Lost speedo and brake fail on after rear drive swap help please

[Brummydave]

Hi all
I swapped my final drive from an 08 bike to my 06 bike ,and lost speedo and brake fail is on ,I read that the two bikes have different numbers of teeth so bought an 08 front toothed wheel,still no joy,so checked the rear sensor out put ,all good,still no joy ,no faults shown on gs911 ,any advice or suggestions gratefully received thanks

 

[Pukmeister]

You can’t just swap the front wheel speed sensor/ABS reluctor ring and expect it to work, as you say the early versus later GS final drives do indeed have different teeth numbers. The speed sensor is taken from inside the rear FD unit.

The rear FD has cut outs machined into the rear main crown wheel face to provide the waveform for the sensor, so there is no way to swap the drive assembly and keep the speedo working that I know of, the late units are incompatible with the earlier bikes electronics

 

[Brummydave]

You can’t just swap the front wheel speed sensor/ABS reluctor ring and expect it to work, as you say the early versus later GS final drives do indeed have different teeth numbers. The speed sensor is taken from inside the rear FD unit.

The rear FD has cut outs machined into the rear main crown wheel face to provide the waveform for the sensor, so there is no way to swap the drive assembly and keep the speedo working that I know of, the late units are incompatible with the earlier bikes electronics

Ah that perfectly answered my worst thoughts,but thanks anyway ,I’ll rebuild my old unit (wheel bearing gone)and refit the FD,thanks again for the clarifications

 

[Pukmeister]

You could contact Mike Overy ( Mikeyboy on the forum ) at Overland & Classic, he has the tooling and experience to rebuild these to better than new.

 

[botus]

You can’t just swap the front wheel speed sensor/ABS reluctor ring and expect it to work, as you say the early versus later GS final drives do indeed have different teeth numbers. The speed sensor is taken from inside the rear FD unit.

The rear FD has cut outs machined into the rear main crown wheel face to provide the waveform for the sensor, so there is no way to swap the drive assembly and keep the speedo working that I know of, the late units are incompatible with the earlier bikes electronics

if you have ABS2 (from late 2006) the rear ABS sensor is the very same all the way forward including the R Ninety series bikes

I guess you have the earlier ABS (or no ABS) and its got you in a pickle - my 57 plate GS is running the rear bevel off a 2021 Scrambler and these even have the extra bracket on the steel back plate of the bevel for the GS's little nappy mudguard - its 100% plug and play - its meant to have shorter gearing but done 1000 mile so far and its not detectable - I was quite OK to get shorter gearing, but its not turned up in a way I noticed...

can you just run the later GS's rear sensor ? I expect the depth of the original sensor isn't seeing the crown wheel of the later bevel - hence no speedo and no ABS self check completed

Angle drive with ventilation Diagram for BMW K23 (R nineT Scrambler) R nineT Scrambler (0J31, 0J33) (2019) Catalog | RealOEM.com

BMW parts K23 (R nineT Scrambler) R nineT Scrambler (0J31, 0J33) Angle drive with ventilation

www.realoem.com

13

Wheel-speed sensor

1

34527677824

34527677824

Wheel-speed sensor​

From: 01.08.2006 To: - Weight: 0.044 kg Price: $86.85
Part 34527677824 was found on the following vehicles:

• K25 (R 1200 GS)   (12/2002 — 12/2012)
• K25 (R 1200 GS Adventure)   (03/2005 — 07/2013)
• K26 (R 900 RT, R 1200 RT)   (11/2003 — 06/2014)
• K27 (R 1200 R)   (11/2005 — 07/2014)
• K28 (R 1200 ST)   (05/2003 — 11/2007)
• K21 (R nineT)   (01/2013 — 12/2019)
• K22 (R nineT Pure)   (12/2015 — 12/2019)
• K23 (R nineT Scrambler)   (09/2015 — 12/2019)
• K32 (R nineT Racer)   (12/2015 — 07/2019)
• K33 (R nineT Urban G/S)   (03/2016 — 12/2019)
• K40 (K 1200 S, K 1300 S)   (04/2003 — 09/2015)
• K43 (K 1200 R, Sport, K 1300 R)   (03/2004 — 07/2015)
• K44 (K 1200 GT, K 1300 GT)   (11/2004 — 10/2010)
• K48 (K 1600 GT, K 1600 GTL)   (01/2010 — 12/2019)
• K61 (K 1600 Bagger)   (01/2017 — 12/2019)

below the OLD (early model) rear ABS sensor

Bevel gear, Integral ABS Generation 1 Diagram for BMW K25 (R 1200 GS) R 1200 GS 04 (0307,0317) (2006) Catalog | RealOEM.com

BMW parts K25 (R 1200 GS) R 1200 GS 04 (0307,0317) Bevel gear, Integral ABS Generation 1

www.realoem.com

Wheel-speed sensor

1

08/2006

34517666436

34517666436​

Wheel-speed sensor​

From: 01.02.2004 To: - Weight: 40.000 kg Price: $134.33
Part 34517666436 was found on the following vehicles:

• K25 (R 1200 GS)   (12/2002 — 10/2007)
• K25 (R 1200 GS Adventure)   (03/2005 — 09/2007)
• K26 (R 900 RT, R 1200 RT)   (11/2003 — 11/2009)
• K28 (R 1200 ST)   (05/2003 — 11/2007)
• K40 (K 1200 S, K 1300 S)   (04/2003 — 08/2008)
• K43 (K 1200 R, Sport, K 1300 R)   (03/2004 — 08/2008)
• K44 (K 1200 GT, K 1300 GT)   (11/2004 — 09/2008)

 

[DrFarkoff]

That guy above talks some Bullshit!

Basically the Servo abs/non abs final drive unit pre 2006 cannot be changed for a later Final drive unit and vice versa!

Bere endeth the blurb!!

 

[Pukmeister]

The FD is different between early and later Hexhead GS’s, despite looking externally similar.

Just ask Mikeyboy if you don’t believe me, he knows these items literally from the inside out.

 

[DrFarkoff]

The FD is different between early and later Hexhead GS’s, despite looking externally similar.

Just ask Mikeyboy if you don’t believe me, he knows these items literally from the inside out.

To be a pedant (Lord forbid)

The ABS sensor and abs Ring are the issue

It works fine other wise

 

[Pukmeister]

There are also differences in the input pinion bearing.

Who’s being pedantic now !

 

[DrFarkoff]

There are also differences in the input pinion bearing.

Who’s being pedantic now !

Dammit Out Pedanted

BUT in my defence it does work but you need a GPS for speed and your abs is fucked

 

[mikeyboy]

There are also differences in the input pinion bearing.

Who’s being pedantic now !

From intro to 2006 the input pinion nose bearing was 30mm OD
2006 on were fitted with a 32 mm OD bearing which also has an oil drilling

 

[botus]

That guy above talks some Bullshit!

Basically the Servo abs/non abs final drive unit pre 2006 cannot be changed for a later Final drive unit and vice versa!

Bere endeth the blurb!!

are you as unhelpful as you appear ?

I wrote

can you just run the later GS's rear sensor ? I expect the depth of the original sensor isn't seeing the crown wheel of the later bevel - hence no speedo and no ABS self check completed

unless the operation / signal generated from the earlier sensor and crown wheel is different - why can't you run the sensor that fits and picks up the info of the later crown wheel in the later bevel...

 

[DrFarkoff]

1. are you as unhelpful as you appear ?
2. I wrote
3. , unless the operation / signal generated from the earlier sensor and crown wheel is different - why can't you run the sensor that fits and picks up the info of the later crown wheel in the later bevel...

1) No I just use the K I S S system "Keep it Simple STUPID" rather than your B T W B system "Baffle them with BULLSHIT"

2) You did indeed

3) and you explained the issue perfectly!! and you simply can't! I know "why" but all You need to know is it in Bit form Yes No and the answer is a full no it won't work pre 2006 on later and vice versa

I am suspecting more and more you are an AI bot You make lots of noise nut nothing really useful appears at the end of the connection

#EndSession

 

[botus]

I didn't have my GS at hand to check at the weekend but I suspected there was a setting....

have a look in the ZFE coding options for your early bike - and check if its set on 78 teeth - later bikes with ABS2 run a 48 tooth reluctor

 

[DrFarkoff]

I didn't have my GS at hand to check at the weekend but I suspected there was a setting....

have a look in the ZFE coding options for your early bike - and check if its set on 78 teeth - later bikes with ABS2 run a 48 tooth reluctor

And What ?? Are you suggesting that the OP recodes the algorithm to read the other pulses ??

There is ALSO a difference in the Wheel speed sensor the later one should not plug into the earlier loom But its about 10 years from I did this one

 

[botus]

if it says 78 on his bike why not try ticking the 48 tooth tick box in Motoscan app or the GS911 - they both support the change