SZZS specific CEF50-main thread (initial builds and troubleshooting related only)

[voigtkampff]

its the subtle movement with the cranks back and forth and I hear a small rattle. Every single cable and housing is cloth taped (rear triangle) or with proper insulative guides (front triangle). Not doing ICR so its even quiter, but there's that rattle when going downhill that comes 100% from the motor, like between engaging points between cranks/shaft

yes, this happens to me as well, also when pedaling without puting high torque on the cranks, "chasing the engine" with pedals. greasing the engine didn't affect this behavior. i suspect this is the large unidirectional needle bearing on the main shaft, rollers resonating mechanically on the border of their engagement, but I don't know for sure. adding shimano clutch grease to this bearing didn't help

 

[stuff]

yes, this happens to me as well, also when pedaling without puting high torque on the cranks, "chasing the engine" with pedals. greasing the engine didn't affect this behavior. i suspect this is the large unidirectional needle bearing on the main shaft, rollers resonating mechanically on the border of their engagement, but I don't know for sure. adding shimano clutch grease to this bearing didn't help

I thought about adding dt swiss ratchet grease to reduce noise on this bearing, but i'm not sure. Will try and let you know

 

[Kiwi_Stu]

Hi all, my frame has arrived and I've got all the cable routing done but for mounting the rear brake I'm finding standard bolts don't want to go more than a few turns in before they get really hard to screw in. I don't want to damage the inserts in the frame so has anyone else struck this issue and how did you solve it? Do SZZS use a different thread pitch vs standard brake bolts since they seem to have other custom sizing (eg shock and linkage bolts)?

 

[voigtkampff]

Hi all, my frame has arrived and I've got all the cable routing done but for mounting the rear brake I'm finding standard bolts don't want to go more than a few turns in before they get really hard to screw in. I don't want to damage the inserts in the frame so has anyone else struck this issue and how did you solve it? Do SZZS use a different thread pitch vs standard brake bolts since they seem to have other custom sizing (eg shock and linkage bolts)?

they use a standard M6 thread. i guess there might be a resin residue blocking the threads, try removing, scraping it with a pick or thread tap. if that’s resin, there should be no/very little metal shavings

 

[lkdoido]

Hi all, my frame has arrived and I've got all the cable routing done but for mounting the rear brake I'm finding standard bolts don't want to go more than a few turns in before they get really hard to screw in. I don't want to damage the inserts in the frame so has anyone else struck this issue and how did you solve it? Do SZZS use a different thread pitch vs standard brake bolts since they seem to have other custom sizing (eg shock and linkage bolts)?

I have two CEF 50 and CEF 55 frames. I use Shimano MT420 and IIIPro-E4 brakes, both with 180mm discs. I had shorter bolts in my toolbox.

 

[Tai999]

Can someone help me, I’m almost finished building my Cef50. I just need to install my rear shocks and that’s it. The problem is that when my bike is on the bike stand and I try to used the pedal assist to see if it work. It doesn’t work but when I use the walk mode, It works.

 

[mike_kelly]

Your cadence sensor must be installed and your rear wheel must move to use pedal assist. So if you don't have the chain on it will not move.

 

[Tai999]

wheel, chain, magnet on the rear rotor and cadence sensor is installed on the rear.

 

[Kiwi_Stu]

wheel, chain, magnet on the rear rotor and cadence sensor is installed on the rear.

Have you adjusted the angle of the cadence sensor? I had a similar issue after initial assembly, the sensor wasn't reading speed then I noticed that when the factory had taped up the sensor to the frame (to protect it) the angle meant it was too far from the magnet to read

 

[patdam]

Can someone help me, I’m almost finished building my Cef50. I just need to install my rear shocks and that’s it. The problem is that when my bike is on the bike stand and I try to used the pedal assist to see if it work. It doesn’t work but when I use the walk mode, It works.

The motor assist don't functioning with the rear wheel in the air. Crank arms torque needed

 

[Kiwi_Stu]

And to enable some torque on the cranks while the bike is in a stand just use a strong rubber band on the rear brake lever to create a bit of brake force while turning the cranks

 

[mike_kelly]

wheel, chain, magnet on the rear rotor and cadence sensor is installed on the rear.

Does the display show a speed as you spin the rear wheel by hand?

 

[Tai999]

Does the display show a speed as you spin the rear wheel by hand?

Yes it does.

 

[stuff]

Yes it does.

then its just a matter of applying torque/force on the cranks

 

[Tai999]

then its just a matter of applying torque/force on the cranks

Thank you, I will try.

 

[Tai999]

then its just a matter of applying torque/force on the cranks

I applied the rear brake while I move the pedal by hand and still pedal assist doesn’t activate. The cadence on the lcd screen does go up. Im thinking about taking the battery out to see if there is a loose connection but I really don’t want to do that.

 

[patdam]

I applied the rear brake while I move the pedal by hand and still pedal assist doesn’t activate. The cadence on the lcd screen does go up. Im thinking about taking the battery out to see if there is a loose connection but I really don’t want to do that.

personally i will tried first to ride it outside with the 2 wheels on ground. But you do as you want

 

[Tai999]

True, I’m being too impatient since I can’t ride it yet until I get the spacer for my rear shocks. Guess I have to wait

 

[mike_kelly]

Don't do anything else until you can actually ride it.

 

[Ger@nio63]

Hi guys, I disassembled and greased the Bafang M820 motor. I reassembled the motor and it gives me error 21. Before disassembling it, everything was fine. I have a doubt. Since I disconnected the controller wires, I was wondering if I need to calibrate it.
Has anyone already done this job and encountered this problem?

 

[voigtkampff]

Hi guys, I disassembled and greased the Bafang M820 motor. I reassembled the motor and it gives me error 21. Before disassembling it, everything was fine. I have a doubt. Since I disconnected the controller wires, I was wondering if I need to calibrate it.
Has anyone already done this job and encountered this problem?

Error 21 means engine is not receiving speed sensor signal. Check speed sensor cable connection, verify you connected the cable from sensor port to engine mainboard securely.

 

[mike_kelly]

Error 21 means engine is not receiving speed sensor signal. Check speed sensor cable connection, verify you connected the cable from sensor port to engine mainboard securely.

Or that you might have tugged on the speed sensor cable and rotated it so it now does not align with the magnet.

 

[Ger@nio63]

I solved it, it was a bent pin, I assembled everything and tried it, now it works without any errors, here are some photos of the engine before and after the work.

 

[kaaskopf]

now thats proper lubrication right there

 

[Ger@nio63]

the engine had 5,800 km done in 13 months I noticed the maintenance light on the display and I proceeded with the inspection the plastic gears were perfect as well as the metal ones do it yourself always pays off at any time you disassemble and repair this thanks to the online community that posted how to do it.

 

[Kiwi_Stu]

I solved it, it was a bent pin, I assembled everything and tried it, now it works without any errors, here are some photos of the engine before and after the work.View attachment 178685View attachment 178686View attachment 178687

Nice work, what grease did you use? Cheers

 

[Ger@nio63]

Bel lavoro, che grasso hai usato? Saluti

MOBIL SHC 100

 

[Robyracing84]

Hi, i’m Roberto from Italy. That’s mine! Bought at the end of novembre 25, arrived in middle march 26. It’s 22 kg

 

[Herculesridesebikes]

Sad day for me and my CEF50, noticed some cracks in the rear triangle and linkage. I thought it may have just been a crack in the paint, so I lightly sanded it to get a better look. Hope no one else has the same issue. I believe my frame is still under warranty, so hopefully SZZS can work out a solution.

 

[Robyracing84]

Sad day for me and my CEF50, noticed some cracks in the rear triangle and linkage. I thought it may have just been a crack in the paint, so I lightly sanded it to get a better look. Hope no one else has the same issue. I believe my frame is still under warranty, so hopefully SZZS can work out a solution. View attachment 180524View attachment 180525View attachment 180526

Any news? Have you bought it from Jean?