Bad noise 750w kit

[bost]

Hello,

I bought recently a 750w kit.

I've tested it with the wheel in the air and everything works fine.

But when I 've tested it on the road, it makes a very bad noise. It seems the noise appear when the motor is in charge.
If I release the motor with electric brake, noise disappear.

How can avoid this noise ?

[e-lmer]

If possible you may want to record the noise
and upload it so we can hear.

I suspect that you are hearing the motor trying
to do more than  750 Watts of work, and if so you
may be damaging it if you go too far.

If it is something else we can probably hear and
tell you.

Elmer

[Bikemad]

Stefano, I'm assuming your motor is a Magic Pie, if so, how does the noise from your motor sound, compared to Gary's sound test and my sound test?

Alan
 

[bost]

I 've heard the sound recorded by Gary and Bikemad. It's not the same.
With no load, my motor does a "normal" sound. The wrong noise appear only if the motor is on load.
My kit is not not a magic-pie, it is a pro-kit 902.  I assume that the controller make its job to ensure that the motor don't fails.
I 've posted a video on this link http://www.youtube.com/watch?v=MUzV7zBS02A. Sorry for quality's video.
I 've posted another vider where the sounds is great. http://www.youtube.com/watch?v=tkGiIU2ODho

Stefano.

[bost]

Nobody has listened my video ?

[MonkeyMagic]

Nobody has listened my video ?

Hey bost hows it going

I listened to your video, can you tell us what you have stuck on your spokes? It looks large and metallic.

If you watch this video you will see the sound occurs when the object passes the right rear dropout (opposite the chainstay)

What is that thing?

It sounds like the sound is external (not inside the motor) And does not sound motor related, unless the magnets were out of true and somehow rubbed I'm trying to work out what else it could be.

When I first build a Magic Pie bike I could not work out what the "clanging" sound was coming from my bike!!! It sounded much worse than your video, turns out it was the long valve sticking out of my tyre tube hitting on the chainstay !!!! Haha

Anyways I am curious what is stuck on your spokes, I'm tipping if you remove that the sound will magically disappear

[bost]

Hi MonkeyMagic,

Thanks to you to be interested by my problem.
On the spoke, you can see the magnet for the speed computer. In this video, you related, for me the sound is good. It' on the other video that the sounds is not good ans seems to com 'lle inside the motor.
I' ll try to record another video whith best quality so you can see what is wrong.

Stefano.

[bost]

Hello,

I've posted other videos :
http://www.youtube.com/watch?v=X8LSt7W6DgU
http://www.youtube.com/watch?v=MsVNQDD6-CA
Sound is normal but you can hear a wrong noise : a high-pitched noise of friction.
What do you think about it ?

Stefano.