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Cfr50 fuel valve and air filter

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Hi. I just picked up an 04 crf50 for my kids that has very little hours on it. The petcock is leaking even when in the off position. Is this a common problem? Is there a better quality fuel valve available or a rebuild kit for the OEM valve? Also it needs a new air filter. The stock one seems pretty cheap. Are the aftermarket filters for the stock air box any better?

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I store all my bikes without gas and when I add gas for the first time at the start of the season, it's not uncommon for at least one of the petcocks to leak a little until the seals have had a chance to swell.  After a few hours, the leaking stops.

 

Is the leak from the petcock or from the petcock/tank interface?  There an o-ring that seals the petcock to the tank and that seal is cheap.

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No it is leaking from the petcock. I had gas in it for a day and it just kept leaking. Has anyone ever tried to drill out the rivets in the faceplate of he petcock and try and rebuild it?

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I'm having the same issue with my sons 2008 crf50. Does the tank need to be removed to replace the petcock valve or can it be done in place?

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I'm having the same issue with my sons 2008 crf50. Does the tank need to be removed to replace the petcock valve or can it be done in place?

I think it can be done in place, but life sure would be a lot easier with it off.

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