Bosch Classic+ Line (Scott eAspect 29er) Intermittent Motor Issue

mikemckinlay

New Member
Hi all! Thanks in advance for any insights into my problem.

I'm a life long bicycle mechanic who knows nothing about electronics other than not to stick a fork into an outlet more than three times. I own a 2012 Scott eAspect 29, the European model.

This bike sat unused for a few years and recently I managed to piece together the charger (OEM), a step transformer, the battery adapter and finally got her on the road. What a great feeling to not have to fret the giant hill half way to my home.

Recently the motor started to become intermittent. I'll pedal with power for three / four rotations then suddenly the motor disengages. No more assist. But as soon as I start to pedal again it does the same thing. 3 - 4 rotations with power then nada. I've almost found a rhythm to ride like this but I know it's not ideal.

The next issue is that my HMI display is cracked and unreadable, therefore I can't read the 'Troubleshooting Code.' I know there are potential resolutions like 'Buy A New Display' or 'Take It To The Shop.' Yes I know those options exist it's just that I'm on a really tight budget in life right now so I'm seeking some insights here.

So, #1, anyone encounter this type of issue before? #2, are there any Bosch mechanics in Canada (preferably Toronto) who have experience with the European versions of this motor or bike? #3, how much 'updating' is required by this era Bosch motor?

I know I've missed some key points but I'm sure your questions will bring out more info. Thank you all again for any potential insight and assistance.
 

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J.R.

Well-Known Member
Hi all! Thanks in advance for any insights into my problem.

I'm a life long bicycle mechanic who knows nothing about electronics other than not to stick a fork into an outlet more than three times. I own a 2012 Scott eAspect 29, the European model.

This bike sat unused for a few years and recently I managed to piece together the charger (OEM), a step transformer, the battery adapter and finally got her on the road. What a great feeling to not have to fret the giant hill half way to my home.

Recently the motor started to become intermittent. I'll pedal with power for three / four rotations then suddenly the motor disengages. No more assist. But as soon as I start to pedal again it does the same thing. 3 - 4 rotations with power then nada. I've almost found a rhythm to ride like this but I know it's not ideal.

The next issue is that my HMI display is cracked and unreadable, therefore I can't read the 'Troubleshooting Code.' I know there are potential resolutions like 'Buy A New Display' or 'Take It To The Shop.' Yes I know those options exist it's just that I'm on a really tight budget in life right now so I'm seeking some insights here.

So, #1, anyone encounter this type of issue before? #2, are there any Bosch mechanics in Canada (preferably Toronto) who have experience with the European versions of this motor or bike? #3, how much 'updating' is required by this era Bosch motor?

I know I've missed some key points but I'm sure your questions will bring out more info. Thank you all again for any potential insight and assistance.
With that display it looks like you have a gen1 system. I think that display was used 2010 through 2012. It may have gone into 2013. I think you'll have some difficulty with parts and service in North America. The system came with a small 288 watt hour battery. Are you using the original battery pack? I'm not a Bosch owner, but if I were trying to revive an older Euro spec drive I'd post this question on the Pedelecs UK forum.

https://www.pedelecs.co.uk/forum/

Here's an EBR video of the system.


Good luck!
 
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JRA

Well-Known Member
Although Panasonic and Yamaha made mid drives years earlier than the gen 1 Bosch it’s arrival showed the true potential and ability to provide a natural pedaling experience they lacked. I tried one at Demo day in 2010 on an EU brand hardtail bike and was immediately impressed.

JR has provided you with a good lead and should yield results to your issues if anything will.