Ongoing reliability of Kalkhoff/Focus Impulse 2 motors

Tim Davies

Finding my (electric) wheels
Aug 21, 2018
14
8
62

octopusenvy

Just Joined
Jul 5, 2020
3
0
Hi all, just a final update with some positive result! I actually have the Impulse RS II motor on both bikes, and after a good LBS pulled my motor and checked all the contacts for only $50, everything is working again! What they DID find is a decent crack at the back of the screen tho :( That could have been causing the comms issue, so even tho it works, I glued it and swapped it for my wifes computer. She rides very lightly and I don't! Here's hoping things work fine for a long time to come, and shout out to Northland ebikes for an honest and cheap service!

Just updating that I still haven't solved the issue on my Impulse EVO RS motor. I mistakenly labeled it and my wife's as an EVO 2.0, but they are the better/newer EVO RS. Hopefully it's just a contact, but I'm going to plug it into a diagnostic at the LBS to see if it comes up with any codes. I don't see any on the screen, but there may be something there I can't see. I will also clean the contacts on both the battery and on the bike etc. It seems to be just a comms error, but not sure where that poor connection is happening. Any other suggestions?
 

Bobajob

Esteemed Pedelecer
Nov 1, 2019
312
139
Cornwall
I bought a Kalkhoff Agattu Premium 3 years ago for £2695.00. The bike is excellent apart from the motor. I had a replacement 2.2 motor 18 months ago (still under warranty) and this one has started making horribly load cracking noises although so far it is still rideable. I suppose I am going to have to ask for a replacement motor again. I would not buy a Kalkhoff again and I could not recommend them. The design and quality of the bike is first class it is just let down by this wretched motor.

The problem is that when you have spent this amount on a bike you are reluctant to just give it up as a lost cause.
I wonder if it is possible to install another make of motor or am I stuck with the Impulse motor ?
Any advice as to the way forward would be much appreciated.
Don’t ask for a replacement just take the bike back to the dealer and say it want my money back as it’s not fit for purpose. They obviously will try and wriggle out of it. Explain there is nothing personal, you know it seems a manufacturers fault but you bought it from them (the dealer) and your redress in law is with them.
with evidence from this forum alone will make a water tight case if you go to court for your money to be returned.
The dealers should have returned all their bikes to kalkhoff when these issues arose in the first place.
my local dealer is brilliant but avoided kalkhoff like the plague until their act was properly into gear.
Imagine if woosh bikes on here had an issue with their bikes like kalkoff, he’d be out if business.
 

rubencarbonero

Just Joined
Oct 5, 2020
1
0
Hi dear friends,

I come late to this thread unfortunately.

In 2018 I purchased a 2nd hand Kalkhoff Agattu i7. The bike was originally purchased in April 2015 - I was handed the invoice. The odometer read 5450 km (3386 miles) when I bought it. I had no clue of what was going on with the Impulse motor at that time. The bike was dirt cheap at about eur 600 and looked, and worked, like a charm.

The original owner told me later that the bike was on her 2nd motor. A 1st motor had been changed at about 8970 km (5574 miles).

I was so happy that I bought a new 17 Ah battery and charger for about eur 650. I get about 100 km (60 miles) mileage, which is quite good.

At about 13000 km, the aluminum frame broke. The bike was registered, and Kalkhoff offers lifetime warranty on frames, so Kalkhoff via my nearest dealer honored it and agreed to supply a new frame. I had to pay for the labour cost and used the chance to renew some perishables (brakes, cables), so I spent about eur 200 + about 150 eur shipping and petrol costs, and had the bike there for about 6 weeks.

Now at nearly 15000 km (9320 miles), it is the motor that is starting to die. It still pushes but I hear strange noises, some clicking, and the crankset feels wobbly and sometimes hard to push. I have disconnected the motor and then I get no noises or odd feelings at the crankset (although the bike is indeed heavy).

Changing the motor again would set me back about eur 450 including shipping costs. And I would need to check with my dealer whether they'd be willing to do it.

So I'm doubting whether it's worth substituting the motor again + adding a bearing reinforcement kit, or sell this bike, or whether there is some way to find new pieces, or what.

'Bearing overhaul kits' are available at about 100 eur incl. shipping to Spain, but I believe they do not include the nylon parts:

Nor do I know whether this is something that would require an USB diagnose or some other unexpected difficulties. And I believe this would be useful for a new motor only.

Another alternative is to locate a 2nd hand bike and swap the motor & LCD unit, but I'm not sure this is doable without diagnosis tools.

Will keep you posted once I get some alternatives, thank you and kind regards!
 

GSV3MiaC

Pedelecer
Jun 6, 2020
185
119
Problem with your last proposal is that that any other Impulse motor you can find, s/hand, is just as likely to die as yours is.. The problem is endemic to all of them.
 
  • Agree
Reactions: flecc

olepro

Just Joined
Jun 11, 2017
2
4
57
Denmark
Hi all
After 18000 km on my (2016) Kalkhoff with Impulse EVO RS motor, and sometimes failing pawls, I disassembled the engine and replaced the spring which presses the pawls into engagement with a more powerful one. (This I believe is the main problem on the Impulse motor)
Since then, there have never been any problems with the engine. It now runs after 29000 km still like butter.
I have made a report regarding this change which can be seen here if anyone should be interested

 

Ciano

Finding my (electric) wheels
Oct 27, 2015
6
0
55
Hi all
After 18000 km on my (2016) Kalkhoff with Impulse EVO RS motor, and sometimes failing pawls, I disassembled the engine and replaced the spring which presses the pawls into engagement with a more powerful one. (This I believe is the main problem on the Impulse motor)
Since then, there have never been any problems with the engine. It now runs after 29000 km still like butter.
I have made a report regarding this change which can be seen here if anyone should be interested

Hi olepro

I found your post 'Words about my Kalkhoff Integrale 8 LTD' really helpful and informative.
I am experiencing the exact same problems as you describe and suspect the 'pawls'.
I am confident of fixing this myself in a similar way you outlined.

One question I hope you may be able to answer is after taking off the crank arms there is the Impulse chainring / spider on the crank axle.

How does this come off?
Does it simply pull off the splines? or is it a lockring?

I attach a photo of my motor for reference.

Thanks.
IMG_20210908_204152.jpg
 

soundwave

Esteemed Pedelecer
May 23, 2015
11,592
4,770
you could also ask these guys as the only place i know that still deals with these motors.


i cant even find anything on the german forum on how to remove it and with what.
 

Ciano

Finding my (electric) wheels
Oct 27, 2015
6
0
55
you could also ask these guys as the only place i know that still deals with these motors.


i cant even find anything on the german forum on how to remove it and with what.
you could also ask these guys as the only place i know that still deals with these motors.


i cant even find anything on the german forum on how to remove it and with what.
Hi soundwave

Peter at performancebearings gave me this info. (image below)
Thanks for your contact and reply's to my question.

I will post up how I get on with my attempts at Impulse 2.0 motor service / overhaul
for info anyone else who might be struggling.

43928
 

septamello

Just Joined
Sep 21, 2021
4
0
I am seriously considering either the Include 8 or stepping up to the Integrale 8 for the better hub and hydraulic brakes. I have about a 7 mile commute with some considerable uphill on the way home. Not sure I could use it year round especially if we have winters as brutal as the last one. Are there other bikes in the same price range (they are on "sale" right now for $3520 and $3760 Tutuapp 9Apps Showbox respectively) for comparable quality?
 
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Ciano

Finding my (electric) wheels
Oct 27, 2015
6
0
55
Serviced my Impulse 2.0 motor on a 2015 Focus Jarifra. Got a bearing kit from performancelinebearings.com. First class service. All bearings replaced. No evidence of water ingress so made sure to seal the motor case. Bearing replacement (x8 bearings and 3 seals) quite straightforward. My Impulse 2.0 motor had always had a problem whereby the motor would slip )felt like chain slipping)when stepping on the pedals with force so did the 'pawl spring' mod mentioned here. Made a new spring out of 1.0mm spring wire. Everything went back ok and have had two days of testing. So far so good.


IMG_20211011_133951.jpgIMG_20211011_145423.jpg44422IMG_20211011_150326.jpg
 

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