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Difficulty starting mower. When I prime with plunger, I don't hear/feel gas sloshing like usual. Housing to air filter was on crooked so replaced air filter. I took apart from fuel line to carburetor and cleaned everything well. Ckd spark plug...it was fine. I got it to start once but running too fast. Adjusted linkage rod, then way too slow (trouble keeping it between 0 and 100). Priming still feels wrong. Finally got it started. Each time it takes a lot of cranking to turn it over (electric start). In fact, I had to recharge and it was just charged up.

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  • Sheila Johnson May 21, 2011

    What do you mean by worse (first sentence)?

  • Sheila Johnson May 21, 2011

    What did you mean by "or worse"? Still with the carburetor or something else?

  • Sheila Johnson May 21, 2011

    I have rebuilt the carburetor with an overhaul kit and toluene. I have struggled with the idle timing. I have trouble keeping the mechanism in place. It vibrates to either 0 or 100. It did start fairly easily today after I recharged the battery. Running fast though.

  • Sheila Johnson May 21, 2011

    Could the plunger be bad? I haven't noticed anything on a quick glance. Even now that it occasionally starts, I don't hear anything when I prime. I really miss those old mowers with a choke and idle/speed adjustment on the handle bar :)

  • Sheila Johnson May 22, 2011

    I have seen cracks in the fuel line but no gas leaking so I assumed it was still okay. "I'll replace it next time" syndrome. Sounds like the air could be getting in there. I'll replace the above. I found my carb overhaul kit that I ordered last fall so I hope to get it in good shape. Thanks so much for your help! I'll fill you back in after I get the parts.

  • Sheila Johnson May 22, 2011

    Very helpful. I have been chasing around this issue for 2 seasons now...needing to tweak and clean carburetor every few mows. I knew there had to be something else. Thanks!

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Replace the primer bulb and check lines for cracks. They fail over time causing the fuel to not be delivered to the carb. Also check gas lines to make sure there is no crack, check the bulb and check carb gasket.If their are any signs of cracking in any of them, replace them... whats happening is somewhere air is getting in and displacing the gas, not allowing for a good suction. Check the plunger if its cracked or bent it can be the issue.Also check the fuel line and vents.If its clogged or cracked it can cause such problems, ------- This should help.Thanks.Helpmech.

Posted on May 21, 2011

  • raj somaiya May 22, 2011

    Yes that should help.Keep updated with the results.Thanks.Helpmech.


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It sounds like you may have a clogged jet in your carburetor, or worse. I would start by removing the carburetor and replacing it with a new/rebuilt one, or taking it to a mower shop for rebuilding.

Usually, a replacement carburetor for a mower will cost anywhere from around $50.00 to $100.00. Having a shop rebuild yours is much less, and buying a rebuild kit for you carburetor costs even less. Rebuilding your carburetor involves using solvents for cleaning, removing and replacing tiny parts such as springs, clips, etc., and readjusting idle screws, valves, etc. I would recommend having a professional shop rebuild your carburetor, or replace your existing carburetor with a newer, redesigned carburetor.

Posted on May 21, 2011

  • Jeremy Moore
    Jeremy Moore May 21, 2011

    Your valves could be out of adjustment, but I am betting it's the carburetor. Hard starting, and difficulty priming deal primarily with the carburetor.

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Husqvrna hu775h wont start


Suggest start w/ the basics : Air, Fuel, & Spark. Internet search indicates that it's a Briggs & Stratton engine, which I just worked on yesterday (165 cc version). Easiest things first - ensure that there is FRESH fuel in the tank. If it's been sitting there all year, drain it out and refill with new fuel. (make sure you follow mfgr's recommended fuel type.) If you have a primer pump, make sure you can hear fuel flowing when you depress it (typically 3 - 6 pushes to prime the engine). If not, then youi may have a fuel line or fuel filter clogged. If you remove cowling/covering over top of engin, you can get access to the air cleaner. Remove the air cleaner/filter, and you can see into the carbuerator. This should make it easy to see if the primer pump is squirting fuel when depressed. While the air filter is out, make sure it is clean. If gunked up, I usually soak it and wring it out in fresh fuel, then let it air dry to clean it out (mine is made of foam). If it's a cartridge type air filter, blow it out w/ compressed air, or put a new one in if it's dirty. Lastly, if you have an assistant, you can check to see if you're getting a spark. Remove the spark plug, inspect if for correct gap and overall condition - remedy if you see something wrong. Then with it out, connect the spark plug cable (the high voltage line) to the top of the plug. Now, while touching the threaded part of the spark plug to a bare metal part of the engine case or lawnmower chassis, have your helper pull the starter cord and look at the plug's gap for a series of sparks.

If you don't see any sparks jumping the spark plug gap, you may have a bad plug, bad cable, too big a gap, or a bad magneto, or corroded connection to the top of the plug.

If you don't have fuel flow, you may have a clogged fuel line or fuel filter.

Air flow is pretty basic, so with the air cleaner removed, it should be pretty obvious if you have an airflow restriction. You can leave off the air cleaner/filter to troubleshoot the engine and to start it, just don't operate the mower without it, or you risk sucking in junk, rocks, you name it, into your engine.

THis may go without saying, but also inspect all linkages, springs, cables, etc. IF you see something loose or broken, check the owners manual or diagrams and remedy that. Also check out the Troubleshooting section in the owner's maual (available on-line at Husqvarna)

My problem yesterday was very simply BAD, OLD GAS. Briggs & Stratton make a pretty reliable, easy to start lawnmower engine. But even that's not enough if you're feeding it bad or contaminated gas.

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1 Answer

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James

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by saying filter(s), i assume this is a diesel engine

The filters must be filled with fuel prior to installing them, that will induce air into the system and will not allow for fuel to flow

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