Small Engines (Lawn Mowers, etc.)/echo chainsaw

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Question
QUESTION: MY YOUNGER BROTHER HAS A CHAINSAW HAS HAD IT IT FOR ABOUT 6 YEARS. THE SAW IS AN ECHO CS-305. WE RECENTLY REPLACED THE OLD CARB. WITH A NEW ONE. WE REPLACED ALL THE FUEL LINES, PLUS PRIMER BULB, CHECK VALVE AND GAS FILTER. THE PROBLEM WITH THE SAW IT STARTS AND RUNS THEN AS IF YOU WERE GOING TO SAW DOWN A TREE, TURNING SAW ON ITS SIDE IT KILLS OUT. YOU TURN THE SAW UPRIGHT AND IT STARTS AND DIES OUT. YOU LET IT SIT FOR ABOUT 10 MINUTES THEN STARTS AND RUNS GOOD TILL YOU TILT THE SAW SIDEWAYS AND AGAIN IT DIES OUT. THE GAS TANK IS FULL NEW SPARK PLUG, AND ABOUT 90 LBS. OF COMPRESSION. WE CANNOT FIGURE THIS ONE OUT. SO WE ARE TURNING TO YOU MR. JONES FOR EXPERT ADVICE. THANK YOU FOR YOUR TIME, WE APPRECIATE IT.

ANSWER: Was there a weighted fuel filter in the fuel tank connected to the fuel line?  Almost all saws fuel filters are weighted to they always fall down in the take to reach the fuel.

Did you have to adjust the new carburetor?

Eric

---------- FOLLOW-UP ----------

QUESTION: THE FUEL FILTER IS HEAVY , AND YES I DID HAVE TO ADJUST THE NEW CARBURETOR IT WILL IDLE FOR A FEW MINUTES THEN DIES OUT. I WONDER IF ALL THE FUEL LINES ARE CORRECTLY INSTALLED. IS THERE A SCHEMATIC DIAGRAM ON FUEL LINE ROUTING ON THIS ECHO CS-305? OR IS IT SOMETHING ELSE THAT I AM UNAWARE OF.

Answer
Does the saw have a primer?  If so, does it work?

If the primer is working most likely the fuel lines are properly connect.

Did you use a compression gauge to check the compression?

90 PSI is borderline on the low side...any lower and the saw will probably not idle and will not have any power.  It can also run erratically like you described.

Did you check the compression when the engine was hot and with the throttle wide open?

Eric

Small Engines (Lawn Mowers, etc.)

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Eric A. Jones

Expertise

Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.

Experience

Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

Education/Credentials
MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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