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1985 KDX200 only giving half power

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Bought the bike, worked fine for 2 weeks. Power started decreasing, so I put a new spark in it and it went back to normal for 2 hours before returning bad. Changed the spark again and it didn't fix the problem this time. The bike has almost no power in the first 3 gears, only 4th and up have some power. It also takes longer to hit the power-band.

Could this be jetting, and if so, what do I need to do/buy?

Seems to run correctly only when it's about to run out of gas.

Thanks!

Edited by Ririguy7
forgot to add something

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