Question about Troy Bilt Tb70ss Gas Trimmer

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My gas trimmer starts but wont stay running

I can get it to start but it shakes and wont stay running when i put the choke in the third position

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  • 316 Answers

Hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, !!

Posted on Feb 20, 2012

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Posted on Jan 02, 2017

vincob
  • 718 Answers

SOURCE: TROY BILT TB 70 TRIMMER-NEW

If you rebuilt the carb did you turn any of the screws on the carb while cleaning or take out, you might have just the low idle screw closed a little to much open half turn and see what happens. If you look at the carb where needle screws are located on the side,if you have two screws it will be stamped with an " L " and?or an " H " next to each screw. If you only have one screw then turn that one, to left to get more fuel. Good Luck...

Posted on Aug 27, 2011

  • 16 Answers

SOURCE: troy bilt 4 cycle string trimmer wont stay running

If this is an old unit, then the diaphragm is probably hardened.

Tests before hand would be:
1. Is the gas fresh and water free?
2. Is the spark-plug clean and snugly fastened?
3. Are you using the correct gas to oil mix ratio in your fuel?
4. yes...yes...yes...= bad diaphragm. Probably less than $5 for the part and a 1/2 hour to replace the part.

Posted on Jul 07, 2009

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