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2004 Honda crf250r hard to start, Its not the valves. Carb issue

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My 2004 Honda crf250r will start fine if I drain the float bowl then kick it over but after I shut it off and let it sit for 15 minutes and try to start it it wont fire and the plug is wet and its getting spark. It acts like it flooding???

 

I just adjusted the valves and triple checked them. they are good. I also took the carb off and cleaned the float bowl and put a new bowl gasket on. the float bowl drain plug also has a new gasket (o-ring).

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You might need to either adjust the float level or more likely need to clean or replace the float valve. It sounds like the carb float is not fully closing the valve... could be debris blocking the valve or the rubber might be cracked and old.

Not sure what the crf carb looks like but also check that the vent and overflow tubes are connected properly. I had the same issue with my xr250 because I connected the vent to the overflow like a moron. Disconnected it and it fired up on the first kick

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I removed the carb to go through it completely. I checked and adjusted the float level. I was thinking the same thing. The float valve is new. One thing I found was the acceleration pump diaphragm had cracked and splits around it. I'm thinking this could be the problem. Thanks for answering If you have any more suggestions I'm all ears but Im going to get a new acceleration pump diaphragm in the next few days.

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The acc pump shouldnt stop it from starting, it will probably have a bog when you whack the throttle though. I have had the same issue I think, seems like its flooding, same year bike. Make sure there is some play in your throttle cable and like jwap said make sure the float works properly.

What is your starting procedure?

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Did you check the float valve seat when installing the new float valve?  There could be old crap stuck up in there that is preventing the new valve from seating fully.  One thing to try is when you have the carb off is take off the bowl but leave the float on.  You can blow air using your mouth through the fuel line and use your finger to lift and lower the float. You should be able to blow some air through when the float is lowered but not at all when the float is lifted.  

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The float is working properly and the float valve seat is seating properly. I blew air through the fuel line and pushed the float up slowly and it sealed off the air I was blowing. I'll make sure there is a proper amount of play in the throttle cable when I put the carb back on. I should be getting the APD today. Thanks I'll keep you guys posted. Keep the suggestions coming I appreciate your help.

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I replaced the accelerator pump diaphragm, spring and o-rings tonight and adjusted the float height, went through the entire carb checking and cleaning everything. Put it back together and it started and ran like a democrat from the truth!  :thumbsup:. Thanks for your suggestions and input. Thumpertalk rocks!

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