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Listen for the Knock! Video link

 
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tHeMoLLuSK



Joined: 31 Aug 2013
Posts: 5
Location: NORMAN, OK

PostPosted: Thu Sep 13, 2018 2:06 pm    Post subject: Listen for the Knock! Video link Reply with quote

Hello all, recently resurrected my 1997. Went through and did several things while replacing the clutch. I am noticing a knocking sound. Any advice/ideas?

Thanks in advance

https://youtu.be/nsWRW7Dw3cY
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1997 K1100LT
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Dave6172
Mad Brick Rider


Joined: 20 Jun 2013
Posts: 84
Location: Winston Salem, NC

PostPosted: Tue Sep 18, 2018 2:37 pm    Post subject: Reply with quote

Mine does that as well, but only when it's cold. by the time the needle on the temp gauge begins to move the knock is gone. Mine has done this for a couple years, before and after a clutch replacement. 111,856 miles, runs fine. I'm not going obsess about it. YMMV. Cheers!
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Dave6172
Mad Brick Rider


Joined: 20 Jun 2013
Posts: 84
Location: Winston Salem, NC

PostPosted: Fri Sep 21, 2018 1:46 pm    Post subject: Reply with quote

BTW, my '97 is the same color/model as yours. Great bike!
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Al.
Flying Brick Rider


Joined: 28 Oct 2005
Posts: 370
Location: West of Ireland

PostPosted: Mon Sep 24, 2018 5:51 pm    Post subject: Reply with quote

Mine is kinda noisy but not as loud.
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beemeerr11
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Joined: 05 Mar 2006
Posts: 168

PostPosted: Thu Nov 10, 2022 6:46 pm    Post subject: Reply with quote

Mine is doing that same knocking sound, but only when at idle, when you rev or ride it goes away. Any other thoughts please?
Thanks
Lou
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Jim
Site Admin


Joined: 17 May 2003
Posts: 3831
Location: WHERETHEFUNNEVERENDS

PostPosted: Sat Nov 12, 2022 12:10 am    Post subject: Reply with quote

Sounds normal to me. These bikes are noisy - there's a lot going on down there.
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1997 K1100LTSE 94,000 - has gremlins!
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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 10027
Location: Bumf***, WA

PostPosted: Sat Nov 12, 2022 2:52 am    Post subject: Reply with quote

If it sounds like "a box of rocks" at idle then that is "normal."

Another good reason to wear earplugs. Laughing
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Grunter
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Joined: 30 Sep 2015
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Location: North East England

PostPosted: Sat Nov 12, 2022 6:52 pm    Post subject: Reply with quote

With earlier K100 bikes and to some degree K75 bikes the knock at idle speed can usually be ironed out and made inaudible by carefully balancing the injectors.
The contributor who said it disappeared when the engine was warm is a factor that suggests this may be the case.
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beemeerr11
Flying Brick Rider


Joined: 05 Mar 2006
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PostPosted: Sun Nov 13, 2022 5:26 pm    Post subject: Reply with quote

My Bike 1995 LT was off the road for a while when I had overheating issues, but I don't ever recall it being that rattly or knocking that much, one guy here suggested its the rubbers in the monkey nuts, is that such a thing?
Cheers
Lou
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Grunter
Flying Brick Rider


Joined: 30 Sep 2015
Posts: 319
Location: North East England

PostPosted: Sun Nov 13, 2022 6:06 pm    Post subject: Reply with quote

beemeerr11 wrote:
My Bike 1995 LT was off the road for a while when I had overheating issues, but I don't ever recall it being that rattly or knocking that much, one guy here suggested its the rubbers in the monkey nuts, is that such a thing?
Cheers
Lou

Yes that can be a cause of knocking but the noise at idle speed and a little above is more like a worn out cam chain tensioner.

The 'monkey nuts are the actual rubber shock absorbers in the alternator drive train and after a time they can start the break up. Also if the drive vanes that power the alternator (through the 'monkey nuts') become unscrewed from the actual drive out of the gearbox even by a couple of turns you get the same affect/noise. It is a simple repair providing the vanes or the drive cup are not damaged.

Because of the high temperatures the drive cup has to endure when retightening the retaining bolt you should use a high temperature, high strength form of thread lock and always torque the nut to the recommended setting
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beemeerr11
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Joined: 05 Mar 2006
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PostPosted: Tue Nov 15, 2022 1:17 am    Post subject: Reply with quote

So If it is a worn cam chain tensioner, is it like my Japanese bikes that it can be adjusted further or is it a case of a total new bottom adjuster?
Cheers
Lou
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Grunter
Flying Brick Rider


Joined: 30 Sep 2015
Posts: 319
Location: North East England

PostPosted: Tue Nov 15, 2022 5:07 am    Post subject: Reply with quote

The tension blades do wear out on a 'K' series bike like the 75.100,1100 and 1200's flat 3 or 4 multicylinder bikes but the cam chain running permanently in an oil bath will last at least 150,000 miles but the tensioner may be changed 3 times in the life of the bike.
I changed the one on my last K75 at 66K miles and the chain had not stretched at all but the long tensioner was toast with the slipper blade worn down to the metal base.

I cannot say or quote anything about the longevity of Japanese bikes, some are better then others, but I have hear about more snapping camchains on the Japanese bikes than BMW's. Honda had an awful problem in the late 1970's early 1980's due to bad design. You have to take each design/make in context and follow the directions on maintenance given by the manufacturer.
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