K11 Owners Group

AUSBRICK · Posted: Sat Jan 31, 2015 4:05 pm Post subject: THE K11 KNOCK

Hi all , wondering if any one knows the source of the slight knocking all k1100s seem to have at varying degrees on start up when idling , it goes away with revs and is far less noticeable once warmed up . All my k's have fairly high mileage and the higher they are the louder the knock. I remember something about the rear output bearing and starter clutch can get noisy could one of these be the problem . Cheers AB
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92k1100 lt with sidecar. 93K1100 CAFE..86K75C.95 k1100lt

whyoldbill · Posted: Sat Jan 31, 2015 4:12 pm Post subject:

Can't speak to the source of that noise, but I just bumped my idle speed up to about 1000 rpms and the knock is no longer audible.
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'02 - GL1800

The desired effect is what you get when you improve your interplanetary funksmanship - George Clinton

carp · Posted: Sat Jan 31, 2015 5:50 pm Post subject:

I think it means your K engine only has 300,000 miles left in it.
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93 K1100LT
07 Bandit 1250S

koapono · Joined: 01 Apr 2014 Posts: 4

just my experience.
my 94 K1100LT developed a god-awful knock at idle then disappeared with a twist of the throttle.
after hours of searching and isolating components i discovered several cracks and a good sized hole (probably 1/2 inch diameter) in exhaust collector at muffler. had them welded up and now purring like a K-itty.
every scenario is different but this may be worth a look for you.
g'luck

exavid · Posted: Wed Feb 04, 2015 1:39 am Post subject:

A knock that's audible at idle and goes away with increasing rpms can be due to unbalanced throttle bodies on a EFI engine or carbs on a carbureted bike. Both my previous K1100LT with 80,000 miles and my current one with 12,000 miles had roughly the same slight knock when cold. Pretty much went away as you advanced the fast idle toward the first notch.
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Paul W.
2013 C650GT
1995 K1100LT

Molon Labe

hosehoundfr86 · Posted: Thu Feb 05, 2015 7:56 am Post subject:

I feel my"knock" through the clutch handle, could be the release bearing ,, but like the others it goes away with a little throttle or choke ,, I did get some noise from the exhaust but welding it quieted it down

Number 6 · Posted: Thu Feb 05, 2015 8:42 pm Post subject:

Not sure what "knock" you're revering to. With a very low idle, like when the engine is real cold, there can be some knock, other than that there is an issue, can be a throttle sync as mentioned. The exhaust collector cracks are very common and can even lead to a valve failure, but I it doesn't feel like a "knock" to me.
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I am not a number, I am a free man.

94 K1100LT

AUSBRICK · Posted: Sun Feb 08, 2015 7:41 am Post subject:

starting to think it maybe from the gearbox will investigate further
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92k1100 lt with sidecar. 93K1100 CAFE..86K75C.95 k1100lt

David_S_Walker · Posted: Sun Feb 08, 2015 2:56 pm Post subject:

Hello,

I had a knock at idle on my K1100...

After checking the throttle bodies (Balancing) and many other checks it turned out to be the "monkey nuts" in the alternator coupling!

All silent at idle now...

Best regards,

David
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2006 BMW R1200S
2006 Subaru Outback 3.0 Rn
Abarth 595 Competizione 180bhp

old guy old bike · Posted: Mon Feb 09, 2015 1:26 pm Post subject:

molerat · Posted: Mon Feb 16, 2015 3:17 pm Post subject:

Inge K. · Posted: Mon Feb 16, 2015 8:28 pm Post subject:

http://www.euromotoelectrics.com/Alternator-Rubber-Mounting-BMW-K-BMW-ALTK877-p/bmw-altk877.htm

David_S_Walker · Posted: Tue Feb 17, 2015 4:28 am Post subject: