Hi, First post here. I am working on a Husqvarna 254 it has a HDA 35b carburetor. i do have mechanical ability and have cleaned many carbs for other small engines and motorcycles but this one is driving me nuts. I have had the saw for 8 to 10 years. always use 91 octane. i use a couple tanks of gas a year.
The saw had weak spark so i put a new coil in it. spark is very good now. i have cleaned the carb multiple times- and it did not look to be dirty. i used a little metal wire to make sure the ports were open, carb cleaner and compressed air. i installed new gaskets and diaphram. i set the meter lever level with the housing- which is what it was. i set the Low and high jets at 1.25 turns out. it starts and runs but bogs out. i leaned the idle about a 1/4 turn and adjusted the idle down to stop the chain. it idle and revs well... the issue im having is at wide open. it just keeps bogging out. if i hold the throttle wide open- use a short squirt or carb cleaner off to the side of the air cleaner it just dies. its still getting too much gas. i currently have it running the best- without bogging while cutting- with the High jet completely tight!! which does not make sense. the high and low have different threads so they are not interchangeable- i checked... what am i missing? there is something wrong with the high jet circuit. i did try blowing in the inlet needle to make sure it is not leaking and is clean. it does show a check ball and spring 501 468 401 and 501 that i have not looked at- later found the ball and spring are the choke friction ball and spring... number 503 592 750 repair kit for an o-ring and a tiny cup with orifice which i know is clean. is that supposed to be a check valve? i can put a wire through the middle and it goes into the High screw port... any help would be appreciated. looked at a replacement carb for $220. saw is not worth that. im thinking one of the check valves or the main jet are ruined.
The saw had weak spark so i put a new coil in it. spark is very good now. i have cleaned the carb multiple times- and it did not look to be dirty. i used a little metal wire to make sure the ports were open, carb cleaner and compressed air. i installed new gaskets and diaphram. i set the meter lever level with the housing- which is what it was. i set the Low and high jets at 1.25 turns out. it starts and runs but bogs out. i leaned the idle about a 1/4 turn and adjusted the idle down to stop the chain. it idle and revs well... the issue im having is at wide open. it just keeps bogging out. if i hold the throttle wide open- use a short squirt or carb cleaner off to the side of the air cleaner it just dies. its still getting too much gas. i currently have it running the best- without bogging while cutting- with the High jet completely tight!! which does not make sense. the high and low have different threads so they are not interchangeable- i checked... what am i missing? there is something wrong with the high jet circuit. i did try blowing in the inlet needle to make sure it is not leaking and is clean. it does show a check ball and spring 501 468 401 and 501 that i have not looked at- later found the ball and spring are the choke friction ball and spring... number 503 592 750 repair kit for an o-ring and a tiny cup with orifice which i know is clean. is that supposed to be a check valve? i can put a wire through the middle and it goes into the High screw port... any help would be appreciated. looked at a replacement carb for $220. saw is not worth that. im thinking one of the check valves or the main jet are ruined.
