Losing power when I pull throttle all the way

[Matty MT]

Hi can sombody help me pls, I know bits about bike but I am stuck, I have had my Yamaha mt125 2016 for 2 months, but from new I didn't spot it because I was tryin to run it in correctly, but on the odd accessions I didn't, I found if I ease the throttle all the way to top rpm every thing is fine. But if I ease the throttle up mid rpm range then pull the throttle all the way, the engine makes a dull pitched noise, and I lose power.. Then I let go of the throttle and pull it again, then I can feel the power, can anybody help please thanks
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Matthew christian

[Wafer_Thin_Ham]

Still under warranty? Take it back to the dealer.
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[Matty MT]

It's goin in for its 600 miles service on Wednesday, hopefully they can fix it, it's jus I am too impatient lol, and if was an easy fix I would like to fix it myself, and I would like to know what the problem is so I could tell the mechanics in the dealership to get to the problem faster, and thank u for the fast reply
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Matthew christian

[Wafer_Thin_Ham]

[MCN]

I don't know what is fitted to that bike but....

AN issue for some 'modern' bikes is when the battery is disconnected the ECM 'can' lose the information for where the min-max is for the Throttle. The procedure is:
Ignition on.
Do not start the engine.
Throttle all the way open.
Return to zero.
Off Ignition.
Ignition on and start.

That's on Fly-by-wire systems your bike may have a more simple mechanical cable.

If in doubt dealer-ise it.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Ichy]

[Matty MT]

Thanks for all the advice guys, like I sed its goin in for its 600 mile service in a few day so I will let them know, it's jus always in the back of my mind wanting to know what it is, I will keep used informed on the problem when I find out thanks guys
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Matthew christian