1984 Honda xr250r running shitty

got a 1984 honda xr250r.  runs and drives.  you can rev it up a little bit but when give a good amount of throttle it dies down.  almost like it hit a rev limiter or something (only way to describe it).  This bike was fast used to do prolly 80 mph+ no i can only get like 30mph out of it.  Anyone know what it could be ?  

Was it sitting and not ridden for a long time?

Dirty carb

it wasnt sitting it driving one day and it happened the next

Check spark , fuel flow , clean carb and check valve clearances

You can do a leak down test to confirm compression

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