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Stihl ms170 chainsaw will not start

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dayleh
Join Date: Aug 2008
Posts: 5 Quaker City, ohio
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2008-08-24          156272


I had my chainsaw out last week and it started and ran great. I got it out this week and it wouldn't start, not even fire. I pulled the spark plug and cleaned it, no help, tried using starting fluid to start it but still no fire. I bought a new spark plug but still nothing. I held the spark plug against the top of the cylinder and turned it over. There is a small blue spark at the spark plug. I have also taken the carb. apart but it looks clean. Any ideas what I have missed??

thanks in advance for the help.
dayle


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Stihl ms170 chainsaw will not start

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kwschumm
Join Date: Feb 2003
Posts: 5764 NW Oregon
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2008-08-24          156273


Did you fill the tank with the same fuel you used last week? It sounds like old fuel or plugged fuel filter. ....

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Stihl ms170 chainsaw will not start

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kthompson
Join Date: Oct 2005
Posts: 5219 South Carolina
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2008-08-25          156283


Check the exhaust for insect clogging it. kt ....

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Stihl ms170 chainsaw will not start

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DennisCTB
Join Date: Nov 1998
Posts: 2647 NorthWest NJ
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2008-08-25          156284


Make sure you are using new gas.

Take the air cleaner off and pour 1 tablespoon of fuel into the carb with the plate open.

Try to start, repeat process as needed :)

If you get a bit of a start this way but it dies you know that the electrical is good.

Replace in tank hose and filter.

....

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Stihl ms170 chainsaw will not start

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dayleh
Join Date: Aug 2008
Posts: 5 Quaker City, ohio
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-08-26          156325


Ok

this was the same tank of gas that I used last time. I tool the muffler off before and cleaned the spark arrestor screen.
I have just tried putting gas directly into the carb. about three or four times but it still will not fire at all and the front of the muffler is wet with gas.

any other ideas?

thanks
dayle ....

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Stihl ms170 chainsaw will not start

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DennisCTB
Join Date: Nov 1998
Posts: 2647 NorthWest NJ
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2008-08-26          156327


After pouring the tablespoon of gas down the carb throat are you setting the throttle to choke or run? Try it on run instead of choke so you get more air. Spark, gas and air should equal explosion :)

Hard starting can be frustrating. ....

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Stihl ms170 chainsaw will not start

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Chief
Join Date: Jul 2003
Posts: 4285 Southwest MiddleTennessee
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2008-08-26          156334


I have a Stihl ST420 blower/sprayer do something like this when I first got it. Turns out the magneto/coilpack went bad. This could also be a problem with the mag pickup on the flywheel. The spark may be intermittent. If you tried ether, it should have at least sputtered if you had any spark. ....

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____________________________________________________________________________________
Stihl ms170 chainsaw will not start

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dayleh
Join Date: Aug 2008
Posts: 5 Quaker City, ohio
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-08-26          156338


I have tried both choke and run but neither made a difference. ....

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Stihl ms170 chainsaw will not start

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kthompson
Join Date: Oct 2005
Posts: 5219 South Carolina
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-08-27          156349


My chain saw is a Shindaiwa. It will not crack if has weak gas or gets flooded. If it were my chain saw I would drain out all gas and buy new gas and new oil mix if I had confidence in the spark being there. Check and see if you have any water in the gas. Even fresh gas could. Never had any problem with our Stihl leaf blower execpt when insects blocked the exhaust ports. That machine will set for a couple of months between uses. Sometimes a reasonable shop fee is cheap. kt ....

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Stihl ms170 chainsaw will not start

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Justus
Join Date: Jun 2002
Posts: 179 Justus, Pa.
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2008-08-27          156354


Did you have the proper oil to gas mixture? ....

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Stihl ms170 chainsaw will not start

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dayleh
Join Date: Aug 2008
Posts: 5 Quaker City, ohio
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-08-27          156366


I have mixed new gas at the 50:1 ratio before trying any of the other stuff. ....

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Stihl ms170 chainsaw will not start

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
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2008-08-28          156381


Unlike many other brands, Stihls are sold only by shops that service them, so if all else fails you can bring it in. ....

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Stihl ms170 chainsaw will not start

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kthompson
Join Date: Oct 2005
Posts: 5219 South Carolina
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-08-29          156390


dayleh, based upon my own experience, if you have let your saw sit a day or so since last trying it, put in a new spark plug and then use the normal process to start it. Don't vary anything from the way it has always worked such as number of pulls with choke on or such. Has worked for me a few times. Sometimes having a problem we will change the way we have always started a engine and miss something as simple as switching it on or priming it. Last fall one of my son in laws borrowed my saw, after a couple of hours he came back with it and it will not start. Have pulled it and pulled it and will not even fire. I had used it just like you a few days ealier and no problem and I failed to start it also. Changed plug with no effect. Let it sit for a few hours and amazing it started and ran fine. I really believe you can get such a build up of fumes and oil in there some 2 cycle engines just need to air it out. Back in the days of carbs on car engines have seen that also.

Years ago one of my brother in laws and I were cutting fire wood. We stopped for refueling and his saw would not start. He pulled and pulled it and even when ask is it on, yep! I switch and it was off. He took my saw and pulled and pulled and failed to start it to which I asked again, if is off, yep! Humous as it could be he had pulled for several minutes on two different saws with both being switched off even when asked on each saw. Hate to say I have done the same also. ....

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Stihl ms170 chainsaw will not start

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Woodie
Join Date: Jun 2004
Posts: 104 Michigan lower
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-08-29          156405


My brother and I have run Stihl saws for about 20 years. "Knock on wood" - we have had only a few 'minor problems" but nothing to say major problems (spark plugs now and then,normal wear /tear items and once the saw stopped-somehow sawdust got builtup inside the clutch area and would not allow turn over). My saw is about 25 yrs old with 40:1 mix ratio and have used 87octane and have had not problems starting...my brother recent bought two newer models and has found-- The ONE BIG change is GAS! - Read the owners manual.. they call for Premimun grade for the mix... yes it makes a difference .. We were cutting with a friend who had a brand new one week old Stihl he refilled with a batch he made with regular 87 gas and his saw would not start. we dumped his mix out and refilled with the 'higrade mix' took abit to work it thru the carb etc but his saw started...
The service shop keeps telling me its okay to switch my old saw to the 50:1 mix -but i'm like hey the saw has run this long with the old diet and it has not given me any complains.. just me having to measureout the oil dosage for the right proportions...no premeasured bottles for me...darn... he he ....

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