Hi there from over the pond!! I am baffled, I have rebuilt a Briggs and Stratton 450 series mower. I got it started, it ran smoothly for a couple of minutes so I shut it down. When I tried starting it again. No luck. Now it is dead with it backfiring through carb. Cleaned out carb, checked the valve position and movements (lapped and reseated to be sure) checked spark, magneto and air gap all good. Checked key on flywheel, that’s fine but still nothing 😢 Any ideas or areas to check? Thanks Simon
ABSOLUTE PIECE OF FREAKIN' JUNK WITH A COMPLETELY WORTHLESS WARRANTY! - Mine is less than a year old, started smoking during operation, oil turned pitch black, and I thought, "Great, burned valve or wasted valve guide, okay, 'Three Year Warranty' though, right...?" WRONG! Even though the machine has less than four hours of run time, the dealership said that the valves were out of adjustment, and that would NOT be covered... I said, "Hang on... You're telling me this thing's engine is such a colossal piece of shit that they expect the valves to be out of adjustment after being run FOUR HOURS?" First piece of Cub Cadet Equipment... LAST piece of Cub Cadet equipment. Happily going back to Husqvarna... AVOID CUB CADET LIKE THE PLAGUE, THEY DO NOT STAND BEHIND THEIR EQUIPMENT!
I had already learned about what your explaining and misfiring and delt with those problems and fixed them one on a vehicle the others on mower engines an their valve's and closing air gaps
Dude!!! Your the man! How and the heck did you figure out what wires out of the 6 to cross together. Nice hack my brother, I just bought the same generator today and same problem, but your fix is working. It is really sad as my generator is completly out doors. The sensor should not be malfunctioning after 45 minutes of run time. Again thank you.
Appreciated the video. I ordered the same carb for my circa 2003 L120 and it fit with no issues. My machine was losing power when I engaged the mower deck and blowing lots of black smoke. Got it installed tonight and it appears to have resolved the issue. I'll rebuild the factory carb when I have time. A few tips for others that read the comments before tackling a job like this. If you have a L120 with separate choke and throttle levers there will be 2 cables you have to remove before taking the carb off. Once you have the carb off and are disassembling the parts off the carb the video skips over how the original poster loosened the threaded rods. Mine had a hex pattern on them but they were easily loosened with a small pair of vice grips. Just saw the "chickcanic" rebuilding one of these she used a 4mm on the hex end. The video shows this during the re-assembly portion. Good luck!
I have a different Predator but the wiring you showed worked. The wiring colors matched but the videos of my model had different color wires. They changed it up a lot.
Very good information here thank you. I think you may have one thing a little mixed up though. If the key on the flywheel is even a little bit sheared, it does not have any effect on the valve train timing, but on the Ignition timing. That key keeps the flywheel, along with the associated magnets, on the outer edge of the flywheel rigid as to the crankshaft. If those magnets get a little ahead, or a little behind, then they will go past the coil at the wrong time causing the ignition timing to be off. This normally happens when there is a shock to the drive system such as a lawnmower blade hitting a log or a rock or something, the key shearing in order to protect the crankshaft from getting bent, or twisted. The valve timing is located by the timing gears on the camshaft and the crankshaft deep inside the small engines. Although very rare, I have seen where the gear pressed onto the crankshaft gets a little rotated and throws off the valve timing. Other than that, I think the rest of the information is sound, thank you.
I fixed my lawn mower using your video! Your lawn mower was the closest to ours; plastic carburetor and very similar. Symptoms? Would not start and priming had no effect. This mower sat for multiple year periods with E10 gasoline drying out multiple times. Just like you said at 5:18, "if there's a hole spray through it." In my case, most of the holes didn't appear blocked, other than one of the carb ports that the plastic emulsion tube seals into (that pressed in white piece you removed). The one with the black o-ring, that hole in the carb itself seemed blocked or at least restricted. Put as much carb can spray pressure against it. That finally allowed the mower to start, but it would stall unless I pumped the choke. Ran it at high revs (about 10 minutes) by clamping (I know don't do that) the grounding stall lever on the handle so I could repeatedly press the red prime bulb. Dumped the old years-old E10 gasoline back into the gas container with lots of fresh new E10 gasoline. Refilled the mower tank to 1/4 full. Started it by pumping the prime bulb, but letting it almost stall this time. There must be a lot of negative vacuum from the engine as it stalls, because I could sense with each successive near-stall that it was clearing up, able to run on its own just fractions of a second longer with each near-stall. The ethanol must have been getting through one of the plugged orifices and doing what solvents do, dissolve the gummed up hydrocarbon olefins inside the carburetor. I kept letting it almost stall a few more times and voila, it ran on its own!!! A can a carb cleaner (mostly unused), your video, and a little patience. Thank you for this great video!! Success! Just need to let my family know that if they want to keep the mower running tip-top, they need to use it regularly. So obvious!
Good video👍👍 I just got a Shakespeare Universal trimmer Head and It came wth 20 Nuts an Bolts 🫨 I have a Left hand threaded Shaft on my Homelite and only one of these Nuts fit. Unreal an frustrating searching on Amazon for a new Head when they dont specify if its Left or Right headed thread in the discription. Anyway great video Thanks I smashed the like button when you said Sanity and Whatever the F*ck this is 😂👍
So someone would steal my friend's 5 gallon gas from his can that he left up at his cabin every weekend.So one weekend he decided to fix him and fill it with water.Maybe this is what happened..haha
I have a Kohler 21 horsepower and it won't stay running unless you keep the choke on and it backfires out the exhaust and it gets hot real quick what could cause that
@@RepairGang if this is a new engine and that is a metal gas tank, someone could have put oil in it to keep it from rusting because if it's stored for long period of time, sometimes the inside of the tanks will rust. I don't know I'm guessing here.
Great video very helpful. Thank yiu. Suggestion. Better still photo of aligned reassembled carb. I was too quick to remember how I took it apart ! Lol thank you again
Actually the engine is not getting too much air when it is not running off choke, it is not getting enough fuel. The choke creates a small vacuum behind and allows the engine to suck more fuel out of the jet. Usually if your engine does not run off choke the jet is partially clogged.
