Sometimes a loose exhaust flange makes a whistling sound under acceleration.
Sometimes the fuel pump makes a whistling sound but that would normally be drowned out by the engine noise.

Is the noise new or has it been like that since you bought it?

 

Thank you for your answer. This sound is present since i bought it. When im driving it in 4th gear i cannot hear it. But when throttling in 1st and 2nd gear i can hear the sound.

Should i be concerned or is this normal.

Thanks in advance

 

Did you buy the bike new or used? Does it have the stock intake or aftermarket? My bike makes a similar sound on acceleration, typically through 1st as it's more noticeable, because I have an aftermarket intake and you can hear the intake pulling air through.

Sent from my SM-N960U using Tapatalk

 

I have recorded the video in order to hear the sound engine makes

bike is new -500 km

 

Any Bobber must still be under warranty, I think they only appeared late in 2017. I'd take it to the dealer to have the service people check it out if it's worrying you.

The sound in the video sounds like the same mechanical sound my Scout made. An exhaust whistle it a lot more breathy.

 

I have recorded the video in order to hear the sound engine makes

bike is new -500 km

 

Sounds like the geared primary to me..

 

Exactly.

 

The scout engines has a geared primary set up, rather that chain or belt as was more common in the past.
The geared set up, is far superior, with the exception of noise. Though for some, (like me) I enjoy the sound of that superior engineering.
They are straight cut gears which tends to be noisy..
It's advantages are less drive line slack, less maintenance (none) more accurate timing and other engine control aspects and riding aspects. (see less slack). And also easier for tear down if needed for any reason. It also opens up the engine for better accessory drive, such as smaller water pumps and that stuff, with the added benefit of smaller over all packaging and significantly less drive line power sapping of chains and especially belts.. so if all those things don't make that sound you hear a sweet sound, as it does me, think of it a gnarly hot rod with timing gear, and supercharger whine!

 

That sounds normal to me.

 

Valve Timing Gear.
It is ok.
And.... it sounds like the old Side Valve Scout, what of course is a great homage too.

 

Normal, I like the gear drive sound

 

My 2016 makes the same loud sound. Some are not as whiny but it is normal. I think my windshield amplifies the sound towards me.