BMW K bikes (Bricks)

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1Back to top Go down   Clatter/Rattling when throttling down. Empty Clatter/Rattling when throttling down. on Wed Jul 17, 2013 3:30 pm

Gacknoops

Gacknoops
active member
active member
Per the topic, when I let off the throttle at any speed there's a rattling or clatter coming from somewhere around my right foot peg. It also makes a more hammering sound at higher torque situations like leaving a stop sign or climbing a hill in too high a gear. This noise is present even when the bike is cold but does seem to get slightly louder as the bike warms up.

I'm an experienced technician so please feel free to answer in whatever technical terms you need to explain your diagnosis.

    

charlie99

charlie99
VIP
VIP
hmmm
monkey nuts ?

that's the rubber insulators between the altenator and the drive gear
just behind - inside the right foot


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OClatter/Rattling when throttling down. Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

Gacknoops

Gacknoops
active member
active member
Is that something that I could let go until winter?


__________________________________________________
K100RS
year, 1989
84,000 miles.
    

Gacknoops

Gacknoops
active member
active member
Thanks Charlie!

I just did the same google search I've been doing but added "alternator" and BOOM! Apparently it's the most common complaint in the K series.
Thanks again for your help!

Brian


__________________________________________________
K100RS
year, 1989
84,000 miles.
    

charlie99

charlie99
VIP
VIP
you risk braking the bell housing that connects to the altenator ...but more importantly the drive mechanism , its shaft and sprag clutch (used in starting ) along the same auxiliary shaft

doesn't take long to do ..but could save a major pull down to do the other repair


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OClatter/Rattling when throttling down. Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

Gacknoops

Gacknoops
active member
active member
I'm googling the procedure as we speak (type).

Thanks again!


__________________________________________________
K100RS
year, 1989
84,000 miles.
    

RicK G

RicK G
VIP
VIP
Monkey nuts or the uni joint is shagged.


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

billy_k100

billy_k100
active member
active member
any idea what the problem area was? My 86 K100rs has very similar symptoms

    

AL-58

AL-58
Life time member
Life time member
I was going to say uni joint too.  They can clatter a bit on high torque loads before failing completely.  Had it happen myself.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Clatter/Rattling when throttling down. K-dogs10
    

10Back to top Go down   Clatter/Rattling when throttling down. Empty Re: Clatter/Rattling when throttling down. on Mon Nov 04, 2013 4:07 am

billy_k100

billy_k100
active member
active member
@AL-58 wrote:I was going to say uni joint too.  They can clatter a bit on high torque loads before failing completely.  Had it happen myself.

Al
Thanks. As I am going to dissemble the drive train, when signs should I look for when inspecting the drive shaft uni-joint?

    

11Back to top Go down   Clatter/Rattling when throttling down. Empty Re: Clatter/Rattling when throttling down. on Mon Nov 04, 2013 4:13 am

AL-58

AL-58
Life time member
Life time member
Mine was obvious as it failed completely.  I'd be checking for any play in the universal joint.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Clatter/Rattling when throttling down. K-dogs10
    

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