MS390 won't run

[slackbladder]

MS390 has started to play up.Starts ok after about 6 pulls which is usual But then as soon as I try to give it revs it just dies,changed the fuel filter as I thought it was fuel starvation but it made no difference,just the same with or without the chain and bar on

Gradually got worse over the last few weeks

any help gratefully received

[onyx landscaping/fencing]

how old is the fuel in it? I had the same problem week or so ago with my ms211 and it turned out the fuel had gone bad! thing is the fuel was only 5-6weeks old!

[slackbladder]

Fuel is a couple of months old

[onyx landscaping/fencing]

id try it on fresh fuel fella! I couldn't believe how fast my fuel had gone bad!

[Eddy_t]

I'd recommend you try using aspen, mr slack, but you may need to change the carb gaskets and fuel lines

 

 

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[Acg128]

My 390 is doing exactly the same and the fuel is fresh.. I'm going to take it into the local stihl gaff to get it sorted.. I'll let you know what there saying, hoping to get there tomorrow.

[Eddy_t]

Tbh the low screw is probably a bit too lean, try turning it anticlockwise about 1/8 of a turn

 

 

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[spudulike]

It could be a number of things but from personal experience have had issues with the carbs on 029/039/MS390s. A deep ultasonic clean has resolved the issues I had.

[Eddie@aspen]

My 390 is doing exactly the same and the fuel is fresh.. I'm going to take it into the local stihl gaff to get it sorted.. I'll let you know what there saying, hoping to get there tomorrow.

Sounds like the carb is blocked causing lean running. When you have it fixed the use of Aspen would stop this happening again so you can keep using the saw.

 

Kind regards

 

Eddie

[gensetsteve]

MS390 has started to play up.Starts ok after about 6 pulls which is usual But then as soon as I try to give it revs it just dies,changed the fuel filter as I thought it was fuel starvation but it made no difference,just the same with or without the chain and bar on

Gradually got worse over the last few weeks

any help gratefully received

 

Did you get to the bottom of this problem mine has just started doing the same thing.