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Snapper SS312 weed eater. Cranks when primed but won't run

Compression tested @ 90 psi. Ultrasonic cleaned carb. with cleaner.
Installed carb kit. Replaced carb to intake gasket. Checked reed valve.
Adjusted metering tab to Walbro specs. Carb type is Walbro WT.
Removed adjusting screws before cleaning carb. Replaced screen in carb. Noticed that primer bulb pumps up hard. All other similar carbs I have worked on, the primer bulb could be continously pumped without any hard resistance. Have tried adjusting screws in all imaginable position. Good spark. With adjusting screws closed almost completely off, motor will crank and run until prime fuel is consumed. The farther I open adjusting screws, the harder it is to crank. If I open them to 1 turn each, motor will not crank.

Any Suggestions besides buying another carb or weed eater?


Posted by rmac54 on

  • 1 more comment 
  • penraydylan1 Apr 09, 2009

    originally, when primmed fuel would pour out of carb. checked and found diaphram with hole in it. changed diaphram and now primmer button fills and then gets hard to push. any suggestions?

  • Anonymous May 11, 2010

    Have you visually inspected the piston and cylinder?
    Normally you need at least 110 psi.

  • Anonymous May 11, 2010

    hello mr r, sounds like to me you have the fuel lines switched around,this is the same thing that happened to me same problem,



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  • 109 Answers

I am sorry to say this, but the compression for that type of engine should be atleast 120 psi. Remove the muffler and look at the cylinder, it is scarred beyond repair.

Posted on Apr 22, 2009


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