K11 Owners Group

nickw · Posted: Thu May 12, 2011 8:23 pm Post subject: New noise for me!

Now that Spring has arrived here in Northern VT, I have been riding to work and loving it.
New noise surfaced Tuesday afternoon after my ride home. I shut the bike off and immediately heard a very high pitched squeal that lasted for about three seconds. The bike was at normal temp when I switched it off.

I restarted it and it would not repeat. The next day the sound repeated on shutoff when I got to work. Did not repeat at the end of the day.

Today I filled the tank full from 1/4 and haven't been able to repeat the noise although I made about five trips top various places about ten miles apart.

Any ideas on what is coming my way?

Nick W
_________________
"It's not what people know, it's that they know so much that just ain't so!" (Apologies to Will Rogers)
93 K1100LT
(2) 79 Suzuki GS850's (In limbo)
65 Triumph TR6S/C ( sold)
2009 Suzuki SV650
2009 Suzuki DL650

rbm · Posted: Fri May 13, 2011 8:13 pm Post subject:

Fuel pump maybe?? Fuel cools the pump so low fuel conditions will result in a warmer pump and possibly expansion in the impeller region caused the noise.
_________________
- Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer

Stoked Steve · Posted: Fri May 13, 2011 9:19 pm Post subject:

Sounds like our noisey fuel pumps that do not like to run on low tanks.

Could also be a bit of vacuum pressure if your tank vent lines are not breathing properly.

Keep her full and happy!
_________________
Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom

monty8563 · Posted: Mon May 16, 2011 5:43 pm Post subject: new noise

have a noise of the same kind please read my post on tec page buzzing petrol tank, let me no what you think monty Confused

_________________
B.M.W K1100rs 1994
honda cx500b
hondacx500z

nickw · Posted: Mon May 16, 2011 6:19 pm Post subject:

Monty:

My noise comes ony after I shut the bike off. And then does not always occur. If the damn rain hadn't returned, I would be out running it, trying to figure it out.

Thanks to the others who replied, it sounds like a pressure bleed-off might be the culprit, but it stops abruptly without changing pitch like a bleed-off would.

Nickw
_________________
"It's not what people know, it's that they know so much that just ain't so!" (Apologies to Will Rogers)
93 K1100LT
(2) 79 Suzuki GS850's (In limbo)
65 Triumph TR6S/C ( sold)
2009 Suzuki SV650
2009 Suzuki DL650

Scott_Anderson · Posted: Mon May 16, 2011 10:16 pm Post subject:

Nick, the next time you hear it try and open the top of the filler cap and see if that relieves it.
Like Steve suggested it could be a vacuum lock in the tank not venting.
Another possibility could be the fuel system pressure bleeding off. The system runs around 35-42 psi pressure. It could be leaking back thru the fuel pump where it's not supposed to, or the fuel pressure regulator could be releasing it back to the tank.

I can't say as I have heard either of mine make any noise after I turn it off. I have had the usual pump whine when low of fuel.
_________________
Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

nickw · Posted: Sat May 21, 2011 9:10 pm Post subject: Nailed it!

Scott;

You hit the nail with your suggestion. I got between raindrops yesterday and when the ride ended, I waited to shut the engine off until I was in a position to quickly open the filler cap. The noise quit abruptly with a rush of air (in or out). All I have to do now is trace through the ventery stuff and find out what's going on.

Thanks for the help, guys.

Nickw
_________________
"It's not what people know, it's that they know so much that just ain't so!" (Apologies to Will Rogers)
93 K1100LT
(2) 79 Suzuki GS850's (In limbo)
65 Triumph TR6S/C ( sold)
2009 Suzuki SV650
2009 Suzuki DL650

Jim · Posted: Sat May 21, 2011 10:43 pm Post subject: Tank noise

Nick - the tank has two vent tubes/nipples at the right rear. One is the rain drain - the hole to the left side of the filler cap. The other is the tank vent - I forget which is which. If you still have hoses connected to the drain and the vent, you could have nothing worse than a kinked hose.

The hose that is routed to the front of the engine may have a small, gray check valve - if it does, you can remove that.

If the hoses aren't connected, and you have an air accumulator, the culprit is something else - but very likely vent related.

If you don't have an air accumulator, the best thing to do is install one, cap off the nipple on the front of the engine, and have one tube from the accumulator that comes out at the back of and just below the right peg plate.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."