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Question posted by druin177 on April 24th, 2022

Replaced The Auto Choke Spring. The Pulley That Is On Top Of The Carburator Fluc

The pulley that is on top of the carburator fluctuates back and forth and the mower does. Replaced the auto choke spring

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Answer #1: Posted by SonuKumar on April 24th, 2022 8:26 PM

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SonuKumar

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Why does my lawn mower throttle up and down?

Image result for Husqvarna HU725AWD BBC carburetor fluctuates back and forth and the mower does

The lawnmower may rev up and down if the spark plug is damaged or having an unbalanced adjustment. You want to make sure the cables connected to the spark plug don't become loose and move unsteadily in a particular direction. Apart from that, check inside the spark plug if there are any corrosion build-up issues.

https://www.manualslib.com/manual/1068205/Husqvarna-Hu725awd-Bbc.html?page=18#manual

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Related Husqvarna HU725AWD BBC Manual Pages

Owners Manual - Page 2

...CAUTION: Mufﬂer and other safety protective devices in wet grass. WARNING: This lawn mower is equipped with an internal combustion engine and should not be picked up and thrown... or other objects that children be a minimum of 12 year of age before operating a pedestrian controlled lawn mower and a minimum of 16 years of age before starting the engine (motor). • If the equipment...

Owners Manual - Page 3

...176;F); lbs. Always let someone know you to assemble and maintain your purchase of a new lawn mower. IV. Please read and retain this machine, including (at all cigarettes, cigars, pipes and... THE LAWN MOWER HOUSING. GENERAL SERVICE • Never run a machine inside a vehicle, on clothing, change the engine governor setting or overspeed the engine. • Maintain or replace safety and...

Owners Manual - Page 4

... WITHOUT OIL OR GASOLINE IN THE ENGINE. Insert handle bolts through lower handles and handle brackets; Your new lawn mower has been assembled at . 3. OPERATOR PRESENCE CONTROL BAR LIFT UP HOW TO SET UP YOUR LAWN MOWER TO UNFOLD HANDLE (See Figs. 1 and 2) IMPORTANT: UNFOLD HANDLE CAREFULLY SO AS NOT TO PINCH OR DAMAGE...

Owners Manual - Page 5

...ROPE GUIDE T-KNOB ENGINE STARTER ROPE FIG. 4 TO INSTALL ATTACHMENTS Your lawn mower was shipped ready to bagging or discharging, see "TO CONVERT MOWER" in STOP position. 3. INSTALL STARTER ROPE (See Fig. 4) 1....manual. 5 Make sure the frame handle is outside of bag on the bottom. To convert mower to be used as a mulcher. Slip vinyl bindings over frame. NOTE: If vinyl bindings...

Owners Manual - Page 6

... CATCHER WHEEL HEIGHT ADJUSTER (ON EACH WHEEL) DRIVE CONTROL LEVERS HANDLE KNOBS ENGINE OIL CAP WITH DIPSTICK AIR FILTER MUFFLER GASOLINE FILLER CAP IMPORTANT: This lawn mower is shipped WITHOUT OIL OR GASOLINE in literature supplied with the location of various controls and adjustments. Consumer Product Safety Commission. OPERATOR PRESENCE CONTROL BAR...

Owners Manual - Page 7

...any circumstances attempt to minimize the risk of any adjustments or repairs. HOW TO USE YOUR LAWN MOWER THROTTLE/ENGINE CONTROL (See Fig. 5) The engine is engaged and comes up in severe... eye damage. Always wear safety glasses or eye shields while operating your lawn mower or performing any lawn mower can result in foreign objects thrown into the eyes, which can result in high ...

Owners Manual - Page 8

... requirements. Medium position is best for most lawns. • To change cutting height, pull up or down to the handle. Operate mower to increase tension on adjuster lever, move ...become "loose", resulting in the same setting. NOTE: Adjuster is worn and should be replaced. 8 LEVER FORWARD TO RAISE MOWER FIG. 9 If condition fails to increase drive speed. 3. quired. 4. Turn unit...

Owners Manual - Page 9

... removed or propped open. Rear door closed and locked. Mulcher door closed . 2. Discharge deﬂector installed. OPERATION TO CONVERT MOWER Your lawn mower was shipped ready to be used as shown. • Mower is now ready for discharging operation. • To convert to mulching or bagging operation, discharge deﬂector must be...

Owners Manual - Page 10

... gas can attract moisture which leads to residual oil in the fuel tank or permanent damage may need to change the oil more often under lawn mower handle. 3. Lift up on dipstick. • Change the oil after every 25 hours of 87 octane. it run until the fuel lines and carburetor are...

Owners Manual - Page 11

..., mow across (perpendicular) to form clumps and interferes with an automatic choke system. Mow north to south one -third of grass clippings and chaff. This will collect less grass...catcher off only the top one week then east to direct sunlight. • For best results, adjust the lawn mower cutting height so that as very tall grass, it is the early afternoon. NOTE: Your engine is not ...

Owners Manual - Page 12

... EVERY 25 HOURS 100 OR SEASON HOURS BEFORE STORAGE Check for Loose Fasteners Clean / Inspect Grass Catcher * Check Tires Check Drive Wheels *** Clean Lawn Mower **** Clean under Drive Cover *** Check Drive Belt / Pulleys *** Check / Sharpen / Replace Blade Lubrication Clean and Recharge Battery ** Check Engine Oil level Change Engine Oil Clean Air Filter Inspect Muffler...

Owners Manual - Page 13

... cloth. 4. Remove hubcaps, locknuts and washers. 2. BLADE CARE (See Fig. 16) For best results, mower blade must be sure to clean all wheels. 1. CAUTION: Use only a replacement blade approved by the manufacturer of your warranty. Turn lawn mower on the mower. • To check blade balance, drive a nail into Blade Brake/Clutch. 4. Remove blade bolts...

Owners Manual - Page 14

... are not to be used to clean cartridge. Rock lawn mower back and forth to check the oil level with the slots in the back plate. Replace the air ﬁlter cartridge every 100 hours of ...64257;rst. Stop adding oil when you check the oil level. SPARK PLUG Replace spark plug at least once a year if the lawn mower is empty. 1. Change the oil after each mowing season or after every 100...

Owners Manual - Page 15

...tting while engine is clean. CLEAN UNDER DRIVE COVER Clean under drive cover at the ﬁtting. Move lawn mower to an area of gasoline, oil, etc. • We do not recommend using a garden hose to...in engine can result in contact with plug. • Clean the underside of your lawn mower by scraping to remove build-up of trash or grass on water supply and check for a full...

Owners Manual - Page 16

... The rear deﬂector, attached between the rear wheels of your lawn mower has three (3) height positions - DRIVE BELT If your mower does not operate properly due to suspected drive belt problems, take your mower to height that objects will be replaced. adjust to a Husqvarna or other qualiﬁed service center for repair...

Owners Manual - Page 17

... all dirt, grease, leaves, etc. ENGINE OIL Drain oil (with engine warm) and replace with new spark plug. Pour one season to another. • Replace your gasoline can if your can fold your lawn mower handle for damage, breakage and wear. Replace if necessary. 4. ALCOHOL BLENDED FUELS (CALLED GASOHOL OR USING ETHANOL OR METHANOL) CAN...

Owners Manual - Page 18

... any enclosure. Water in OFF position. 10. Tighten blade bolt or replace blade adapter. 8. Depress control bar to give protection from dust and dirt. • Cover ... condensation to form and will cause your unit to the ON position. 11. CAUTION: Never store the lawn mower with a suitable protective cover that does not retain moisture. Dirty air ﬁlter. 1. Bad spark ...

Owners Manual - Page 19

... area. Contact a Husqvarna or other hard surface before pulling starter rope. 2. Replace blade adapter. 4. Move lawn mower to cut - Cutting height too low. Lift on pulleys / replace belts if broken. 4. Catcher not venting air. 1. Replace blade. 3. Clean grass catcher. Blade/brake clutch does not engage 1. Replace blade/brake control. Engine dies when starting . Cold engine...

Parts List - Page 3

... HU725AWD/BBC (96143010400) PRODUCT NO. 961 45 01-04 KEY PART NO. IMPORTANT: Use only Original Equipment Manufacturer (O.E.M.) replacement parts. Failure to do so could be hazardous, damage your lawn mower...ector Handle Bracket, LH Handle Bracket, RH Screw, Dogpoint 3/8-16 x 1-1/8 Spring, Hinge Nut, Hex Kit, Lawn Mower Housing Rod, Hinge Blade Brake/Clutch Assembly Blade, 22" Washer, Hardened ...

Parts List - Page 5

... Idler Pulley Spring, Tension Support Bracket Screw Adapter, Quick-Connect Coupling 5 NOTE: All component dimensions given in U.S. inches. 1 inch = 25.4 mm. IMPORTANT: Use only Original Equipment Manufacturer (O.E.M.) replacement parts.... NUMBER HU725AWD/BBC (96143010400) PRODUCT NO. 961 45 01-04 KEY PART NO. Failure to do so could be hazardous, damage your lawn mower and void ...