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- เผยแพร่เมื่อ 19 ธ.ค. 2024
- There are more than just the 3 basic reasons a petrol lawnmower won't start spark/fuel/compression are just the basic ones.
I go through all the other reasons a petrol lawnmower won't start that I have found by repairing hundreds of mowers over the years.
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That was the best video that I have ever seen. No jargon, straight to the point, very clear description and understandable. Brilliant. Ray
Hi Paul, Great video - my problem was that the primer wasn't actually doing anything. Cleaned it, the fuel sprayed correctly and mow fired right up! Thanks a million. I owe you a pint!
Good afternoon, can you please help me with my Mountfield HP 164 which has to be primed every time before you start it. I have fitted a new carburettor and spark plug. Best regards Ray
Hi Paul, I watch all your videos and think they are very informative, I have since obtained my first mower to fix up for £15, it's a champion, just sold it today for at least double my money, big thanks to you and retrorestore !!! I had never fixed up one before, can't wait till next one.
That's what its all about! Excellent enjoy the profit!
My Honda mower had a loose blade and damaged kill switch , n believe me I done many man hours of research, I rest the flywheel key, reset valves carb clean, plug change, coil clean , for something so simple 🤦♂️, but my sp555v is running sweet now ..thanks to these videos
Hi Paul, very good clear videos, I have a Einhell lawnmower that sometimes starts but then after 5 mins stalls and I can smoke at the exhaust side of the engine, what could it be . ? Any tips Thanks
Great video. Just fixed my neighbor's Mountfield mower. Spike plug lead trapped after the the recoil unit replaced. Many thanks
awesome
Thanks for this great video. It's amazing how much impact the diaphragm has on a mower running bad or not at all. Just over 3 quid for the two bits and a good carb clean and from not starting, and or shaking and coughing like me with the flu, I now have a happy mower purring like a kitten 🙂
Happy days!
Hi Paul, i have just watched all your videos from this channel and most from your other channel too. This video is yet another great example with clear, easy to under stand information, your videos are great fun to watch. Thank you for all that you do
.all the best Richard
Richard Thompson Thanks Richard I appreciate that!
Thanks for the video got my old lawn mower going cheers again
Excellent
Great help. Keep up the good that you do.👍
Hi Paul, thanks for the very informative video, which gave a non-mechanic like me enough confidence to clean my Mountfield SP160 carb. However, once cleaned the engine was still searching as before with engine coughs and oscillating power. What would be your next diagnostic step please if you've already cleaned air filter, spark plug and put new fuel into the beast? Many thanks, Neil
Great, I’ll be taking mine bits tomorrow 👍
Nice one Paul good video David
David Brewer Thanks David I do my best!
Hi, my mower starts on 3rd pull, smokes heavily and conks out? Briggs and Stratton, fairly new mower. Fuel good, plug a little sooty, so cleaned and fine sanded it, and fuel getting through. Leave for a day and exactly the same thing happens. Been going on for four days and it looks like rain !
Any ideas ? I would be very grateful, and thank you so very much for the video.
Rick A
Thanks Mr Mowerman. Good presentation. But I'm just a female who wants to cut the bloody grass and get this beast of a thing to start so I can get the job done. The mechanics and technology of things is interesting but. I don't have the time to stuff around with the intricacies of mechanics and technology. And after many arguments with men in my family trying to teach me how it all works and getting angry at my wreckless impatience to just get the work done, I have decided it is worth paying an exert mower repair man to service this beast of a machine so it works. I fed it, I was very nice to it. I brushed and cleaned it with loving care, begged it to start but it justmade a few grunting noises after I wore myself out pulling the cord about 20 times and all this dirty looking foul smoke came out of it. This bastard obviously doesn't seem to like me very much. So it sounds like a job for expert males to handle.
Annemarie May How very sexist! I'm sure if you change the diaphragm and gasket it will play nicely! There's plenty of top female mechanics !
@@MowerMan There's also plenty of wannabe comedians on TH-cam. I think you've been stitched-up if you think this was a woman who wrote the original comment. "Annemarie" is probably an Andrew or Alexander in real life. Admittedly, I laughed heartily at "fed it". To add fuel and refer to it as "fed it" was pretty original. 😂
Good vid, thanks. For me personally, getting to about halfway thru when you start talking about, and setting about, timing problems, then this is when I say it's better to ditch this mower, it's had it, and buy a new one, because unlike a couple of decades ago when petrol mowers were very expensive, they are now very affordable; a cheapie now can be only about 79 quid, all new and guaranteed.
Paul, I've checked for compression and spark and all is ok. No blockages in the fuel line, new primer bulb and I've cleaned out the carb. All good but still would'nt start. Turned out to be vacuum seal on the petrol fuel cap!! If I remove the cap and prime it I can see bubbles, refit cap and it starts every time. There's no obvious breather hole in the cap. Have you come across this before?
Nice one mowerman, thanks.
Great vid full of very useful information. Cheers Malcolm
All your videos are great and you do a fantastic job at describing and demonstrating things. I really dont understand why there arent many, many more subscribers for such a great quality channel.
mowwow1998 Thanks I appreciate that!
my engine was surging so after watching your vid ,decided to service my carburetor every thing went weii till i triedto remove the nut on top of the main jet it is stuck solid and i have stripped the screw driver slot any idea how i can remove or is it a new carb
Thanks for the information, I think people who give thumbs down do it just out of badness.
Graham Brooke Thanks! I don't worry about it tbh!
Hi I've got a Mountfield petrol mower which is less than 12 months old I'm having problems with it stopping and not restarting. I've drained the tank of the old fuel (Advised by serviceline) also bled the fuel system but this hasn't sorted the problem the local dealer has said that its probably fuel crystallisation which isn't covered under warranty and wants £40 to immerse the carb in a sonic tank(or something like that) is this a common fault because of stale fuel?
Hi , I bought mount field in Nz . Can you confirm the blade bolt threads are clockwise or anticlockwise ? Seems it’s stuck and I don’t want to be too hard on it
Hello Paul, I've got a 2.5 yr old Sovereign XSS40A. Just wont start. Had problems after I gave it an oil change. I've had it bits. Carb ok, apart from butterfly valve spring which I rectified. Ignition coil ohms tested ok as did spark plug (new one & the old one) Even had cylinder head off to check valves ok. Dead man switch wire ok. Though if that was broken should stop it starting. Fly wheel in alignment. I'm at a lose. My eye sight isn't that good. When wife pulls the cord I cannot see a spark though plugs tests ok & gap is set correctly. 0.7 to 0.8 mm. On the odd occasion when I did get it to start it seems to backfire. But flywheel is aligned. Help. Regards Stephen
Could the 5th thing be a blocked exhaust? I took the cylinder head off, and it was heavily coked-up. It's got really bad kickback when cold starting, but the flywheel and blade don't have any play. Although I can't get the flywheel off, the key seems it good condition. I don't think it's the timing, but perhaps a restricted exhaust port might be the next area I check.
elo paul, i have 2 machines wont start both flat heads techumsa vantage & b&s both have compression' 'spark'carbuettors cleaned !! do you think the next step would be to the clearence on the valve stems befor i take the heads of to check the valve seets' keyways are okay any ideas would be much appreciated & were are you based at? great video's i am only self tort & in my 80's thanks pal
dennis pratt Hi Dennis if you definitely have spark compression and fuel going through In theory it should start. Usually if it doesn't it's down to timing.!are you using new petrol? You could buy a can of quick start? Remove the spark plug and spray some in then quickly replace the plug and try to start the mower. It it runs for a few seconds then dies you can be sure you still have a fuel starvation problem probably from the carburettor. Also if the lawnmower has a fuel tap make sure it's turned on. Be surely to checkout this article also
repairlawnmowersforprofit.com/pertrol-lawnmower-wont-start-help-and-repair/
Hello.i have topcraft petrol lawnmower Italian made from the 90s It's similar to the mountfield .It's on good shape but hasn't run for almost 20 years .I tried starting it ,but the start rope lever was stuck when I pulled it petrol leaked from the engine i thought I had flooded the engine .I emptied some oil out and changed the spark plug,I also noticed the air filter was falling to bits .I tried starting and it almost went but stopped repeatedly will trying to start. Can this be my air filter needing replaced ? Thanks !
Great video really helpfull
Bailey’s Lawn care Thanks!
Donyboy 73 uses a harmonic balancer puller
I’ve tried pressing the primer bulb on Rs100 and I can not see the fuel picking up could it be a blocked carb
make your own good quality threaded rod and thick flat bar with elongated holes for the bar for adjustment of your own design
Scottish Prepper Thanks for the advice i'll look into it!
mgive it a try making it ?
Quarter 20 thread i think.
you can make it very cheaply strong and versatile
I had a similar idea to this. Any clue what the threaded dimensions are for this particular flywheel (B&S part 795549)?
M4 is too small, and M5 is too big, so I'm guessing it's not metric, or the threads on my flywheel have been stripped by a previous bodger.
Hi. Just bought a second hand 49.3cc sovereign mower, it seems like there petrol in the oil and when it’s started I’m guessing it’s black petrol coming out the exhaust, it starts but it’s smokey, heads up would be great, thank you
01arron Change the oil and put fresh fuel in. Run it for a good 5 minutes till the oil burns off. Sounds like it's been tipped over
Thank you Mower Man, oils all burnt off now, runs perfect
Hi loncin 196cc lawnmower i have spark with a tester but not with a plug tried a dozen plugs new & of another working machine no spark I'm,e baffled ! have you come across this before! i had it on a briggs &s before kill wire on &off, if the timing was out it would show a spark at some time
Well I had another go at trying to start mine today, after a year or so of it being unused. I got a good spark at the plug, I saw that with my own eyes, and was surprised as it is so lifeless I thought it was no spark stopping it from starting. Then I tested the compression, with my gauge, and that's good too. So then I drained all the petrol out, from the tank and carb, it was newly filled anyway of course, but I thought some old stale petrol might be in there, and filled it with fresh. Pressed the primer to get it pushed along. So with a good normal spark, good normal compression, and fresh petrol, I thought it must start, because why would'nt it. But it did'nt. I tried and tried and tried and tried, pulling on that cord hundreds of times, and there was no life there at all. It did not even show the slightest sign of firing up. It always used to start and go alright. I did'nt leave it a year ago because it would'nt go, when it was stored it had been working fine. What on earth is wrong with it now? I suppose now, after watching your video, I have to start looking into timing, with that square pin you show, and then the valves. Something is preventing it from even wanting to start. It's a Techumseh engine btw. I'll never be able to put it back together again, but I'll have to take it all apart just because I'm compelled to know why it would'nt start. I feel like beating it to bits with a sledgehammer, like Basil Fawlty with his car. But I'm instead going to carefully remove all its nuts and bolts, have a good look inside to see what the problem was, and then, after day after day after day after day of keep trying to start it with no luck, I'm going to have the last laugh on it as I chuck it bit by bit into the wheelie bin, uttering lots of scathing verbal abuse to it as it goes in the bin. Alan, in Norfolk.
alan may Alan.If it worked ok last time you put it away it can't possibly be the timing. It sounds like everything is ok apart from you are not getting fuel from the carb to the plug. You need to service the carb. There will be a blockage in there.
@@MowerMan I did get it going, to my surprise, and actually it works just great now and I celebrated this by making a nice neat job of my lawn, which was about 8inches high. It was a simple fix; undid the bolt underneath the fuel/float chamber, removed it, leaving the chamber body in place as it was stuck there anyway due to 20yrs of being there 'fused' in place with the rubber seal, so best left alone rather than pulled away and ripped, and looking very closely at this bolt I saw that the tiny hole in it for the fuel jet was absolutley blocked with hardened 'gunge'. Poking it in with a very small safety pin needle and squirting wd40 thru it with more poking cleaned it out thoroughly . Put it back, filled it with new petrol, primed the rubber button, pulled the startcord and BINGO !!! started straight away and kept on going. Just a tiny blocked hole was all that it was. Thanks for your help, you inspired me to persevere and it paid off, many thanks for your video and reply, best wishes from Alan, in Norfolk.
Great video! Ill keep an eye out on comments as in need of a fly wheel remover as Im having trouble getting mine off. Best wishes Sam
Good information
Hi, got a 2nd hand mountfield lawnmower brigg engine, which eventually starts after 20 pulls, on each pull it starts splutters and stops. Once started runs ok just a bit noisy. A bit of background, ownerhad a mix of diesel and petrol from a cockup at the petrol pump, did not want to throw it away and used it in the mower for approx 2 years. I picked it up thinking a simple maintenance would get it started but no. Wondering if you can give any advice. thanks
concise fact filled video many thanks I am getting an old hayter harrier41 so will be putting your advice to good work many thanks for making the videos
techassyst No problem thanks for watching. Good luck with the Hayter
Great video mate can’t keep up with you and Martin
Hi there mate, I get mowers going as a hobby abit like you. I have bought a champion with honda engine today. Fuel was yellow and very old. It has spark and the basics. After a full carb and fuel lines/tank clean. It still don't start. When pulled over it backfires from both muffler and carb! In fact flames appear out of the carb. Any help would be helpful.
co nor Take the exhaust off and try it. Also make sure the choke works
Was that the problem
Note- I have Honda mowers at work that if the oil is too low the mower won't run.
I love these videos
Expected to see cover for set of points when took flywheel off SP164. Not there! Where are they?
No points just an ignition coil
@@MowerMan That's electronic ignition then. It's more modern than I thought. Thanks
thanks. just been given a mountfield mower and couldn't start it, thought it was broken
I've got 2 Briggs and Stratton mowers that when you pull the pull cord to start, there is a knocking noise? Any experience in what to look for? Thanks
Simon Terrett Do they start? Is the blade bent?
Mower Man 1 starts but knocks quite bad, the other does not start but you can hear the knocking while pulling it over, the blades do spin freely
Somethings not right, check the key way like mowerman did in the video. A slight bit of slackness could be exaggerated through the machine causing the knocking sound.
Also make sure nothing is else is loose and simply needs tightened.
Rob Rusticwoodlandproducts thanks will have another look tomorrow
Good tips Paul . My Briggs tool works well , Perhaps a harmonic puller will do the job.
Cheers Pete.
Did you notice that the word Mowerman is the right way round on your t-shirt at the beginning of the video...but it's inverted at the end? LOL
Andy K Yeah lol!
I think you missed my comment on your previous video Paul...you should have a look at it as I know you'll have a good laugh
Cracking Paul thanks
Bought a sthil 248!pertol lawnmower stopped working after 2 nd time of using any ideas on why this would happen😡
Hi Mowerman , So with my lawnmower It starts and runs well | and when I put it on grass it cuts around 2stripes and cuts out then takes forever to come back on ~ when it does eventually come back on it cuts around 2more then cuts out and I try to start it up and it doesn’t | So I leave it for around 10-20mins then it leeks from the carb with a lot of petrol coming out | now I’ve asked a couple of people they said it needs a good clean and something has wore down so I need this little part I’m just wondering if that’s the case that’s why it’s have them issues
CKF Garden Maintenance If it had the same carburettor and fuel tank as the one in this video it definitely needs the diaphragm and gasket changing. There is a link to how to do that in the description of this video
It’s a Honda engine mate . Honda HRB 476c Petrol lawnmower
CKF Garden Maintenance It sounds like the carburettor needs a service. Make sure the needle isn't getting stuck inside the carburettor
Hi Paul just wanted to ask a question what’s going to be the next mower that’s going to be the next mowers to look for would like to have your opinion David
David Brewer I would take a look at why B and Q are selling each year here in the UK anyway. Mc Culloch was the choice a few years ago so there are a few of them around. It doesn't really matter as all the basic servicing is the same you just need a little common sense to strip them down sometimes
I am trying to repair a Sovereign mower, I have replaced the filter and the bulb, as it was split, but it is not drawing up and shooting out the petrol, can you help please?
Teresa Carter You need to service the carburettor
@@MowerMan I have serviced the carburettor, now it starts but dies within seconds...any tips at all please?
Thanks boss nice one
Good tips Mowerman, but what does namrewom mean on your shirt 🤔😂 . Cheers. Rob.
Rob Rusticwoodlandproducts I was waiting for this. I had to flip the clip horizontally to make the top left becoming the top right. It wasn't that I don't know my right from my left but my camera screen was flipped round so I could see what I was filming lol. I really should have run a competition!
Briggs Diaphragm and gasket. (Main rason for not starting) geni.us/DyxR (Amazon) As an Amazon Associate, I earn from qualifying purchases with no extra cost to you.
My mountfield sp454 only starts when I put petrol in the plug hole what does this mean
Mark Lewis Blocked carb or primer bulb split
@@MowerMan it's not got a primer bulb on it
My mcculloch mover starts but then stops straight away, can anyone help please
Fuel spark timing exhaust electronics and wiring intact and air
On Two Strokes
the spark arrestor screen was completely blocked with black carbon making it hard to start and run
I plugged exhaust will increase back pressure
I think strimmers are the worst for starting troubles
Maybe a video on them please
I've got some coming up
In a nearby kitchen- Cyril, come quick! That madmans back cutting strips of the grass outside. Look he's even smiling to himself.
excellent
Hi how are you
awesome
My petrol lawnmower fucking died
Good information
Thanks!