Help with a stihl chainsaw

[Birch Hill Farm]

I have a Stihl MS210 chainsaw that is probably around 5 years old and is causing me problems. It will not stay running, If I follow the starting procedure and choke it with locked trigger, crank it a couple times and then switch it to half choke and crank it, it fires tight up and with in a second it dies. It will do this over and over always starting as long as its choked first then it dies with in a second. So far I have replaced the spark plug, air filter, fuel filter and gave it a tank of fresh gas as well as removing carburetor and cleaning what parts I could reach by removing the side covers of the carb. and it has made no difference. I thought I had solved it when I removed the little vent device at the end of the vent hose, which I assume is what regulates fuel flow by restricting vacuum on the gas tank, it will run and idle with this removed but, it boggs when you give it some throttle. So, I replaced the vent device with a new one and it still wont run. I am out of ideas short of throwing a $50 plus new carb on it, Any suggestions would be greatly appreciated!
thanks-jon

 

[JPRambo]

When you replaced the spark plug, did you replace it with a stihl plug. I have heard, many times that it must be one for it to work correctly.

 

[s219]

Did you actually rebuild the carb? That's probably the next thing to do, and then tune it afterwards. Most carb kits are $5-10.

Is it possible the saw sat with gas in it for a while?

 

[s219]

When you replaced the spark plug, did you replace it with a stihl plug. I have heard, many times that it must be one for it to work correctly.

That shouldn't matter -- my Stihls all came with a Bosch plug, and they have NGK and Champion equivalents.

 

[Birch Hill Farm]

Thanks for the replys! The new plug was a Bosch. I did not rebuild it just took apart the parts that had screws and blew out with carb cleaner. My old air filter had a broken tab on one side and had let a bit of saw dust past so, I though maybe the carb had gotten clogged. So, is a rebuild kit the next best step in this repair?

 

[randy41]

i would start with the fuel line and the fuel filter. i've replaced a bad fuel line a couple of times.

 

[lstinthot]

If the gas tank sat for some time with gas in it, I would take the carb apart and soak it in a carb cleaner solution you can get at an auto parts place. Not just spray with carb cleaner. The dip is about a gallon size container that I have used on many of carbs and have a lot better success than just spray. After it soaks for 20 mins or so then blow out and rinse with water and blow again. Put back in saw and see what happens.

How did the saw run the last time used?

Do you always use an air filter? Any chance of dust getting in saw and messing up cylinder?

Mike

 

[B8FISH]

Agree on replacing fuel line, check to see if it is squishy.

 

[tkappeler]

When you replaced the spark plug, did you replace it with a stihl plug. I have heard, many times that it must be one for it to work correctly.

Mine came with a Bosch and it now has a Champion equivalent. It works just fine.

 

[Birch Hill Farm]

The fuel filter is new, I will check on the fuel line condition. It is possible some dust got in around the filter due to a broken tab on one side of the filter. I also removed the fuel line from carb to see if fuel would flow out, nothing came out but, when I removed the little vent thing from the end of the fuel tank vent, gas came rushing out of the fuel line. This is another reason I replaced the part on the end of the fuel line but, it did not fix the problem.

 

[xyz123]

I would be looking at carb diaphragm, impulse line and fuel line.

 

[Birch Hill Farm]

It doesnt have an impulse line, just the vent line and fuel line.

 

[xyz123]

It doesnt have an impulse line, just the vent line and fuel line.

You sure about that? I have seen part #19 1123 141 8600 Impulse hose on 021 023 025 and on IPL. I can show you on MS210 IPL part #27 1123 141 8600 Impulse hose too.

Here is a pic for you too. :wink:

 

[Birch Hill Farm]

The only hose going to the carb is the fuel line and there is a vent hose coming off the top of the gas tank but, that is all I can find under careful inspection. The fuel line is covered in hairline dry rot cracks so I will try replacing that on monday.

 

[RandyT]

I have replaced about 20 lines on various stihls over the years. Most had dry rot cracks that didn't show fuel leakage, but would suck air under a vacuum.

 

[xyz123]

The only hose going to the carb is the fuel line and there is a vent hose coming off the top of the gas tank but, that is all I can find under careful inspection. The fuel line is covered in hairline dry rot cracks so I will try replacing that on monday.

LOL the impulse line does NOT hook up to the carb on this model thats why you dont see it. The impulse line runs from the cylinder to the back of area where carb bolts to. Impulse line is attached back there. I bet it is just your fuel line with the cracks you mention. But you should check that Impulse line too.

Try looking at a IPL or service manual next time.

 

[Birch Hill Farm]

Thanks for the info, I had no idea about the impulse line.

 

[Lcomin1]

Small screen spark arrested in muffler if they plug give similar results

 

[6thgpSF]

mine was doing that,replaced fuel line.good to go...russ

 

[turnkey4099]

Odd, I have the same saw and jsut about the same age with the same problem. I discovered that warming it up before starting makes teh problem go away. Why? Dunno. Since almost all my cutting it done elsewhere I just throw it in the cab of the PU and run the heater on it on the way to the site. I haven't tried running it at home on a warm day.

Harry K