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  1. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    I'll start digging deeper into the engine and check, I'm ptetty busy so it might be sporadic updates from here on.
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    Husqvarna lc121p with B&S 725EXi engine low power.

    That was one of the first things I did when the old filter was dirty. The bog down starts when the rear plate of the A.F. housing is even placed over the carburetor, it is 100% aligned correctly as it would be if it were fastened into place correctly, and even doing that causes bog down. What...
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    Husqvarna lc121p with B&S 725EXi engine low power.

    I meant the rocker arms oops, my mistake. And yes I checked the valve clearances at TDC of power stroke and both valves were within sepc. As for what slowmo asked, the key is OEM and I got the key in accordance with the illustrated parts list, the airfilter is a brand new OEM filter in...
  4. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    I've emailed both Husqvarna and B&S about this to bring it to their attention, given that without the air filter housing backplate the mower runs fine until it's back on, that's gotta be the issue given that everything else is good and been checked out, or is just a part of the design of the...
  5. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    So I'm not the only one who's having that same thing happen on a thermostatic choke mower? Is this a known thing with some mowers?
  6. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    The air filter is OEM and the correct filter for the model according to the parts diagram. I'm starting to think the verdict is that the low power at start up is an inherent part of the mower until the muffler heats up enough to fully open the choke.
  7. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    This model of mower doesn't have an air vane on it, so it is only relying on the thermostat to heat up to open the choke.
  8. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    I've seen a few videos explaining how the pneumatic autochoke works, however, this model of mower only has a thermostatically operated autochoke, so it sadly does take a bit longer for the choke to fully open from a cold start as it takes time for the muffler to heat up.
  9. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    The one on the right was the original A.F. plate, which the mower didn't use a primer, but an autochoke system. The one on the left was from a similar mower that also had an autochoke on it too, so I just swapped the original plate for the extra one off the similar mower. Could that explain the...
  10. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    The only linkages are for the govner and throttle, and the thermostatic autochoke, both of which I cleaned and lubricated around to be double sure. That might end up as the last resort. I have tried using another A.F. back plate that has more of an opening on it. This one fits on the...
  11. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    Right, I've heard of that being an issue and I was hoping it wouldn't require something like that.
  12. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    I watched the video yes, I did everything he mentioned. The C.C. breather tube isn't crushed and fits snugly on the back of the A.F. plate where it slides on. I've torqued it down and even gave it some extra with my impact drill.
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    Husqvarna lc121p with B&S 725EXi engine low power.

    Further update: I took a deeper look and found that the flywheel key wasn't installed correctly, it was on the incorrect edge and was damaged, so I replaced it. That sorta fixed the problem with the rewind starter jerking back in your hand during starting, it will still occasionally do that. I...
  14. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    Update: Drilling holes in the air filter plate and reinstalling it didn't fix the low power, I drilled out a big hole to open up the fuel bowl vent passageway and the mower is still bogging down. Yet running it without that plate the mower works totally fine. Furthermore, that same plate didn't...
  15. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    I don't think so, when I had the A.F. off, I was watching the govner move the throttle and shaft like normal, I even cleaned the dirt and gunk off of where the govner arm comes out of the C.C. just to be sure it was clear of obstructions and lubricated it. The throttle linkage arm didn't appear...
  16. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    I didn't do anything with the oil, I checked it's level and it was topped off and in good condition. I do understand and follow your reasoning for why it would run rich with the breather tube attached to the plate. I did some more quick investigating before work and I think that your suggestion...
  17. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    Model number: 104M02-0002-F1
  18. W

    Husqvarna lc121p with B&S 725EXi engine low power.

    Helping someone with their mower. Wouldn't run after a winter due to restricted main jet in carburetor. Cleaned that out, replaced the old dirty air filter and fouled spark plug, oil was where it needed to be and was in good condition. Now upon running it, it's super low on power. I've cleaned...
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