Dahon Jetstream conversion

[Deleted member 4366]

Just in case, you should check that the phase wires aren't damaged fron the wheel twisting. That can make noises like that too.

 

[cwah]

Phase wires are ok...

I think I'm going to get a proper DD motor. Geared are too weak

 

[mountainsport]

Why is that?

Not even your back also pressure on your wrists.

MS.

 

[mountainsport]

I'll probably stick with 20" wheel even with bigger bike. Because I thrill acceleration

Its all a phase that the most of us go through, I know because ive been there. Soon you would want that thrill to meet you half way as in half the thrill and the other half in more comfort, reliability, endurance, efficiency and practicality . But in the mean time by all means enjoy yourself to the highest .

MS.

 

[cwah]

My main issue is space. I live in a tiny appartment... if I could I'd have got a much bigger bike!

 

[cwah]

Ially the bike runs quite well. No significant drag or power consumption....

Just the noise is annoying. It's like it rub against something constantly

 

[cwah]

I received my Sine wave controller and the instruction. Unfortunately I do not read chinese.

Anyone can help me?

My understanding from left to right:
1. ??
2-3-4: Phase sensor
5: Main positive
6: ?
7: Main negative
8: ?? Maybe speed control? There is 3V coming through on both of the wires
9: Hall sensors
10: Reverse
11: Reverse when connected
13: Throttle
14: Ignition
15: ?? Maybe high power brake? How do I use that?

Thanks

 

[cwah]

I'd like to have regen, I haven't figured out how to do that?

 

[patpatbut]

I received my Sine wave controller and the instruction. Unfortunately I do not read chinese.

Anyone can help me?

My understanding from left to right:
1. ??
2-3-4: Phase sensor
5: Main positive
6: ?
7: Main negative
8: ?? Maybe speed control? There is 3V coming through on both of the wires
9: Hall sensors
10: Reverse
11: Reverse when connected
13: Throttle
14: Ignition
15: ?? Maybe high power brake? How do I use that?

Thanks

U got most of them right

1. Speedometer wire
5. Main negative
6. Alarm signal
7. Main positive
8 3 speed control
11. Alarm main power
15. High brake...I think it is the brake cut out

Patt

 

[cwah]

Oh thanks do you read chinese?

Do you know how I can make the high brake work?

Thanks

 

[Deleted member 4366]

High brake is a wire at 0v that you pull up by switching it to a 5v wire. Low brake is a 5v wire that you pull down by switching it to ground.

 

[patpatbut]

Yes I do. It is quite handy especially you can get something really cheap in Chinese online market like taobao

 

[cwah]

I tried to put it on the 5v of my throttle and it killed my throttle! Now I have a non working throttle.

Hopefully I have a spare one, but to which 5v shall I plug that in?

And how do I make it work with the hidden brake with 3 wires?

 

[cwah]

Also the controller stops working when I put full throttle. It works again when I release it

 

[cwah]

my dahon front wheel hub is dying. Anyone knows where I can find another one at decent price? Or another front dahon wheel or 74mm front wheel

 

[jhruk]

Assuming your Jetstream has a 20 spoke QR front wheel I think this one is a direct replacement:

Kinetix 74mm Front Hub

They have a cheaper nutted one here:

Dahon 20 hole Nutted front hub

Complete wheels from £24.99 : Dahon wheels

If it's just the bearings gone you should be able to replace them. The Kinetix hub has cartridge bearings so you'd have to knock them out & measure them, I don't know the size.

 

[Deleted member 4366]

When you're using an unknown controller, you should connect the battery wires, then check every other wire with a meter. Some will have battery voltage and some will have 5v. You can't do ant damage with 5v, but if you connect a battery voltage one to anything, you can kill your controller, throttle or anything else.

The front hub is repairable. It's probably just the bearings that beed adjusting or replacing. You need to dismantle it to see what state it's in. You should be able to get the bits in a cycle shop.

You need to measure the voltage between the throttle black and signal wires while it's running to find out what's happening at the point it cuts off. Does the throttle signal disappear or does the controller only allow a maximum voltage?

Check that the voltage on the high-voltage throttle wire is zero, then when you connect it to any 5v wire with a switch, it'll cut the motor. A hidden wire brake sensor might work if you put it backwards so that the LED is on all the time, and goes off when you pull the brake, but I'm not sure .

 

[cwah]

Assuming your Jetstream has a 20 spoke QR front wheel I think this one is a direct replacement:

Kinetix 74mm Front Hub

They have a cheaper nutted one here:

Dahon 20 hole Nutted front hub

Complete wheels from £24.99 : Dahon wheels

If it's just the bearings gone you should be able to replace them. The Kinetix hub has cartridge bearings so you'd have to knock them out & measure them, I don't know the size.

I contacted the shop, they didn't answer me. So I decided to buy it cheap from Amazon:
http://www.amazon.co.uk/gp/product/B004QCO4TQ/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

I know it's 100mm dropout. So I'd have to force a bit the fork. I hope it won't be an issue

 

[cwah]

When you're using an unknown controller, you should connect the battery wires, then check every other wire with a meter. Some will have battery voltage and some will have 5v. You can't do ant damage with 5v, but if you connect a battery voltage one to anything, you can kill your controller, throttle or anything else.

The front hub is repairable. It's probably just the bearings that beed adjusting or replacing. You need to dismantle it to see what state it's in. You should be able to get the bits in a cycle shop.

You need to measure the voltage between the throttle black and signal wires while it's running to find out what's happening at the point it cuts off. Does the throttle signal disappear or does the controller only allow a maximum voltage?

Check that the voltage on the high-voltage throttle wire is zero, then when you connect it to any 5v wire with a switch, it'll cut the motor. A hidden wire brake sensor might work if you put it backwards so that the LED is on all the time, and goes off when you pull the brake, but I'm not sure .

Yes that what I've done, I've seen some wire at 80V (my battery voltage). Don't know what these are for. But yeah I'll be careful.

I was just surprised to have killed my throttle like this!


I'll do all of this at once when I'll receive my wheel. Should arrive quickly from amazon.

 

[cwah]

I've noticed my chain kept slipping from my single speed gear:

Any idea what's the reason?