Post by yvescastonguay on May 27, 2015 7:43:03 GMT -5
Hello group.
I got hold of this DURAMARK 14 inches chainsaw wich is a canadian model sold by EATON Co. Model number is UT-50170 Serial number D8100139. It is a copy of a Homelite XL2. Saw is almost brand new. It would start but after a minute, would rev up and then die. Had to wait few minutes to restart it and would again have the same behavior. I am mechanically experienced since I fix small engines of all kind with success. But this one is a bear. It has kept me stranded and bewildered.
Here's what I've done so far:
-entirely rebuild carb-Walbro HDC-48A;
-entirely replaced all fuel and oil lines, with new duckbills, making sure oil duckbill gap was 1/16-1/8 inch from tubing on porous end;
-checked air thighteness of crankshaft oil seals. Everything holds thight;
-changed fuel, oil, air filters;
-checked oil pump and replaced with a good known unit;
-replaced intake manifold gasket;
-adjusted carb to original specs (1 turn out for both needles);
-cylinder, piston and piston rings are all perfect, near mint condition;
-spark plug is brand new DJ7Y gapped at 0,025 inches;
-ignition module gapped at 0.015 inches.
And STILL same behavior.
What am I missing here?
What would cause this revvup condition? Air leak? But from where? And then why would it die?
I got hold of this DURAMARK 14 inches chainsaw wich is a canadian model sold by EATON Co. Model number is UT-50170 Serial number D8100139. It is a copy of a Homelite XL2. Saw is almost brand new. It would start but after a minute, would rev up and then die. Had to wait few minutes to restart it and would again have the same behavior. I am mechanically experienced since I fix small engines of all kind with success. But this one is a bear. It has kept me stranded and bewildered.
Here's what I've done so far:
-entirely rebuild carb-Walbro HDC-48A;
-entirely replaced all fuel and oil lines, with new duckbills, making sure oil duckbill gap was 1/16-1/8 inch from tubing on porous end;
-checked air thighteness of crankshaft oil seals. Everything holds thight;
-changed fuel, oil, air filters;
-checked oil pump and replaced with a good known unit;
-replaced intake manifold gasket;
-adjusted carb to original specs (1 turn out for both needles);
-cylinder, piston and piston rings are all perfect, near mint condition;
-spark plug is brand new DJ7Y gapped at 0,025 inches;
-ignition module gapped at 0.015 inches.
And STILL same behavior.
What am I missing here?
What would cause this revvup condition? Air leak? But from where? And then why would it die?
