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Old 06-24-2015, 10:25 AM   #1
SideVinder650
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2008 - SV650n - Whining from Electrical System/Fuel Pump?

Hi guys, I tried to post this over at SVrider.com forums but i didnt get much help there, and Im dealing with this strange whining sound coming from the bike.

When I first turn it on the bike whines like this at idle/ any amount of throttle, after it warms up the whine goes away at idle but is still persistent through any amount of throttle higher than idle (~1100-1400 rpm)

The bike just came out of "Winter" storage and the only thing i did different this year as opposed to years prior was i put a little bit of seafoam in the tank maybe 1/16-1/8 of a bottle, not very much, with a full tank of gas. The bike sat for 3-4 months and i have run a tank or two of gas through it since then but havent really ridden it too much. Maybe it will go away after being ridden more?

It seems like after starting up the first time after winter it did not make this noise, halfway into the first or second ride i had to re-fuel and after topping it off thats when this whine started occuring. It might be battery related and seems to oscillate pitches from high to slightly lower when i turn on the blinker.

I wish i had a spare battery to try and rule out whether its the battery or not.

ALthough, in the past, when I have had a low battery its never done this before, so i dont think its the battery. (if thats any way of properly ruling it out)

Any help is greatly appreciated,
Thanks for looking.

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Old 06-24-2015, 12:26 PM   #2
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Wow that is weird. U can try disconnecting the fuel pump while it running to see if stops. The bike should run on the residual fuel for a few seconds.but it should be enough time to see if that squeeking stops.
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Old 06-24-2015, 05:02 PM   #3
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I suppose thats what i'll try next. If that does/doesnt work it seems like the bike is right around the 40,000 mile mark which is when most folks do a fuel pump cleaning anyways,so it couldnt hurt to take it out and remove the garbage out of it
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Old 06-24-2015, 05:21 PM   #4
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Old 06-24-2015, 05:24 PM   #5
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Old 06-25-2015, 09:47 AM   #6
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Thanks Patrick, I'll be sure to check those as well, first
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Old 07-09-2015, 09:56 AM   #7
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Thanks for the help guys, turns out it was NOT The seafoam that caused this, the more likely culprit is the large amounts of rain/water that have splashed on my bike. compounded by the fact that i've had to store it outside, and it was uncovered.

So, 3 months ago, I cleaned the out of the bottom part of the gas cap, since it is a lock actuated cap the bottom portion had calcium build up on the lock and would make the lock very sticky almost twisting and breaking your key off in the sumbitch.

After thoroughly cleaning it with emery cloth and i think even a mild steel brush it worked excellent, however, after leaving it out in the rain, the calcium came back with a vengenace, in the 3 months that it was raining it had build up more calcium than it had in the 5 or 6 years that i've owned the bike.

So much so that the gas cap wouldnt even come off, when i pryed it open it was almost "hairy" with this white chalky calcium build up.

I think this buildup is what was causing the pump to whine, after i cleaned that sh*t off and filled up the tank with good gas and shook the heck out of it, the whine went away immediatley.
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