20 Most Recent Echo Gas Blower 135 MPH390 CFM Blower PB250 - Page 7 Questions & Answers

Your fuel and air adjustment needle valves are out of adjustment. On the carburetor look for two small screws next to each other. You will need to adjust those screws. The one closest to the air cleaner is the air adjustment screw, and the other is fuel. If you mess up the adjustments where it will not start, screw both screws in all the way (do not force them), and back both out one and a half turns. the trimmer will start... make more adjustments form there.

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manufacturer small engine repair shop or online search using make and model

should be two air adjustment screws, at full throttle or as close as you can get to full throttle, open or turn screw counter clockwise take note on how much you turn it, in the event it does not help, try one then the other as on of these will help 96% sure. have a great day

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http://echo-usa.custhelp.com/app/answers/detail/a_id/1453/~/chain-saw-sprocket-removal-procedures Follow these steps.

The 90 degree fitting gets line with filter in tank.

Check this link. Ut will show you how to check and replace the carburetor. https://www.youtube.com/watch?v=qhabT4aGxvk

Try 1/2 choke and part throttle with trigger, after several pumps of the primmer bulb.....You have to allow some air to the engine when creating a rich start condition.........

I do not know of why putting on a carb would make it hard to pull the rope unless something got bound up putting it back together. Pull out the spark plug and try it. That will eliminate too much fuel in the cylinder. Take off the pull rope to make sure it is ok. Try to turn the motor by hand.

Not sure... the 310 is 5cc smaller and fuel lines are different. May be https://www.ebay.com/itm/Carburetor-Carb-For-Echo-CS-440-CS-4400-Chainsaw-Walbro-WT-416-WT-416C/273678244421?hash=item3fb87e9a45:g:44oAAOSwpptcUVoZ:rk:4:pf:0 same issue with fuel lines but if throttle/choke links the same, save the $s. Look carefully close up images. Spared my 20 yr old weedeater from garbage man with $15 china knockoff. Easier to start and uns better than ever before with OEM carb.

https://www.manualslib.com/manual/573929/Echo-Cs-750evl.html

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