Mower Backfires while trying to start it. Easy fix.
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- čas přidán 26. 08. 2024
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I got this mower pretty cheap and when I tried to start it the engine backfired a LOT. Turned out that a rocker has lost it's valve cap and it was actually a great little motor.
This is another easy DIY mower repair. Almost anyone can do this at home.
Update, this mower has found a good home in Oklahoma. :-)
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Besides fixing the mower, you get an excellent job of answering all the good and bad comments. I'm a new ride on point.It's easy to tell Who knows what they're talking about?When you know you know
Thanks, I enjoy working on them. I understand that a lot of the people watching are looking for answers, and others are like me and love little motors. This started as a hobby when I was a kid and never ended(I hope it never ends) 🙂
So... this just fixed my mower!!!! Thanks so much!! Exact same issue, I took the cover off and there was the same piece in the cover.
Cool! I love hearing stuff like this
Dude! You had the mower sitting on your leg and the spark plug wire was still on!😳😳😳 Safety First!!
Of course you are right, but that would take all the fun out of it. LOL.
I shouldn't be using my leg as a holder in the first place, I blame a bad upbringing. (Joking, of course)
@@GuysPlayingWithTools lol yeah guys like us are dumb sometimes for no reason.
@@Mike_Greene We can be sometimes. 😎
I don't think It would have started with what I did but he was right, I would have missed that leg if it did. 😲
Crazy lol
Good video 6:55
That seems to me like a mower someone has pieced together. That's a very old self=propel system, and a very new engine. Good job!
Thanks. When I first looked at it I was a little surprised at the self propelled system myself. You are right, the deck and the motor didn't start life together. I had to have it, just to get it running and see that dangerous looking self propelled system with for myself. It did, it was odd and scary looking but it worked great.
Thanks just fixed my lawnmower doing this.
Congrats! Doesn't it feel great when you hear it running right and you know you did it
came in from a nasty issue with a B&S that is backfiring after wife hit a trailer hitch with the blade. am just cooling off after restling with it to see this video. She backfiring everyso often but not seeing like she has compression. So a sunday set to relax a little and do other things is now a "I have to get the lawn done today" and I have no runnign m owers. Oh and did I mention I found out Inhave effing cancer this week too? yeah. nice huh?
I am sorry to hear that. I will cross my fingers that they can get you through it in one piece. I don't complain about anything because I know a lot of people have it tougher than I do.
Did you check to make sure it didn't toss a valve spring? Hitting a stump can shake the motor up enough to cause it, and it would take compression down to 0... even though it kinda runs.
If you are near Dallas, send me an email and I will set you up with something that works. I usually have something around that I wouldn't miss. 👍
Glad you were able to fix it!
It was worth it just to see the unusual rear drive mechanism in action.
great help, Thank you!!! it was the valve in mine too!
Thanks. 👍
Those self propelled Snapper mulchers were somewhat pricey when new, and I rarely see one in my area. The Briggs & Stratton 6 HP Intek is a tough engine, and the rest of the mower is well built. The only disadvantage is a brace has to be removed underneath to access the oil drain plug. The price was a steal.
They are tougher than people give them credit for. I see a lot of people turning mowers over to drain the oil, I am with you, I tried it both ways, then got in the habit of using drain plug, even when it's hard to get to. This that way I don't have to drain the gas.
Those early Briggs OHV engines were very problematic and hard to get parts for. In addition to the valve train troubles (which the new ones STILL have), the carb had a tendency to leak and fill the crankcase with fuel due to the low intake port design too. They run great when they’re all dialed in but they were nowhere near as reliable as the flatheads. That Snapper snowblower drive system always makes me chuckle, how many parts and goofy linkages can you use to accomplish the simplest task lol!
I am a huge flathead fan. My personal edger... Techumsa flathead motor. 9 years old and running strong.
I have drained more than a couple mowers of oil that was more gas than oil...
Ran over a hidden chunk of tree root, stopped the mower dead. Restarted it and it was ok, but vibrating (probably bend the blade). Shut it off, now when starting it again it will backfire one time on startup, it never did that before. I do not notice any discernible difference in the motor sound from before or after the impact.
Ouch. Sounds like something changed in the motor when it happened. What motor is it?
Thanks, that worked!
I love it when somebody comes back and tells me a vid helped!
I love when people post something that's actually useful 😁
@@shineyrocks390 Thanks. I try to come up with the stuff that drives people nuts and give answers and ideas. That particular video came about when a subscriber said "you should...."
Turns out a motor that sounds terrible isn't always as bad as you might think. A loose rocker makes all the difference
Surprised you didn't set the valves with feeler gauges.
I did, it just got edited out because I was playing old Rush music and I didn't want to pay royalties. 😝
oh it had a rhythm to it?. thanks for letting us hear this rhythym YOU had heard. oh wait a minute . . .
it is part of YOUR diagnoses why not had shared with us?
It was a little terrible, the intake rocker was off, I probably would have thrown a rod off I had kept it running or I would have.
@@GuysPlayingWithTools ah, i see, well, i dont/didnt see, but i understand now
@@Mike_Greene I did think about it though.... I knew it would be cool to show the huge difference but I didn't want to lose the motor.
Bill I know it's just a mower but what's the valve lash? I never guess and adjust it in till its in the sweet spot for the engine even after setting it to Spec. Just me!
I use a soda can, I tighten until there is the slightest drag while pulling it through, then tweak while running. It will be almost perfect. It's like Coke and Pepsi know exactly what they should be set at.
@@GuysPlayingWithTools that actually makes sense lol 😆
It sounds crazy but the metal is just about the right size and the look on people's faces when you cut a can to make a feeler gauge is priceless.
My push mower backfires every other time and and a ping sound when pulling cord. Now it don't srart.
It's only 4 bolts, trashed the valve cover off and see if anything looks odd, watch for loose sticker arms and springs. Let me know what you find and I will try to help
Nice lawn
Thanks! I am retired and have no more excuses to not take care of it. 🤣
What bit/sockets are you using with the driver?
This one was an older mower, so it used SAE sockets. You can break down a Briggs motor top to bottom with a 3/8, 1/2, and 9/16 👍
never seen anyone adjust valves to a little wiggle !
After doing way too many valve adjustments you get a pretty good feel for them. You are right though, I really should have used the gauge (or my favorite, a piece of a soda can) for the video.
I found a Toro in great condition. I sprayed it with starter fluid. It backfired and pulled the rip cord back so hard it slapped me in the other hand. Anybody ever heard of this before? Putting this back to the street. I'm concerned this pull cord might be dangerous backfiring
Iam pretty sure one of 2 things could have happened to it. Check the bottom and see if the blade is torn up, it may have hit a stump and wrecked the flywheel key. If everything looks good underneath I would need to know which motor it has before I jump into the next idea. Does it have a valve cover in the front of the motor?
@@GuysPlayingWithTools hey thank you for the reply! I'll check it out and get back to you! This mower is $539 new. If I could get it running that would be great. My old mower rusted out and I'm concerned about using it and having rocks and shrapnel flying at me
The channel is all about you guys and helping where I can. 👍
Let me know if it's got a valve cover, and whatever it says on the top of the motor, if it's what I think. It's a pretty easy fix
Should oil come out that part
Nooo. 😆 If oil comes out the carb, the first thing to check is whether it was overfilled, that's the problem 90% of the time. The next thing to check is usually the valves, I see valve springs jumped all the time.
NEVER NEVER reach and turn blade....For one thing, a young child may watch that !!!
The engine brake and kill switch would keep it from starting(or even kicking on these old ones) but of course we can't be too careful. I have the videos marked as "not for kids" but that doesn't always stop them.
I'm getting a little paranoid in my old age cause I witnessed a little girl 4 yrs old in Calgary, Alberta ( who was visiting from Yugaslavia) lose 3 fingers when she copied her uncle clearing some grass from the 'EDGE' of the running mower. SHE SAW AND 'RAN' OVER TO HELP. He knew how far to reach in........SHE DIDN'T UNDERSTAND. I witnessed this in front of my eyes and I'm still bothered by it. I certainly loved your video though. Keep them coming.
@@philhugill8458 I couldn't imagine having to see something like that. I am sure you would agree that having kids that age near a running lawn mower is always a bad idea, they think they are immortal and don't appreciate the inherent dangers of motors and blades.
I am taking what you said to heart. I am going to make it a point to talk about safety more when I am doing videos. People watching don't always know I checked the brakes and switches before getting under it and it's worth mentioning every time.
(The idea of putting my fingers under a running mower gives me chills)
Would have helped more to show original symptom vs just describing it.
I agree. I was still learning when I made that one, I am much better about it now. 😁
Turns blade wi spark plug wire on....
Yeah, I had my hand slapped for that one🙂. I know it's not impossible but I haven't seen a mower start that way yet. (I added the "yet" because "not impossible" and Murphy's Law are best friends)
Very Good!... 16 🐄🦉🏴☠✝
Thanks!
You didn't show exactly what you were doing skimmed over the procedure to quickly
Sorry about that. I have better video equipment now and i can get much better angles. It was definitely a quick fix. What happened here was that the valves in this motor each had a retainer between the rocker arm and the spring and one fell out, causing the backfire.
You can put the retainer back by hand, then use it to conpress the valve, then move the rocker arm back into place.
After that you rotate the blade until both valves are closed(rockers are both "up") and set the lash(gap under the rocker).
The lash isn't nearly as picky on single cylinder engines due to them running at pretty low RPM(under 4000 rpm floored)
It's cold(snowing in Dallas, go figure) I wasn't watching and when I clicked "reply" in the email it used my other page(I am thinking that's a bug in the software!). That was me replying!😁
@@GuysPlayingWithTools