Whining

[TurboR]

Yesterday, I fired up the bike, and for the first time since owning it I noticed a high pitched whine. I've never heard this before. It kinda sounds like when the fuel pump primes itself only constantly.

It was in the 90s yesterday for the first time.

I read about FMU whine, but does this mean mine is on the way out?

 

[megawatt]

Nope it doesn't. Mine does it every now and then. Most of the time I turn the bike off and restart and it goes away.

 

[TurboR]

Nope it doesn't. Mine does it every now and then. Most of the time I turn the bike off and restart and it goes away.

Alright, just wanna make sure my baby isn't starved for fuel or something. I need to invest in a fuel pressure gauge that's actually visible like my boost gauge.

 

[POWERHOUSE]

Yesterday, I fired up the bike, and for the first time since owning it I noticed a high pitched whine. I've never heard this before. It kinda sounds like when the fuel pump primes itself only constantly.

It was in the 90s yesterday for the first time.

I read about FMU whine, but does this mean mine is on the way out?

If it is the dreaded FMU whine - and it continues - you need to take it apart, lubricate the piston shaft with never seize, put it back together and go do a wheely!

 

[twotonevert]

Is it a whine or a whistle? Like this?

https://www.hayabusa.org/forum/gene...y-does-my-bike-whistle-video-inside-help.html

 

[TurboR]

If it is the dreaded FMU whine - and it continues - you need to take it apart, lubricate the piston shaft with never seize, put it back together and go do a wheely!

Thanks for the info as always... I believe that this may be my issue. If so I'll give it a day or two and tackle the job on the weekend. Will my tune be thrown out of whack by taking this apart?

Is it a whine or a whistle? Like this?

https://www.hayabusa.org/forum/gene...y-does-my-bike-whistle-video-inside-help.html

Nah,
Mine doesn't sound anything like that. It's more a powerline / electrical transformer hum.

 

[megawatt]

Get the fuel pressure gage first, know what pressure your flowing before you take the FMU apart. Once you change the pressure it can change the tune.

 

[POWERHOUSE]

Get the fuel pressure gage first, know what pressure your flowing before you take the FMU apart. Once you change the pressure it can change the tune.

Absolutely - check your idling fuel pressure - make sure the FMU is returned to this exact number; also, check your bleed screw - see how many turns "out" it is - make sure it stays there!