Bafang M820 CEF50 carbon frame maintenance/repairs/replacement parts thread

[hamncheez]

First off, I love my CEF50:
View attachment CEF50-carbon.jpg
Of course this frame isn't perfect, headset routing sucks, I had to dremel a pit in the carbon to allow for the Cane Creek to fit, etc. However, the entire build including frame, motor, and battery is about $3k for me so thats not too bad, especially for a total build weight of exactly 42 pounds.

Anyways, with the other m820 and CEF50 threads getting over a hundred pages long, I thought I'd start a new one SPECIFICALLY FOR MAINTENANCE, REPAIRS, AND REPLACEMENT PARTS for this frame.

If you spend hours reading the other threads, there are several recurring problems the CEF50 has. They are:

• Headset creaking
• Bolts coming loose
• Cracking near the Horst link (rear) pivot on the chainstay, drive side

I've only encountered the first two. Anything else to be added?

 

[hamncheez]

Personally, I've had several bolts come loose- the motor mounts and the driveside rear chainstay pivot, which I lost this morning. Anyone know of how to get a replacement?

Don't neglect your thread locker!

 

[calvintys]

My m820 has a funny problem, just wonder if any encounter this before.

M820 sudden power lost n back again.

Yesterday my M820 suddenly power cut when cadence it's low during climb when I set to B. Then I rest for a while and test it again on flat surface , on B when I pedal at high cadence , my leg can feel the power was not as smooth as before, it's goes off or lost power a little and back again...

www.emtbforums.com

 

[un..inc]

I secured every bolt with threadlocker during buildup, and this is relatively secure...
The problem is: i destroyed the mounting-bolts for the shop...
Does someone have the exact measurements of those bolts?
Thanks!

 

[calvintys]

I secured every bolt with threadlocker during buildup, and this is relatively secure...
The problem is: i destroyed the mounting-bolts for the shop...
Does someone have the exact measurements of those bolts?
Thanks!

Which bolts are you referring? Pic will be great

 

[un..inc]

Which bolts are you referring? Pic will be great

Sure:

And in the meantime, I can see, why it was not obvious... I meant the bolts for the SHOCK - which should be clear - but I wrote the bolts for the SHOP...
Sorry for that...

Thank you all!

 

[calvintys]

Sure:
View attachment 147574
And in the meantime, I can see, why it was not obvious... I meant the bolts for the SHOCK - which should be clear - but I wrote the bolts for the SHOP...
Sorry for that...

Thank you all!

Contact Jean, she will sell you those shock bolts, if u lost the male bolts , just use your water bottle bolts, i lost my in trail and use water bottle until Jean send me a new bolt, it around 10usd. It's custom size , i try Google it but no luck.

 

[un..inc]

Contact Jean, she will sell you those shock bolts, if u lost the male bolts , just use your water bottle bolts, i lost my in trail and use water bottle until Jean send me a new bolt, it around 10usd

Thanks, I will contact her, but I fear, that the next bolts will be soft aluminium as well.
I would like to get bolts in titanium or steel...

 

[calvintys]

Second bolt

 

[un..inc]

Thank you!
BTW: I did not lose a part - I broke the Hex inside the bolt head...
So I will have to break it, to get it out...

 

[calvintys]

Thank you!
BTW: I did not lose a part - I broke the Hex inside the bolt head...
So I will have to break it, to get it out...

Have you took it's out yet? If not there is a special tool. Wait I find for it.

 

[un..inc]

Have you took it's out yet? If not there is a special tool. Wait I find for it.

A Drill?

 

[calvintys]

A Drill?

I use it to remove my crank n stem hex bolt which it's even harder.

 

[un..inc]

I think I'll go fot the AliExpress TI-Bolts...
Link to Ali TI Bolts

 

[davegonz2000]

Any leads on a 43V battery charger? Do they make them in higher amperage?

 

[Ger@nio63]

 

[Ger@nio63]

Hi, I found these on AliExpress

 

[Ger@nio63]

Ho appena trovato questo fantastico articolo su AliExpress. Dai un'occhiata! 4,35€| Kalosse M8X17-67MM bici ammortizzatore posteriore viti sospensione completa Mountain Bike bulloni acciaio al carbonio viti forti

Kalosse M8X17-67MM Bike Rear Shock Screws Full Suspension Mountain Bike Bolts Carbon Steel Strong Screws - AliExpress 18

Smarter Shopping, Better Living! Aliexpress.com

a.aliexpress.com

 

[Charlypitillo]

Hello, I have ordered a battery motor and a CEF 50 frame. I would like to know if this shock absorber is suitable for me. It says it is 210-50. The other measurement that is indicated on the geometry of the frame is 8* - 22.2. I also don't know if that measurement is the one that the shock absorber has.

 

[Imendiolea]

Hola, he pedido un motor de batería y un cuadro CEF 50. Me gustaría saber si este amortiguador me sirve. Pone que es 210-50. La otra medida que se indica en la geometría del cuadro es 8* - 22,2. Tampoco sé si esa medida es la que lleva el amortiguador.

View attachment 155583 View attachment 155588

Mensaje repetido en otros 2 hilos.

 

[Charlypitillo]

Mensaje repetido en otros 2 hilos.

Can't repeat messages? I'm just looking for help

 

[stellasuppa]

Can't repeat messages? I'm just looking for help

that shock will fit but you may need specific "hardware" its the grommits and bushings that sit inside the eyelets that go inside that 22.2 mm measurement.

 

[petkevich]

First off, I love my CEF50:
View attachment 139569
Of course this frame isn't perfect, headset routing sucks, I had to dremel a pit in the carbon to allow for the Cane Creek to fit, etc. However, the entire build including frame, motor, and battery is about $3k for me so thats not too bad, especially for a total build weight of exactly 42 pounds.

Anyways, with the other m820 and CEF50 threads getting over a hundred pages long, I thought I'd start a new one SPECIFICALLY FOR MAINTENANCE, REPAIRS, AND REPLACEMENT PARTS for this frame.

If you spend hours reading the other threads, there are several recurring problems the CEF50 has. They are:

• Headset creaking
• Bolts coming loose
• Cracking near the Horst link (rear) pivot on the chainstay, drive side

I've only encountered the first two. Anything else to be added?

my headset creaks so bad, cant really get it tight always has slop. Is it the bearings, or do I need a different headset as the one with the bike is not great. THoughts?

 

[stellasuppa]

my headset creaks so bad, cant really get it tight always has slop. Is it the bearings, or do I need a different headset as the one with the bike is not great. THoughts?

i decided to buy replacement top and bottom headset fittings cannot give you on any feedback because still working on the frame and i have a problem with my motor or controoler not being found by the besst tool. these are the ones i got.

 

[TommyR]

Coil spring folks, would you mind sharing what rate coil you're running along with your weight? I'm contemplating the switch and would like to get an idea on spring rate. Thanks!!