BMW K bikes (Bricks)

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1Back to top Go down   Disc bobbins replacement Empty Disc bobbins replacement Sun Aug 30, 2015 4:55 pm

oldbikemart

oldbikemart
active member
active member
Hello, My disc bobbins are very worn on my K100RS 16v 1990 with 56k miles. Is it worth replacing just the bobbins, or should I replace the discs as I intend to keep the bike for a few more years?
Regards, Martin.

    

2Back to top Go down   Disc bobbins replacement Empty Re: Disc bobbins replacement Sun Aug 30, 2015 8:14 pm

Dai

Dai
Life time member
Life time member
Define 'worn'? Have you checked sizes (bobbin and disc) against the OEM specs?


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

3Back to top Go down   Disc bobbins replacement Empty Re: Disc bobbins replacement Sun Aug 30, 2015 9:25 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
There's a fair amount of rattle inherent in the 305mm discs of the 16V models. If the discs aren't moving side to side and you can't hear it at a crawl, it's likely still in spec. But you're prolly up on that.


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1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

4Back to top Go down   Disc bobbins replacement Empty Re: Disc bobbins replacement Mon Aug 31, 2015 4:49 am

oldbikemart

oldbikemart
active member
active member
The discs have about 3mm sideways play at  the rim and some movement back and forth, which was the MOT tester's real issue. There is a K1100 LT that parks next to me at work which has been a useful guide as to how much or little play the OE set up has, and there's quite a big difference. I'm going for new discs, then I will get the benefit rather than the next owner! Martin

    

5Back to top Go down   Disc bobbins replacement Empty Re: Disc bobbins replacement Mon Aug 31, 2015 6:01 am

Dai

Dai
Life time member
Life time member
Somebody with a 4V (or better knowledge of the metals used) is going to have to jump in on this, but if the discs and the bobbins are the same hardness then yes, you'd need to replace both. In this case I'd go looking for non-OEM (e.g. PGM / Ferodo) as they're half the price of OEM for what I suspect is a better disc.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

6Back to top Go down   Disc bobbins replacement Empty Re: Disc bobbins replacement Mon Aug 31, 2015 9:51 am

RicK G

RicK G
admin
admin
I got a very good price on discs from James Sherlock a few months ago, not sure if he still has them but worth a try.


__________________________________________________
"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
    

7Back to top Go down   Disc bobbins replacement Empty Re: Disc bobbins replacement Mon Aug 31, 2015 6:08 pm

robmack

robmack
Life time member
Life time member
The side to side is looser than mine but I have no front to back movement in my K1100 front rotors, so your bobbins are worn.  Motobins sells a on disk set of 12 bobbins for GBP 28.00 (part number 20393).  These are steel bobbins by Grimeca whereas the OEM bobbins are aluminum.  Cheaper than a new set of rotors.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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