Help! Need to clean carb on bike that has been sitting over a year!

Hey guys, I have a predicament. I've got my YZ tore down right now for a rebuild. A friend I was talking to said if I could crank his 04 YZF I could ride it. Here is the problem it has been sitting for close to a year and a half in their garage. They basically bought it on accident, and then have always wanted to high of a price to sell it. Anyways, gas is flowing through the fuel line but I don't think it is getting to the motor, it also want flood and leak out of the bottom when leaned over. I'm taking the carb off now but don't know what to look for, I have never let mine set over a couple weeks with fuel in the carb. So really have never had to clean a carb, I've took them apart just not sure how to trouble shoot them I guess. Any help would be appreciated. Thanks in advance guys!:eek:

Hey guys, I have a predicament. I've got my YZ tore down right now for a rebuild. A friend I was talking to said if I could crank his 04 YZF I could ride it. Here is the problem it has been sitting for close to a year and a half in their garage. They basically bought it on accident, and then have always wanted to high of a price to sell it. Anyways, gas is flowing through the fuel line but I don't think it is getting to the motor, it also want flood and leak out of the bottom when leaned over. I'm taking the carb off now but don't know what to look for, I have never let mine set over a couple weeks with fuel in the carb. So really have never had to clean a carb, I've took them apart just not sure how to trouble shoot them I guess. Any help would be appreciated. Thanks in advance guys!:eek:

You will most likely need to replace the needle valve . They get eaten up by this great gas we have. The needle is located just above the floats. You need to remove the pin that the float pivots on. and the needle will come out with the floats as it is connected by a small clip retainer. Clean the rest of the carb with air and carb cleaner. Hope this helps. I'm sure there are other guys here that have even better info on this procedure then me.

I just bought an 04 YS-F 450 with the same problem.

i had the same problem with a yz450 i just bought recently. the bike was running gross.

i took it apart, removed the jets, floats, needle valve, throttle valve etc. and went to it with carb cleaner and compressed air. i had a small container for the parts and had them sitting in carb cleaner as i was cleaning, use the straw on the carb cleaner to get every orifice you can find followed by compressed air. don't be shy with the stuff, i cleaned everything multiply times before putting it back together. works great now. it even idles lol just make sure not to soak any rubber o-rings in the carb cleaner, it will destroy them.

you may not even need to troubleshoot right away, sometimes a good cleaning is all thats needed. if still no luck after the cleaning, lots of guys on here will be able to tell you what to do next

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