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Somebody gave me a Craftsman lawnmower with a B&S 7 HP motor, YBSXS.1901VE 275078, because he couldn't get it started. I put gas in and it ran out of the primer bulb so I replaced the primer bulb. Now it's better but still leaking gas. I wouldn't assume there would be gas present in the bulb or at least some kind of check valve in place. I can't find a parts breakdown for this model to see what is in the carb. Can you give me some advice please?

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Under the carb is a metal bowl. This bowl houses the carbs float attached to a needle valve. This valve is probably stuck open due to corrosion or dirt blocking the opening. You can remove the bowl with a half inch wrench and lower the bowl from the carb. Let some gas flow out of the needle valve and work the float up and down to help clear out the obstruction.

Push up on the float and see if the fuel flow stops. If it does you can put the bowl back on and see if it stops flowing out the primer bulb.

If it is still flooding you probably need to replace the float, and needle and needle seat. These are pretty inexpensive you can order them online *(ebay might even have them!).

You might want to clean the main jet too. You should get this carbs diagram to show you where the main is located.

Posted on Jul 09, 2010

Testimonial: "Leaking stopped but mower still would not start. Soaked carb in Gunk & the bowl gasket stretched, have ordered an overhaul kit. Research showed the mower model as 917.377240 w/ motor 128602 0304 E1 w/ Walbro 214661 carb. Kit # 692703 or 792383 Thx"

  • john andrew manchook Jul 19, 2010

    get a float too! I see the rebuild kits dont have floats in them.



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