Question about Mtd 25B-520D200 CA Gas Lawn Edger

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I have a Zama diaphragm carb from a Troy bilt trimmer. Factory guy said repair seat or get a new carb. Some one knows how to do that task and I sure would appreciate the knowledge! Thanks nmiller1

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Either 2 or 4 screws on the bottom of carb, remove them and the cover and you will see needle and seat. Remove one screw and needle will come out, There is a small spring under needle idler arm, do not lose it...
Be sure to mark which fuel lines go where before removing carb.

Posted on Apr 29, 2010

Testimonial: "Thanks for the reply! I have seen the seat! The problem is,, how to refinish or polish the seat so it won't leak anymore. Maybe impossible,,, there s"

  • sunneyskies May 09, 2010

    I've never heard of reworking a needle seat. It would be a lot less agravation to just buy a new carberator, unless you just enjoy fooling around with this stuff. Errrrr, those carbs cost about 35 bucks.

  • sunneyskies May 16, 2010

    I had the very same problem. Here's what i did. I used a samll drill and by hand, turned it on the bottom of the seat untill i could see a shiney mark all the way around the seat. Kinda like polishing a valve in. This worked great for me, but i did have a larger carberator to work with. Go slow and only take enough out to see a shiney spot all the way around.

    I have no leaks, and saved 175 bucks for not having to buy a new carb.

    good luck


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