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You should do the Oxygen an honour and rename it David but others you meet won't understand why it is your super sub.

Undo the top stem bolt/screw a turn or two , then the two side screw bolts a turn or two it should then rotate. To align again straighten the bars tighten the stem top bolt/screw then the two side ones, before riding hold the front brake on and rock the bikes checking there is no play with the...

Once you disconnect the BMS it will be dead and of no use.

Did you try unbolting the caliper tie it up and see if the noise went away ? Also did you check the rotor wasn't rubbing the inside of the fork ? Watching the short video's we can only guess, it's so much harder when the bike is not in front of you to diagnose.

That was going to be my next question of what it is/does.

From the hub axle follow the motor cable it should lead to a connector about 12" away, pull it apart.

By the looks of it you need a 36v Hailong 1 battery. Check the thumb nails carefully and esp the rail dimensions to make sure the battery is an exact fit to match yours...

Not unless the controller is dual voltage model, most are for a certain voltage value. If you try without knowing you will 99% blow the controller.

I suspect there could be a few laid up Bosch bikes around Europe that no longer work that might be out of warranty, out of warranty owners can face quite a repair bill. Any bike in the eyes of an owner is to them worth a lot of money but in reality it is only of use for spares repairs and as a...

The hub is brushless we can see by the three phase wires, I have a feeling it is unsensored. Is there a motor connector along the rear stay of the bike ? If so pull it apart and take a pic of the connector and the pins inside. Also a pic of the cockpit/handle bars with display etc,etc.

Matching the battery might be awkward as there are so many different ones, pics would help. By far easier as the battery goes is to speak to Jimmy at ebikebatteries.co.uk to re- cell the existing case with better cells to give more capacity using nice 10a cells and maybe be able to fit more...

If it is a Hailong 1 base you need you might be able to swap out the oblong pin out block for the round one. https://www.aliexpress.com/item/4000189473190.html?spm=2114.12010612.8148356.51.41105c70IODCuD

Battery fuse ?

It's not a Hailong 2 either as they are a side off battery & base.

Battery pic from the top side.

Hailong commonly use a 4 pin connector which are rectangular shape and not round pins, though I have seen the five round pin connector type. Hailong and Polly case use this type of discharge connection. http://www.topbikekit.com/ebike-hailong-power-discharge-connector-male-or-female-p-745.html

Like your self many see the powerful options out there and add 2 +2 up and get 5, they get hood winked by the power quoted and price then compare them against dearer & lesser quoted power kits with often much better electronics. What isn't understood by most is that high power requires high...

The Revo shift is a good move imho, so much more friendlier to use then thumb selectors.

Seriously though even with a head of hair one will get sun stroke out in this weather, I wear a Lidl Bmx/ski type helmet or a Dudes helmet with a few air vents in the top. A thin skull cap/beanie can be warn under one or a bandana as already mentioned, I myself prefer and use a multiuse Buff...

As Ben said the part will be from a defunct unit and scavenged, motors that go to Bosch aren't returned but exchanged for another.