Does anyone know why my bike is doing this?

[Huzo]

Just give me 1 minute of your lives, watch this and listen to what it does @ the 20 second mark..
https://youtu.be/Li8qvFVuAJ8
Is our OP’s bike the same ?
It then settles into a perfect idle..(and it’s not as loud as it sounds on video).

[Kev m]

Just give me 1 minute of your lives, watch this and listen to what it does @ the 20 second mark..
https://youtu.be/Li8qvFVuAJ8
Is our OP’s bike the same ?
It then settles into a perfect idle..(and it’s not as loud as it sounds on video).

OP will have to answer for himself (though I think his video sounds very similar).

I'll say YES, that sounds almost identical to what my 2013 does on most cold starts (and that my 2018 has NEVER done).


Follow up question - if you attempt to ride away when it's doing that, what happens?

[Huzo]

Ummm, I don’t know Kev but next time I can I will.
I can tell you that a blip on the throttle will override the symptom as it’s occurring.

[Kev m]

Ummm, I don’t know Kev but next time I can I will.
I can tell you that a blip on the throttle will override the symptom as it’s occurring.

When this occurs on mine you can try to throttle out of it, but the second you slip the clutch and apply any load it will die.

[Huzo]

When this occurs on mine you can try to throttle out of it, but the second you slip the clutch and apply any load it will die.

Ok.
By the time I’ve put my gloves on and closed the garage door, it’s perfect.

[Kev m]

Ok.
By the time I’ve put my gloves on and closed the garage door, it’s perfect.

Could be similar.... I've got gravel so I have not done that and I'm seated by the time I start it. 

[lucky phil]

Just give me 1 minute of your lives, watch this and listen to what it does @ the 20 second mark..
https://youtu.be/Li8qvFVuAJ8
Is our OP’s bike the same ?
It then settles into a perfect idle..(and it’s not as loud as it sounds on video).

I'll tell you what that is, it's caused by fuel puddling in the inlet manifolds with a rich start mixture and a cold engine. So the fuel puddles and periodically the engine sucks it in and goes rich and stumbles. Once the engine gets some temp into it and the manifolds heat up and the fuel stops puddling and the cold engine and start trim leans out a little they settle down. Giving the throttle a quick twist to keep it going just adds fuel and doesn't help. My V10 Sport does it as well and having the high idle lever set at a slightly higher rpm helps until it's warmed up a little.

Phil

[tris]

Just give me 1 minute of your lives, watch this and listen to what it does @ the 20 second mark..
https://youtu.be/Li8qvFVuAJ8
Is our OP’s bike the same ?
It then settles into a perfect idle..(and it’s not as loud as it sounds on video).

Sounds like my V9.

Start bike and lid and gloves on all good

[Huzo]

I'll tell you what that is, it's caused by fuel puddling in the inlet manifolds with a rich start mixture and a cold engine. So the fuel puddles and periodically the engine sucks it in and goes rich and stumbles. Once the engine gets some temp into it and the manifolds heat up and the fuel stops puddling and the cold engine and start trim leans out a little they settle down. Giving the throttle a quick twist to keep it going just adds fuel and doesn't help. My V10 Sport does it as well and having the high idle lever set at a slightly higher rpm helps until it's warmed up a little.

Phil

Thanks for that Phil.
I didn’t know what it was.

[Kev m]

I'll tell you what that is, it's caused by fuel puddling in the inlet manifolds with a rich start mixture and a cold engine. So the fuel puddles and periodically the engine sucks it in and goes rich and stumbles. Once the engine gets some temp into it and the manifolds heat up and the fuel stops puddling and the cold engine and start trim leans out a little they settle down. Giving the throttle a quick twist to keep it going just adds fuel and doesn't help. My V10 Sport does it as well and having the high idle lever set at a slightly higher rpm helps until it's warmed up a little.

Phil

  that makes sense...