriating. you can remember to charge the bike and forget to charge the lights – Dmitri Nesteruk Nov 15 '17 at 21:15
  • Well I did it, so it's not impossible. – Dmitri Nesteruk Dec 6 '17 at 11:29

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