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just bought kdx 250 now it bogs

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i purchased a 1994 kdx 250 when i took it for a test ride it bogged a little bit at low rpms and then really got going i was surprised at how fast it was, now after 2 days of riding it it bogs and doesnt really climb the rpms so instantly like it did before, i cleaned the carb and changed the plug and it still bogs, it only has 3 tanks of gas though the rebuild i was thinking since to break it in they mixed it 10-1 it mighta clogged the carb but that wasnt it??? im stumped i had this same problem on my kdx 80 after it got rebuilt and never figured it out

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2 strokes are so cheap and easy to rebuild, that I generally consider that part of my "tune up" when I buy a used 2 stroke bike.

throw a new piston/rings and new set of reeds in.

Check the float level in the carb, make sure there are no blockages in the fuel flow from the gas tank.

If this bike has a powervalve, make sure that it is operating freely.

it should run like a top if all those things are done and in working order.

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