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K100-forum.com » Technical, repair and troubleshooting » Trying to figure out this whining noise

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jjfishing

jjfishing
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87 k100 sounds normal at start up but after about 1 to 2 minute of idle this whining noise gets much louder. It seems like it's coming from under the fuel tank, and seems way too loud to be normal. I'm new to the bike so I'm not sure of the history. The low fuel light is stuck on, which is on my list of repairs, but it has about a half tank of gas. Not sure if that could be contributing.  Once the noise starts it stays consistent if the bike is idling or reving until it's shut off. If anyone has any ideas I would really appreciate it. I tried to upload a video but was unable to.

    

92KK 84WW Olaf

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Fuel pump, the make that noise. Especially if there isn't much gas in the tank. Tank still looks half full after that light comes on. Fill the tank, zero the trip meter and ride it.

As its a new bike to you a wisdom to get a spare fuel pump and filter and have it in your shed.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

jjfishing

jjfishing
active member
active member
92KK 84WW Olaf wrote:Fuel pump, the make that noise. Especially if there isn't much gas in the tank. Tank still looks half full after that light comes on. Fill the tank, zero the trip meter and ride it.

As its a new bike to you a wisdom to get a spare fuel pump and filter and have it in your shed.
Thanks, I'll do that.

    

yamaguzzi

yamaguzzi
Life time member
Life time member
Mine made that noise after getting low on fuel for a while then it started blowing the fuse to the fuel pump circuit.I replaced the pump and filter ,the noise is gone and I'm not blowing fuses.I'm on my third tank of fuel since the repair and all is well .Be ready to replace that pump before you go too far from home on the bike


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

jjfishing

jjfishing
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Thanks for the advice, I will.

    

Laitch

Laitch
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Life time member
jjfishing wrote:I tried to upload a video but was unable to.
Upload the video to YouTube then copy the video's link into the box that comes up when you click the YouTube icon in the toolbar above the message box you use when you make a post.


__________________________________________________
1995 K75 90,000 miles
    

jjfishing

jjfishing
active member
active member
Gotcha. I'm going to do that.

    

8Back to top Go down   Trying to figure out this whining noise Empty Video Mon Jun 21, 2021 7:40 pm

jjfishing

jjfishing
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active member

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Find a way to carry the spare fuel pump with you. The one on the bike will then last forever.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Laitch

Laitch
Life time member
Life time member
That's annoying, all right. Laughing  If you had opened the fuel tank cap while floating the camera, we might have experienced Surround Sound.


__________________________________________________
1995 K75 90,000 miles
    

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