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2006 kx250f problems

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2006 kx250f i would like too know how can i tell if my head gasket is blown besides doing a leak down taste an or taking the head off? If the bike idle or ride slow too long water and smoke comes out the radiator over flow hose. And jetting too bike is bone stock beside the Athena 290cc kit would i really have to adjust the jetting or would it be fine with stock if not would i have too lean it out or rich it out???

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Well, any four stroke that idles for a bit or going to slow will haven't coolant coming out, but I'm not sure about smoke. If it's white, which I'm sure it is, it's burning it somewhere, but maybe just inside the radiators from being too hot.

If you think it might be blown, just replace it for piece of mind and you can get a look at your valves and piston.

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Im sure you would need to rejet with a 290 kit but also depends on the altitude. 

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