bafang spares

Electrically assisted bikes, trikes, etc.
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willcee
Posts: 1185
Joined: 14 Aug 2008, 11:30pm
Location: castleroe,co.derryUlster

bafang spares

Postby willcee » 19 Nov 2020, 3:13pm

Hemo et all.. anyone know where i can source locally in the UK spares for BSOB2 mid motor.. have a rythmic soft noise on pedal rotation not harsh or sqeaky..seems to come and go.. about 2.5 k on motor and its still going very well otherwise.. would strip and looksee and replace the known wear points.. anyone.. will

kwackers
Posts: 15250
Joined: 4 Jun 2008, 9:29pm
Location: Warrington

Re: bafang spares

Postby kwackers » 19 Nov 2020, 3:31pm

2.5k is nothing, mine had 30k on it before I stopped using it.
I doubt there's any wear in there at that.

I did have a noise that I think sounded similar, in my case it was just a dry oil seal (on the crank iirc). A quick wipe with grease on the lip fixed it.
Took about half an hour, just removed the side cover of the motor (still on the bike) checked everything was greased up, spread the grease around a bit and put it all back together and it was fine after that.
(There's a nylon pinion that requires a bit more stripping but from what you're saying it won't be that)


Not sure about spares in the UK, obviously there's eBay and various online sellers.

Trikesnbikes
Posts: 11
Joined: 1 Apr 2020, 3:37pm

Re: bafang spares

Postby Trikesnbikes » 20 Nov 2020, 4:10pm

Brighton ebikes carry some Bafang spares and provide fast service (I have no connection other than as a customer).

hemo
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Joined: 16 Nov 2017, 5:40pm
Location: West Sussex

Re: bafang spares

Postby hemo » 23 Nov 2020, 2:14pm

One obvious place to look is the drive side cover on the final drive, clean out if need be and repack with aeroshell 22 or equivalent grease.

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willcee
Posts: 1185
Joined: 14 Aug 2008, 11:30pm
Location: castleroe,co.derryUlster

Re: bafang spares

Postby willcee » 2 Dec 2020, 6:43pm

OK. none of the usual culprits were at issue in any manner.. the issue was caused by the loose fit of the rotor shaft fit in the motor casing.. the chap who found the problem is an experienced electrics electronics mechanic and reckoned Bafang had done this to save them assembly time.. in each other case he had experience of the outer edge bearing fit in the casing is interference with the rotor fit in the inner part of the same bearing being engineer fit therefore usually needing a puller..he had tried to remove this bearing and gave up before the casing shattered... he said that his opinion was they saved assembly time.. he cleaned everything, and used loctite bearing fit let it stand the 24hrs recommended, put it together and retested it .. in his words ''it was like a mouse chewing paper will''.. he bought it as well....happy camper...will