BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Faulty Rev Counter Empty Faulty Rev Counter on Thu Mar 24, 2016 10:38 am

rob_gordon

rob_gordon
active member
active member
I have K100RT (1987) which came with a faulty speedo and rev-counter. The speedo didn't work at all so I replaced the Impulse transmitter which fixed the speed issue. However, I am not sure how to go about fixing the rev counter. It works to an extend but reads about 1500 rpm too low. The needle seems to be way below the 'zero' when the bike off and sits at about the 'zero' level when the bike is running at idle. I wondered if anyone had a similar issue and whether I should be taking the instrument panel out and adjusting the needle or whether the issue may be at the pickup from the engine (not sure where the rev-counter picks up its signal.  Any help greatly appreciated.

    

2Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Thu Mar 24, 2016 11:36 am

Chocolate

Chocolate
Life time member
Life time member
Hello!

The rev-counter gets it's signal from the ignition coils.
You could do some electric maintenance, DeoxIT as a example.


1.) ignition coils connection
2.) take of the speedo and clean the connection on the rear side
3.) have a look inside the speedo
http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/flakyspeedo/flakyspeedo.htm


Cheers


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

3Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Thu Mar 24, 2016 4:25 pm

sidecar paul

sidecar paul
Life time member
Life time member
Hello Rob, it sounds as though the rev counter needle has moved on it's shaft. It's just a push fit so it should be easy enough to pull it of the shaft and reposition it at zero.

Good luck,
Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

4Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Thu Mar 24, 2016 11:12 pm

RicK G

RicK G
admin
admin
@sidecar paul wrote:Hello Rob, it sounds as though the rev counter needle has moved on it's shaft. It's just a push fit so it should be easy enough to pull it of the shaft and reposition it at zero.

Good luck,
Paul.
Totally agree with Paul. It is easy to get the needle in the wrong place when replacing it after having the dial off.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

5Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 8:07 am

rob_gordon

rob_gordon
active member
active member
Thanks for the replies and the great link. Sounds like its worth cleaning up the electrics and sorting out the needle position. I will crack on with that at the weekend. 

While I have the instrument cluster off, I wondered if it was possible to get a new gear indicator and clock display at the same time. Can these be purchased and fitted separately or are they part of the main circuit?



Last edited by rob_gordon on Tue Mar 29, 2016 8:19 am; edited 1 time in total

    

6Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 8:18 am

charlie99

charlie99
VIP
VIP
they are just a pcb that pushes onto pins in the instrument cluster and fixed with a couple of screws

motoworks have them as second hand parts on their website availability is always variable  

as usual pins that are connected to sockets on anything that vibrates needs special care with the contacts between the 2 parts

look up "deoxit " ...and have a good look whilst you have it apart for wear spots between the contacts
good luck


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFaulty Rev Counter Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

7Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 8:37 am

Chocolate

Chocolate
Life time member
Life time member
Hello!

Maybe this link helps.

Cheers

Fix A Flaky K Bike Speedometer


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

8Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 8:52 am

rob_gordon

rob_gordon
active member
active member
Thanks Chocolate, I just drilled back up that link you provided to the top level. There are a lot of really helpful maintenance guides there. Really useful!

    

9Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 8:58 am

Chocolate

Chocolate
Life time member
Life time member
Yes Rob, indeed, nice page.

Cheers


__________________________________________________
Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

10Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 9:03 am

rob_gordon

rob_gordon
active member
active member
Charlie99, thanks for the pointer on the clock and gear indicator. The price is quite steep so I have only ordered the gear indicator as that is totally shot but the clock is not in too bad a shape so I am hoping cleaning up some connectors will get it fully working. If not, I might live with that for a while  Smile

    

11Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Tue Mar 29, 2016 1:27 pm

charlie99

charlie99
VIP
VIP
there are a few interesting posts about the clock right here in the forum

use the search feature ??

cheers


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFaulty Rev Counter Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

12Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Wed Apr 06, 2016 8:25 am

rob_gordon

rob_gordon
active member
active member
Thanks to all for the advice and help as I managed to reset the rev counter and although I don't know if its very accurate, it is definitely better than it was. I also managed to replace the gear indicator circuit and was amazed that it worked straight off!.  While I was working on the bike I also replace the clutch push rod rubber boot as the old one had a hole in it and was leaking oil. I have to say, there was allot of cursing required to get fit the new boot!



Last edited by rob_gordon on Wed Apr 06, 2016 8:38 am; edited 1 time in total

    

13Back to top Go down   Faulty Rev Counter Empty Re: Faulty Rev Counter on Wed Apr 06, 2016 8:32 am

charlie99

charlie99
VIP
VIP
good to hear

ride well


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFaulty Rev Counter Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum