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Discussion Starter · #1 · (Edited)
Was riding down the highway at about 80mph and then out of nowhere i started losing power. was hard to maintain highway speeds. Pulled off and then i started hearing loud rattling noises. Most of the power was gone. It starts up fine and idle fine, but as soon as you hit the throttle the knocking/rattling begins. Could really use some help thank you. Im going to insert a video of the bike and noise.

"2012 NINJA 250 engine noise" youtube link = https://www.youtube.com/watch?v=_jqqTrmW318
 

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Given the nature of your problem, I think you need an on-site, real mechanic to look at it.
You may have dropped a valve or spun a bearing.

While others might disagree, I don't think the little machine was REALLY made to be flying down the freeway at 80 all the time anyway.
 
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