Question about Troy Bilt Tb70ss Gas Trimmer

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My tb70ss will start and run for 2 to 3 minutes and then stops. It also smoke fairly heavly. Any idea why it will only run for a few minutes? Matt

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Hi Matt and welcome to FixYa. I am Kelly.
Often when an engine only runs for a few minutes there is a restriction in the fuel supply or it is getting air into the system.

This little bugger is the biggest reason they draw air:
http://www.ereplacementparts.com/primer-and-hose-assembly-pi-282388.html?osCsid=1nn68dg2edk4v9o8lkr05c01j5

Check the hose for cracks / leaks and the bulb for pin holes. If your seeing air in the bulb as you depress and let go of the bulb you can be sure there is a problem in the hose or bulb.

Other sources for restrictions can be the outlet in
the bottom of the fuel tank, or a pinched hose.

The smoke is a result of the fuel mixture have a tad bit too much oil in it. That should not be a major concern at this point. It can eventually fowl the spark plug.

Your parts can be found here:

http://images.google.com/imgres?imgurl=http://www.ereplacementparts.com/images/mtd/TB70SS_(41CDT70C966)_WW_1.gif&imgrefurl=http://www.ereplacementparts.com/troybilt-tb70ss-41cdt70c966-trimmer-parts-c-26780_27267_27466.html&usg=__9rYYLlYdGqyBZHiwd1INaGkXhU8=&h=764&w=590&sz=22&hl=en&start=1&um=1&itbs=1&tbnid=-gNDJFORNOLfVM:&tbnh=142&tbnw=110&prev=/images%3Fq%3DTroy-bilt%2BTB70%2B%2522Engine%2522%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-ph%26tbs%3Disch:1

Thanks for using FixYa.

Kelly

Posted on Apr 29, 2010

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