Question about 2004 kawasaki KX 250 F

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Hard to start and back fires alot when it does run

Any suggestions

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This could be a blocked jet in the carb,,ie running week, try striping card and cleaning it out,,dont go poking wire into any jets you will distroy them,,

Posted on May 05, 2010

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rselvy
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SOURCE: 2002 crf450, rough running, back firing, hard start

Classic valve train issues. Sounds like the valves are tight. One thing that concerns me is the "sudden onset". Valves usually tighten over time.
Make sure you also tighten the cam chain as well.

Posted on Dec 27, 2008

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Leaking gas by carb


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Hard starting, turns over fine it just cranks alot before it fires up.


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Thanks,
Lee

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1 Answer

Bike sits a lot,Hard to start, will only continue to run with choke on. Bike backfires alot.


You need to clean your carburetors. The ethanol that is in gasoline turns to an orange colored film
and it clogs the jets. The prevention for this seems to be seafoam added to your gasoline after your carbs are clean.
It does work. If your bike sits a lot, i would also suggest that you start it up weekly and let it warm up. Sitting is the worse thing for gasoline.
Judging from your description and other problems, the backfire is probably bad gas not burning and igniting in the cylinder when overloaded with gas.
A good carb cleaning, consists of taking the carbs off the bike, taking out all the jets and soaking everything in a good carb solution.
I would start with the carb cleaning, drain the old gas out of the tank, start with fresh 93 octane and add the recommended dose of seafoam listed on the back of the botlle to your gasoline.
Put a set of new spark plugs in it, and fire it up.
Your back fire should be gone as well.

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Hard start and stalling with back fire when give it gas fast


sounds like you have spark plugs mixed up ever had them replaced

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