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Any idea how much replacement controller is? I've priced LCD at £60 so controller is likely £100 plus so not being sure motor is not fried as well, it is looking like a complete kit at £387 maybe safer way to go. Would you agree?

Morning Wheelie Tried to remove motor housing but after extracting about 15 mm felt resistance, did'nt force any further Any advice?

Thanks Could you see the white powder on the casing from my pic, it seems to be in a strange place if things have blown inside the green label.

The brown mess is oil What's my next move? Any point testing

trying to upload better pic

Controller off, does'nt smell too fried Have a look at these

Controller off, does'nt smell too fried Have a look at these

Ready to start removing controller but I'm confused,no surprises there. Is the controller on the '8FUN' side or the chain wheel side? Wheeliepete is telling me to take the chain wheel off first

Yes it is possible to mix them up but he would still have had to connect a red to black. would that have left signs of a fryup?

No I gave him three sets of 2 times 5 cell Lipo's, to be honest, the sale happened so quickly, he was mad keen to get on the bike, I am not sure what charge the batteries had. His experience of bike electrics is very limited. Thanks for your later post, that's my job for tomarrow Cheers

Hello again Wheelie Just got the full tale of the fatal bike ride. When the son ,Adam got home he said'the bike was going great but he had to pedal a lot harder at the end' Ie, little or no power but the LCD was working as normal showing one bar out of five. An unknown state of charge battery...

Yes 5cell 5Ah and work well on my bike

Thanks again for your help Just tried the walk test no joy, so the controller is fried, as d8veh would say. Can I get the controller out with the motor on the bike? Does a blown controller mean the LCD is also gone , as it does not work on my mike?

Thanks Wheelie The problem is that I am talking to the father, it's his son who rode home on the bike, neither have any experience of ebikes. I'll ask him tonight if the bike had power when he got home. The battery connectors are Anderson so unless he connected red to black that should'nt have...

Thanks Woosh and d8veh for quick response I need to get my terminology to match yours. LCD is the display screen and on/off switch on the bars Bus cable is the main multipin connector from the motor to the LCD OK His LCD doesnt work at all My LCD lights up on His but no power My bus cable does...

I have just sold my e-mountain bike with Bafang BBSO2 500w motor. I had three years trouble free riding on and off road, gentle riding using only low to medium power levels ie max power 5 of 9. Unfortunately the new owner had a problem after his first ride home of only 5 miles. Before this ride...

Have you had the wheel off and checked the locking nut that holds the cassette in place on the freewheel splines? Obviously you need the splined extractor nut to do this. I've been messing about with my rear cassette to reduce this chain coming off problem, if you are interested I'll post what...

Thanks, sounds as you what you are doing, unlike me pushing my limited knowledge to the limit. No idea what HK XT 60 premade' s are? Like the watt meter idea, do you have a link to them?