Question about Homelite ZR10926 16" Chain Saw

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Chainsaw will start then start smoking then shut off. What could be causing this not to keep running?

Posted by gilvallo on

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Andrew White

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  • Homelite Master
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There is only one reason for excessive smoke from the exhaust, and that is because it is burning oil, and the oil can only come from the petrol ,so you need to refill the fuel tank with a fresh fuel/oil mix good quaility oil at 50-1 and try again. Is it possible you may have put chain oil with the fuel, or put it in the fuel tank rather than the oil tank?

Posted on Feb 10, 2011

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stug_57u

Stuart

  • 99 Answers

SOURCE: chainsaw won't keep running except on full throttle?

Running at full throttle but not at idle would probably be caused by not enough air getting through to the cylinder with the fuel. This could be caused by blocked/dirty air filter, air leak or worn/damaged piston or cylinder. The higher the revs are the less air to fuel ratio is needed so it will run at these speeds. First check your air filter, if that is fine take the spark plug out and examine the inside of the cylinder. You will need to check here with the piston down. If you want to be a bit more thorough you can remove the exhaust and check the piston face and inside the cylinder from here aswell. You don't want to see any scoring or solid lumps of anything in here. While you have the exhaust off give it a few firm taps to make sure there is no major carbon build up and clean the spark arrestor if it has one. The arrestor is normally a small gause found on or near the exaust outlet pipe. If that all seems fine then get some soapy water and squirt it around the carb gaskets and pipe that runs from the carb to the cylinder. If you see bubbles appearing here when the machine is running then you have air escaping and it will need investigating. Failing this you could have worn piston rings or crank seals. Ideally to test this area you need proper pressure testing equipment.

Posted on Oct 27, 2008

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Anonymous

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SOURCE: chainsaw carburetion

Had a similar sounding problem with my stihl MS 250. After two years of heavy and frequent use (with minimal maintenance) it ran perfectly but after three years of little use with no maintenance it began to die if the revs were allowed to drop, ie it wouldn't idle. I hadn't been draining the tank when not in use so assumed a carb gunk problem. Can also be caused by an oily mix or old fuel.

Today I removed the old fuel and fuel filter and sprayed the tank and up the fuel line with carb cleaner. Then I removed the spark plug and filled the chamber with carb cleaner (use a straw to direct), I removed the air filter and sprayed carb cleaner in here too. I gently pulled the starter cord a few times to spread the carb cleaner. I left it for 1/2 hour while I had lunch.

I then rinsed out the fuel tank with fresh fuel, renewed the air filter, spark plug, fuel filter and fuel. I checked the H and L screws were in the right place (they were), before pulling on the starter a few times to prime / flood the chamber. I then removed the spark plug for 5 mins and had a cup of tea while the flooded chamber resolved / evaporated, then fired her up. It worked well all afternoon.

No need for any tricky or delicate stuff if you give this a go first is my advice. Cost only of spark plug, air and fuel filters, fresh 2" mix and a can of carb cleaner. Took less than an hour excluding interruptions. Saved a potentially expensive trip to the shop where I'd have been billed for these parts as a routine matter.

Posted on Jan 02, 2009

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