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Author Topic: Baby Stihl  (Read 712 times)

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Offline JBS 181

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Baby Stihl
« on: December 30, 2018, 02:21:35 PM »
 Have a little branch cutter Stihl. I believe it is an ms170. Runs great cutting, but will not idle in normal or cutting position. Horizontal. It will idle when saw is tipped vertical. Nose of bar pointing at ground. Where might I start examining  saw first for idle problem. Saw is around 5 years old. Thanks.

Offline sawguy21

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Re: Baby Stihl
« Reply #1 on: December 30, 2018, 02:58:10 PM »
Check the fuel line and impulse line for cracks.
old age and treachery will always overcome youth and enthusiasm

Offline thecfarm

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Re: Baby Stihl
« Reply #2 on: December 30, 2018, 07:37:39 PM »
I am no expert. But I would be concerned about that sucking air and running on the lean side. :o
Model 6020-20hp Manual Thomas bandsaw,TC40A 4wd 40 hp New Holland tractor, 450 Norse Winch, Heatmor 400 OWB,YCC 1978-79

Offline joe_indi

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Re: Baby Stihl
« Reply #3 on: January 01, 2019, 04:19:50 AM »
Though it could be a fuel hose gone stiff, symptoms  are similar when the jet valve in the carb does not seal properly. This causes air to enter the metering chamber thus leaning out the fuel

Offline Pulphook

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Re: Baby Stihl
« Reply #4 on: January 01, 2019, 07:46:27 AM »
All the above , and : fuel filter, fuel tank vent ( in the saw ), change and/or regap & clean plug.
Since I'm dumb. look for simple fixes.
My 170 is the "emergency" saw when the others don't work or are stuck. Stihl made it for "the girls" :D : light, easy to run and start.
Thanks to the brain who suggested using canola oil for the bar in the boss however didn't like it. :-[
Two wood stoves ( Jotul Rangely ,Jotul Oslo ) heating 99 44/100%
24/7. No central heat. 6-8 cords firewood from the woodlot /year. Low low tech: ATV with trailer, 3 saws, 2 electric splitters, a worn pulphook, peavy, climbing line for skidding, Fiskars 27, an old back getting older.

Offline Air Lad

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Re: Baby Stihl
« Reply #5 on: January 09, 2019, 02:27:38 AM »
They also have a plastic band to help hold the boot to cylinder head,
a hose clamp would do better. Also the spark arrestors get clogged and give bogging issues. A mate gave me one he had melted piston. I fixed it up and it's one handy little saw.
Good luck with it
Ms 170/260c /039...Husk 142e/240e...Unloved Chinese 51.2cc that hasn't done anything wrong...2 x dead Mculloch's ..Vintage Poulan.. and a vintage Echo that still runs beaut

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