MS 261 CM - Starting on choke then when choke knocked off saw runs fast as if running out of fuel then stops

[AJB18]

2017 MS 261 CM saw all of a sudden only starting on full choke. When the trigger is pressed to knock choke off the saw revs high as if running out of fuel before cutting out. 

 

The saw will then not start unless put back into full choke. I have checked the fuel filter (seems clear), old fuel has been dumped and new put in. I have checked the fuel line as best as I could seems fine no cracks. Clutch springs all fine, only thing i have seen online is people mentioning the fuel solenoid or the carb? 

 

Has anyone had this problem before or anything similar? Trying to get to the bottom of it before potentially taking it to a local stihl dealer. 

 

Id appreciate any advise or ideas? 

 

Cheers 

 

Ashley 

[NFG]

Check the plug colour, it may be running lean

[AJB18]

Thanks NFG

[spudulike]

Sounds like lack of fuel, most likely cause is a blocked gauze filter in the carb, it may be a sticky or too low metering arm/needle valve as a second suggestion or beyond that, a dodgy solenoid but this usually lets the saw rev but will constantly die on idle.

 

[Vedhoggar]

Might be ethanol which can block passages in small engines if you are not using ethanol free petrol or using an ethanol inhibitor, particularly if not using the saw often, some 2-stroke oils have an inhibitor added to them or it can be added to the petrol.  Someone working with me had this problem with his saw and it cost £50 to sort out the carb.

Edited February 2, 2020 by Vedhoggar

[AJB18]

Cheers fellas I will have a look and get back to you. 

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