older dirt bike, engines making weird noises?

The Smart Guy

New member
its a two stroke BTW
This older bike we just got the engine started 3 days ago, been riding it for a while, now sometimes when we ride it and give it more then 50% throttle the engine sounds like its bogging down and then theres sort of a chugging noise coming from the muffler, letting up on the throttle stops it, but if i go back 50% again it will happen again

any ideas on the causes? and a remedy to fix it?
 
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