Electric or motor technie geek advice?

[wissy]

Hi

Odd thing happened on way back from work today with my KTM Bosch bike.... I went over a speed bump in lane, as I do slowly every day, and within a few seconds I thought the bikewas feeling a bit odd. The dial thing was half full so battery charge not a problem and it still said 'turbo' on the dial BUT no assistamce given at all. In fact the bike is harder to cycle now than when I first ever used the bike with no power at all. I remember how well it handled with no power but this issue today has not only stopped any assistance power at all but seems to have made the bike harder to cycle with power off big time.

Just asking on here in case somebody had an 'eureka' moment as I hoped to carry on cycling to work again tomorrow as it is addictive.... I know Electrifyingcycle are going to contact Bosch etc and sort it out but thought I would ask on here in case somebody can suggest a solution or give clues what they think it is. oh and the dial information goes on but off very quickly again after 6 seconds which is much quicker than norm when not pedalling.

Appreciate any suggestions what it may be?

Thanks! X

 

[Artstu]

It sounds like you briefly lost power on the system. I've had a similar experience when switching on with my foot on the pedal. Does it not correct itself after switching off and back on again?

 

[wissy]

Nope. Still the same a couple of hours later. Took battery out and replaced and same thing

 

[Artstu]

Is the rear sensor magnet still passing the censor on the rear stay in the right place?

 

[wissy]

Aha.. Now which part of sensor should magnet be 'nearest'? narrow end or blobby end? seems set well solidly in place and unlikely to have moved but worth asking? Any chance photo of correct position?

Ta x

 

[Artstu]

If it's solid I doubt it has moved then. Mine passes it roughly central with the B on Bosch.

 

[103Alex1]

I had a similar thing when my speed sensor magnet mounted on a spoke got knocked out of alignment. Straightened it and all was fine. It's probably on one of the rear spokes but someone with a bike like yours will know if the speed sensor itself is OK.

Check your brakes if it's like this when power off too. If your wheel got slightly buckled / went out of true they might be sticking or need adjusting (Can't remember whether you have rim or disc brakes on your bike).

 

[Artstu]

Have you had the battery on and off to see if that cures it. My display behaves like that when the battery is off the bike.

ooh edit, I see you've had the battery off as well.

Is the display unit still on properly. I took the screw out of mine to make it removable and it nearly fell off, I put the screw back in after that.

 

[RobF]

Pic of the sensor on the Rose:

 

[wissy]

Thanks fir all advice.. The magnet seems well firm but looks to be i. Diffent position to the Rose and the 'B' you mentioned earlier.

Here is mine:

What do you think??

 

[Artstu]

I'd move it and see what that does.

 

[wissy]

Right .. It works again (for now) but am kicking myself as I slightly adjusted the very very solid sensor and put in battery agai, after putting on charge. I did both at same time so cannot rule either sensor or battery out I guess.

having said that the dial thing did cut out after 6 seconds which is odd but the battery showed a clear 3 bars. The dial came back on for normal time when I put battery back in but I think the dial thing has its own battery so why stay 'normal'? the magnet thing moves round so motor never cuts out when it goes for a spin now does it?

I am leaning towards a battery issue? not sure whether to cycle to work tomorrow or not as I know how darned hatd it was pushing bike downhill earlier! Now why would the bike be slower and have more resistance than the time when bike worked normally and I switched power off. I had assumed that if power assistance went kaput the nonpower cycle ride would kick in? This time it seemed something was forcing resistance in the bike. Not brakes or dodgy wheel rims as they are fine. More of a heavy engine thing?

 

[RobF]

The sensor looked OK, and there is a fair bit of tolerance for the gap.

Have you checked the spade terminals in the battery holder?

I think someone on here had one of them bend, and because they are in an upward pointing cup the area can collect dirt.

 

[wissy]

Can I clarify something?

Does the sensor being misaligned also affect the 'ride' if power is say deliberately switched off?

Will misalignment of sensor affect the 'ride' if a battery is removed completely?

 

[Artstu]

The display shows the last battery reading, so when you switch it on after charging and replacing the battery it very briefly shows the last power reading before then going to full.

My bike can feel really sluggish off power at times, and at other times feel more like a normal bike, I'm not sure why, possibly just because I've gotten used to the power, and the reality of un-powered is hard work.

 

[wissy]

Thanks

the battery terminal spades (lower area) look fine and straight and no real dirt there. Does the top connector affect charge et al at all? The lock to release top bit is a bit tight.... i think that is just a lock area though?

 

[Artstu]

Can I clarify something?

Does the sensor being misaligned also affect the 'ride' if power is say deliberately switched off?

Will misalignment of sensor affect the 'ride' if a battery is removed completely?

Definitely not I'd have thought.

 

[wissy]

Hi

thanks. The battery was charged to almost full this morning. Tend to use just over 1/3 to go to work and just under to come back. Ahe dial showed normal use and usual reduction to about 3 bars near home and then 'dead'. i know what you mean by slsuggishness when unpowered but this was definitely different, hardly moved in any gear. Difficult to push even. very odd and shouldn't be misaligned sensor I would have thought or a dodgy battery come to that?

is there any way the motor could somehow thinkit was still 'on' and stop me cycling unpowered creating resistance.. In addition to not wanting to power me (dial did say turbo but no assistance at all)

 

[Artstu]

Does the top connector affect charge et al at all? The lock to release top bit is a bit tight.... i think that is just a lock area though?

That won't make any difference. Better to have the snug fit to the lock than some bikes that allow the battery to be fitted without the key. Mine always needs the key to fit the battery.

 

[Deleted member 4366]

Is your bike still difficult to push or ppedal switched off?

If so, something is slowing it down - logical. The crank has a free-wheel, so nothing in the motor can do it unless the free-wheel is jammed. I'll come back to this.

The first thing to do is lift each wheel off the ground and turn them by hand. If you feel any resistance, we're 90% of the way to finding the problem: brakes, wheel-bearing or tyre rubbing.

If both wheels spin freely. it's back to the motor. If you can, slip the chain off the chain-wheel and turn the crank, otherwise put it in first gear, lift the back wheel and turn the crank. Can you feel the motor going round or any other resistance? I heard there were some problems with Bosch motors where the internals broke, so it's possible something is broken in yours.