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I have a 1999 K1200LT with 48K miles on the clock of which I have done 5000 in the last 9 months .

As a bit of background information , I have over the winter changed the oil pump shaft and seals , replaced the timing chain guides and carried out a full fluids , filters and plugs service . This year I have fitted braided brake lines and new Metzler tyres . Last month I noticed a slight clutch slippage and I had the tell tale oil stains on the bottom of the bell housing . I have since replaced the rear main oil seal and o ring , fitted a full new clutch and a new slave cylinder and replaced all of the oil seals on the gearbox . The bike now runs fine but has a whine that only occurs between 62-67 mph in 5th gear . It does not happen in any other gear nor any other RPM and only under acceleration . If I keep the bike in 4th gear and accelerate up to 70mph then change to 5th I do not get the noise . Pulling in the clutch in 5th at 65mph when it is making the whine stops it . There is no play in the final drive nor the driveshaft and having just dropped both the final drive and gearbox oil both are completely clear with no residue or signs of metal . I have also changed the engine oil and filter and again it was clean .

I have read some posts that talk about a flying brick whine from straight cut gears and that the noise usually happens around 60mph but I am unsure if this applies to my 99 LT and is the noise I am hearing . The noise was not there before I put the new clutch and main seal in . I have also checked the driveshaft phasing and that is correct . The clutch operates smoothly and engages and disengages with no noises and I have no vibrations coming from the bike .

I would appreciate any thoughts as I am due to take the bike on a European Tour and do not want to breakdown on the top of the Alps or half way across the Pyrenees !
 

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My '99 seems to have developed the whine a few years ago. Only occurs between 60 - 63 mph in 5th on flat road. The mph range does vary depending on up/down grade of road.
Have always used Redline-heavy gear oil in the trans. I have ~60k on clock

HTH,
Jer
 

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Discussion Starter #3
My '99 seems to have developed the whine a few years ago. Only occurs between 60 - 63 mph in 5th on flat road. The mph range does vary depending on up/down grade of road.
Have always used Redline-heavy gear oil in the trans. I have ~60k on clock

HTH,
Jer
Thanks for this , seems to be the same noise I have . Will be interested if anyone else has experienced it or has any thoughts to what it could be
 

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Thanks for this , seems to be the same noise I have . Will be interested if anyone else has experienced it or has any thoughts to what it could be
I've brought it up before on this forum ( a few years back ), others chimed in that it's pretty common. Nothing has broken or has gotten worse, so I just keep riding.

Have fun,
Jer
 

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The whine under acceleration can indicate a failing input shaft bearing on the transmission. If you pull the drain plug magnet and it had a bunch of stuff on it, the likelihood of that bearing giving out is high. It is a sealed bearing so it doesn't matter what trans lube you are using.
 

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You would be nervous about shavings or chunks, very fine pasty looking stuff on the magnet is normal.
 

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The whine under acceleration can indicate a failing input shaft bearing on the transmission. If you pull the drain plug magnet and it had a bunch of stuff on it, the likelihood of that bearing giving out is high. It is a sealed bearing so it doesn't matter what trans lube you are using.


Gearbox oil is completely clear no residue whatsoever


Sent from my iPhone using Tapatalk
 

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Wrencher Extraordinaire
2005 K1200LT
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It is a sealed bearing so it doesn't matter what trans lube you are using.
Not exactly true, it is a shielded bearing and it comes packed with grease new but the trans oil WILL get into it. If it was sealed you would never get any flakes in the oil until the bearing totally failed. I fixed one where the balls came loose and beat up the cover plate to the transmission.
 
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