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My 13.5 ho b&s surges heavily but smoothed out when blade/ deck is engaged or when I apply choke. I've twice cleaned carbs and still now working. I ran in garage with no air filter to elimina

13.5 hp Briggs & Stratton

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  • 316 Answers

Hello sir, mower will not start or run,runs only when primming, does it have good spark,good compression,or only runs on full choke, are you getting fuel to the engine if not try this,your fuel pump or your carb. is clogged up here is what you can do for a simple repair for the carb,you can remove the air filter and assy, empty fuel tank and clean out tank and line,remove the bowl nut and bowl careful of the gaskets,now spray carb cleaner in the small port holes in the carb steam in the middle of the carb until clean,now spray the bowl nut holes until clean there are three,after cleaning put bowl on the same way you removed it with dip towards front of float,put bow, and fresh gas,you should be good to go,hope this helps.,thank you.~~

Posted on Feb 19, 2012

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Posted on Jan 02, 2017

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SOURCE: engine on riding lawn mower surging

Dirty air cleaner.

Clogged fuel filter.

Replace or clean both...

Posted on May 29, 2009

  • 218 Answers

SOURCE: My 18 hp twin cylinder Briggs and Strat. Craftsman

Hi..my name is Keith...and the engine is running too lean..and with you choking it..it richens the mixture..so its a carb problem..and that could be several things..1)..is the main metering jet needle on the bottom of the float bowl needs to be turn out until the engine runs smooth..or 2) the carb to engine gasket is bad and its sucking air..or 3)..the passage ways in the carb is stopped up..i hope one of these will help..if not please write me back

Posted on Jul 10, 2009

  • 257 Answers

SOURCE: Briggs and Stratton Carburetor

you did not say what kind of mower it was ,, hope this help you,, if it has a metal rod that hooks to carb in a long round like shape, take carb. lose hook to carb first and then put the rounded in the slot going to your gas feed,, move your gas up and down and look to see where it is moveing and you will see a slot there,may sure you put end in carb on top

Posted on Aug 30, 2009

mowerman1857
  • 389 Answers

SOURCE: timing for briggs and stratton 15.5 engine

There are no timing marks, timing is correct when the flywheel key is in place, the flywheel is properly torqued and the air gap for the magneto is properly set

Posted on Sep 29, 2009

miket756
  • 2702 Answers

SOURCE: My Briggs & Stratton Diamond I/C 13.5 HP has

it could be worn out piston rings letting unburnt fule past into the sump oil

Posted on Jun 20, 2010

Testimonial: "Thank you for theinformation. I did suspect it may be the Piston Rings but I always thought you would get heavy smoke from the exhaust if the rings were going??"

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John deere 855-70 manual


On ALL Deere riding lawn mowers, 1st, position the deck under the tractor. Depending on the belt drive: either PTO (the yellow button on the dash panel), or tension engaged-(a lever on the right side of the operator\'s seat), you loop the drive belt from the front of the deck to the pulley, always in the lower front area of the tractor\'s engine. If it has "beltguards" too close to the pulley, you must loosen the retaining bolt for the guard, it will allow the belt to squeeze by and onto the pulley. Then, 2nd but don\'t forget to retighten after slipping the belt on, push the "Deck heighth" lever fwd to drop the deck "hangars" at the rear of the deck into position to "pin" the eyelets with the supplied pins, washers and keepers: usually a cotter pin or a lynchpin that inserts thru a hole on the smooth bolt-pin. The easy part\'s over, but don\'t panic. 3rd, lift the front of the deck onto a block, allowing a heighth to apply the "adjusting rod" into the front of the mower chassis. Screw the retaining nut onto the threaded (long bolt) and remove the block. You\'re done. Next, and very important, RAISE & LOWER the deck, engage the belt tension, (here you may have to clear the area and start the engine to engage the PTO drive, if it\'s electronically controlled belt-drive), this assures nothing is "misaligned" or improperly positioned. Now, if the machine is on a flat surface, lower the deck to a point just above the ground and measure the distance in four (4) corners of the deck and record the ht. Make the adjustments to LEVEL the deck. Now you\'re ready to start the engine from the operator\'s seat, slightly increase the engine from idle to 1/4 throttle speed so that engaging the drive belt won\'t kill the engine. Ensure the belts run smoothly, the blades turn, and the engine doesn\'t "bog". Lower the deck to a desired cutting ht., now MOW the grass!

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1 Answer

2005 rm 65 carb choke is reversed


It is not possible for the choke operation to be reversed by its design. You have created some other condition in the carb with incomplete cleaning or improper reassembly. Dissassemble carb and carefully inspect every piece for proper placement(right side up or down) and cleanlyness. Inspect the float and float level carefully.

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1 Answer

I have a Briggs & Stratton 2 cylinder motor Model # 42A707-125201. Runs fine at high speed with the choke off, but it will not idle smoothly unless the choke is partially on (about 2/3). I rebuilt...


The fact the choke must be 2/3 applied to obtain a smooth idle indicates not enough fuel is being supplied by the carb at idle speed. Applying the choke richens the air/fuel ratio.

I suggest you revisit the carb idle air/fuel jets, air passages and any adjustments as well as checking for intake air leaks.

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1 Answer

Husky yth1542xp. I've changed the blades, leveled


When levelling the deck, rotate the blades so that the right blade has one of its cutting edges at or near the right side center of the deck. Do the opposite with the left. Measure to the blades from the level ground, not to the deck. Try leveling that way.
Gary

Jul 03, 2011 | Husqvarna Garden

1 Answer

After about 30 minutes engine will start surging, by partly pulling the choke out it will run better. The carb has been recently rebuilt as well as new filter and fuel line to carb. Tried different fuel...


Typically a surge is caused by a lean condition. I'd say the float is set to low and this is causing the engine to lean out & when you apply the choke it richens it back up.and the surge stops.

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3 Answers

Motor chokes and misses under moderate load and loses power


Sounds to me as tho it might need a carburetor adjustment, providing there is an adjustment screw on the carb. Sounds like the engine is running a bit lean. Did this problem occur right after the carb cleaning, or was it there in advance? Is there a fuel filter that might be clogged?

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1 Answer

Won't start, has "varnish" from fuel


Does it have a fuel pump or is it gravity fed? If gravity fed, when you rebuilt the carb, did you make sure that the main (power) jet orifice was totally clean? No varnish or residue in the hole. Pressurized air or carb cleaner spray into the jet is a good way to test flow restrictions. It sounds like a clogged main jet or a vacuum leak at the carb to manifold gasket. You might want to flush the gas tank and replace the gas cap also, as evaporating fuel over time will leave behind varnish deposits if the cap doesn't seal, even though it is a vented cap.

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1 Answer

Lawnmower loses power when I engage blades


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