Maintenance & Technical > KX250 / KX125

kx 125 wont idle

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xmous3yx:
my 125 boggs out and wont idle. need some advice. i got carbon reeds and fmf gold.

sandblaster:
Hello.
What year is your bike and have you ran a compression test on it?

Wayfast1500:
It start hard? How's the plug look? When's it bog?  I'd be doing a plug, then a compression test, leak down test if compressions low (chances would be piston and rings but I've seen base gaskets leak and have this issue), clean carb.  Then if that doesn't help I'd look into the ignition system.

jonny500:
is this something that has just started happening, im am thinking piston/rings crank seal or air leak

DaveEngineering:
My best guess would be an air leak between the carb and cylinder. it would explain the bogging and idle problems.

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