Riding Mower Bogs Or Dies Under Load, Easy Diagnosis / Repair When There Is No Power Or Runs Rough

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We normally get symptoms of this including: Rough or uneven running, the engine bogs down when the blades are turn on or when going through thick grass, there is an unburned raw fuel smell when starting or after turning it off, low power / no power, the mower dies when the PTO or deck is engaged or the engine is making a terrible noise.

We check out the fuel system to see if the bogging issue is caused from bad fuel, lack of fuel, a blockage at the fuel pickup tube, fuel line or filter.

We also check out each cylinder on the mower to make sure they are working independently because this is the most common cause of bogging down or low power in a mower

Poulan Pro 700EX Riding Mower 960420005 00 PBGT22H48
Briggs & Stratton 26 HP Intek engine model 445877-0760-B1

This style is the same on many of the Briggs & Stratton Intek V Twin engine and we go through the full diagnostic process and show how to repair with tips and information.

We love how well these Briggs & Stratton engine run!

If one cylinder or the other is not sparking, then track it down and find which coil or kill wire is the issue.

Video equipment:

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#poulanpro #craftsman #briggsandstratton #smallenginerepair #individualizedrepair #smallbusiness #diymaintenance

About Us:
My name is Martin. I have been repairing tools and small engines for almost 20 years. We operate a small engine repair shop in Illinois. We service / repair Briggs & Stratton, Kohler, Kawasaki, John Deere, Cub Cadet, Toro Tecumseh, Loncin, Honda, Craftsman, Husqvarna, MTD, Troy Bilt, Simplicity, John Deere, Exmark, LCT, Generac and many more brands. We work on riding mowers, walk behind mowers, snow blowers, zero turns, generators, pressure washers and much more. We normally repair about 3,000 pieces of equipment every year and look at many more that are beyond an affordable repair. Hopefully our videos will save you some money and give you the information you need to work on your own equipment or figure out the issue at hand.

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Please be careful when repairing any piece of equipment and follow all possible safety measures. This video is for entertainment purposes only.

[MRMONKIBONES]

Good video, I think someone may have been into this engine before, and wasn't sure of what they were doing. Glad you resolved the problem

[Rein_Ciarfella]

Great diagnostic algorithm! I differ in that if the engine has run long enough to get slightly warm I feel both valve covers to see if they are both contributing. That way I don’t need any tools to start. I found the same clean spark plug on one lawn tractor. Turns out the magnetos were rust jacking so I replaced both.

[howechilds]

Watched your video and fixed my tractor. In my situation I had spark on both sides so I did the test pulling a plug wire off of each side to see if she would die.... she did. I pulled the valve cover off and there it was, the bolt holding the rocker arm on the INTAKE valve had rattled off ... no air nor gas was getting in... the valve was stuck closed. I put it back together and gapped the rocker to the valve and started her up. WOW.. power! I tested the fix by cutting some wet grass and she ran very strong! All fixed. BUT ONE QUESTION... what if the exhaust valve was stuck closed and the engine was still getting fuel and air? How would she run.. or would she not run?

[Rein_Ciarfella]

That engine has a really nice tone to it, once it’s running correctly. 🔧👏👍

[walterbeaver]

Great video. Informative and concise. Thankyou.

[garny]

Issue- valve guides moved. Valve actuates pushing guide back down in head same time bending pushrod or twisting rocker. Pop off springs and measure guide heights and check seal. My remedies is to remove head, drive out guides, cut groves in guides just below top surface of head. Reinstall guides and stake aluminum into grooves of guides. Heads will last life of engine. What causes this is heads getting too hot due to blocked cooling fins or lean conditions from intake leak.

[porkypineacres]

Very informative video. Keep them coming please. 👍

[vicpetrishak]

A friend of mine had one dead cylinder on a 2 cylinder engine . Push tubes bent, determined his small light weight daughter mowed the lawn . She constantly bounced the seat safety switch off and on miss firing the engine causing this failure .

[chadfield]

Very thorough diagnostic and repair; fixing to go pick up a Poulan Pro 46in deck with the 20HP v-twin for $50. Owner says he stopped using mower after it started bogging down while cutting grass, I am suspecting a cylinder issue, looking forward to doing my preliminary checks like you did when I get it home this evening:-)

[steveriggenbach]

That helps to hear the engine noises, thanks. Ł I noticed you didn’t put any thread locker, just torqued. Is that common?

[bobkernahan]

how do you know whether to adjust the nut or the stud on different engines, i see some that say loosen the jam nut and and adjust the stud and other videos say loosen the stud and adjust the nut
thank you for your videos they are very helpful

[sumoneelse]

What about the 19 hp single cylinder?
Bogs when blades engaged.

[eddymumford]

I got that same seat... I took that switch off and I thour it across the room.... what a bad idea....

[JQUICK]

I have almost all new parts on my John Deere D140 and now it seems it has lost some power because it seems to be bogging down when I hit some thick or higher grass and almost seems to want to shut down unless I slow have wondered if the drive belt could have anything to do with this because I did notice it has some big cracks all along the whole belt....but after doing a google search it seems nobody is mentioning the drive belt for problems such as the engine bogging down and wanting to shut off when I hit thicker grassy areas and higher wondering if the transmission/drive belt can be the problem?

[mrfixit]

Where did you buy the Spark Check'r ?!

[Rein_Ciarfella]

I use threadlocker on the valve studs.

[jeremyanthony]

Awesome video. Where are you from? Been watching your channel for a while now. lmk.

[chrisowen]

Wow 26hp that was probably the selling point !!!

[KSMike]

Do I see a crack in the head right behind the exhaust rocker? Could just be a mold seam but it sure looked like a crack on camera.

[dalestanley]

Tell me you adjusted the valves on the other head, changed that plug to match and changed the oil. If not, that's not acceptable.