Mountfield RS 100 Petrol Lawnmower Service (HP414)
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- Опубліковано 29 січ 2025
- In this video, I service a Mountfield lawnmower with a RS 100 Engine model number HP414
I show how to service the carburetor as well as lots of service tips
Link to this lawnmower geni.us/jkNdJ (paid link) As an Amazon Associate, I earn from qualifying purchases
Heres a link to the correct spark plug for this lawnmower
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RS 100 Genuine Mountfield Replacement Carburettor
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First time I've ever serviced my faulty lawnmower, and now it's as good as new! Purrs like a kitten. Great, informative video instructions. Thanks!
Nice work! Enjoy
Absolutely brilliant tutorial thanks for your time and expertise and humour thrown in.
Thanks for this video! I followed this and stripped my RS100 yesterday that had been outside for a while, cover had blown off, old fuel and wouldn't start at all - dead! Fuel was getting to the carb but after stripping the carb jet was blocked so i gave it a full service and it started straight away thanks!
David Noakes Thats brilliant David! Glad to help
Great video, thanks! Helped me diagnose and fix my mower's gunked up carburettor. Your website seems to be defunct - assume you knew but just in case you didn't!
Many thanks! Yeah the website dead! Appreciate the super thanks!
Brilliant, informative video. Really grateful for your insight and expertise. Got my lawnmower up and running for £0.00!! Carburettor was full of rust and all blocked up, cleaned up and good as new now!
fantastic
I really enjoy your videos. I have the same model with the same issue but when I saw how fiddly it was accessing the carburettor I thought straight down the repair shop as I couldn’t handle the stress. Thank you 👌
Many thanks!
Great presentation -crystal clear. Love the gentle vein of humour. Also the manner of delivery was not at all condescending. I watched this video because I have a problem with my fuel line but ended up watching it all. Reason? It was informative and engaging. Much appreciated.
Thanks Ian much appreciated
Great video my mower did not start even with carb cleaner or engine start but after stripping down the carb clean all the holes and removing all the crud it started and runs as new. This video was not boring very informative. Learnt a lot with your tips and little tricks.
Thanks Mower Man, just watched this video and managed to HP414 back up and running. The stainless bush on air filter housing even fell out exactly as it did during the video. My issues were mouse related, little darling had chewed the hose from the primer bulb. Managed to replace it with a pipe I had left over from a strimmer repair. Your video gave me the confidence to remove the carb and clean all that down at the same time. Buying an equivalent SP Mower in B&Q today would be £250, so you have saved me a fortune. Much appreciated.
That's great Donald! nice work!
Thanks mate - excellent, clear, easy to follow video. I serviced my carb exactly as you said, and the mower started first pull and is running sweetly. Much obliged!
Excellent video, thanks. When draining the carb, the air filter cover makes an ideal tray to catch the fuel.
Outstanding video, thank you. I have now found the source of my mower problems and I'm heading to your site!
Hi ya mate. I appreciated your tutorial video so much that the least I can do is give yourself and any future viewers an update..?
I take my hat off to ya mate...🙌👏. I got straight home from work today and followed each step of this video again to strip, clean and rebuild the carburetor. I wouldn't have achieved this without your help. The job was a complete success in just one attempt. Everything you said and did in this video is absolutely spot on. There was lots of gunk in the carb and even some rusty water in the bowl. Cleaned and scrubbed everything,...removed the jets and unblocked the clogged holes etc. Bolted everything back onto the mower,......kept pumping the primer bulb until I saw petrol squirt out in the carb,......and on the 2nd pull it fired up and purred like a kitten again...!! Unbelievable. I'm really chuffed mate. I mowed the back lawn as a tester to make sure I'd got everything right. It hasn't run this smooth since the day I bought it from new. And that's no exaggeration!
*FOR ANYONE WITH A MOUNTFIELD CARBURETOR PROBLEM WHO IS SCROLLING THROUGH THESE COMMENTS WONDERING IF THIS VIDEO IS WORTH WATCHING..? THE ANSWER IS A BIG 'YES'. WATCH AND FOLLOW THE EASY TO UNDERSTAND INSTRUCTIONS ON THIS VIDEO, AND I GUARANTEE YOU ALL 100% THAT YOUR MOWER WILL BE UP AND RUNNING LIKE NEW IN NO TIME AT ALL* 🤝👌💪👍😊
Thank 7sins I appreciate that!
@@MowerMan no worries mate. You deserve it. I did the front lawn after work today. First pull and it was up and running. I'm glad I decided to have a go at it myself after watching your video. Respect to ya for giving up your time to make this video in order to try and help others like myself. 🤝👏👏👌👍😊
Just had a crack at swapping the carbureetor over on my Mountfield as a first timer. All done all working can't thank you enough 👍👍👍👍
Great video, just cleaned out the carb on my RS100 HP414 as it was hunting.. Following your instructions, it now runs like a dream...
I have this exact mower but it never ran quite as sweet it would take approx 20 - 25 mins to get running. So I watched this video and stripped it down, cleaned the carb out and cleaned the spark plug and it now runs perfect ! No excess revs no stutter ! Perfect thank you very much for sharing this video
Great stuff!
Fantastic video, was close to binning my Mountfield RS 100 Petrol Lawnmower (HP414) and having followed your video and servicing the carburetor it is up & running again :)
Just got this mower free it runs n dies a good service is all it needs il have a bash at weekend thanks
👏👏👏.....cheers for this mate. Nice one. I've had my mountfield RS 100 for about 3 yrs now. I bought it from new. But for the first time in 3yrs it wouldn't start. Eventually I managed to fire it up but it wouldn't tick over and kept conking out..? I re fueled it with fresh premium petrol,...cleaned the spark plug and tested for a spark. All good. But it didn't fix the problem. I checked the fuel was reaching the carb, and I checked the primer bulb was working. All good. But it still didn't fix the problem. My mate said it sounded like it was something to do with the carb..? I got as far as removing the air filter box and the top cowling etc, but I couldn't work out how to remove the carb cos of that long thin spring and the linkage. I've never taken a carb apart in my life before, but after watching your superb tutorial video this evening I can't wait until I get home from work tomorrow and go out into the garden with my tools and my tablet to watch this video again as I follow you each step of the way. I was not confident at all about attempting to strip and clean the carb cos I've never done anything like this in my life. But I'm really happy and confident after searching UA-cam for ...
"Mountfield RS 100 won't start" ....
And seeing your video at the top of the league. You certainly know your stuff mate, and the way you have presented this tutorial is so easy to take everything onboard and understand exactly what to do cos you haven't gone into any confusing technical rubbish that I don't need to know. Short ,...sweet,...and straight to the point. Excellent stuff. I've now subscribed to your channel mate. Well done, and thankyou very much. 👌👏👏👏🤝🤝🤝😊👍
Thanks a lot! I really appreciate that!
@@MowerMan you're welcome mate. Great video. I've got my socket set out ready for when I get home, and my uncle is gonna drop me round a can of carb cleaner spray tomorrow. I'm looking forward to the project for sure. By tomorrow evening I'll be posting again to let you now how it all went. I know what the problem is, but I didn't know how to go about it. But thanks to you,....I know 100% that my mountfield RS 100 will be up and running again by approx 6pm tomorrow. Watch this space...! 😉💪👊💥🤝👍👍
Boss video. Great step by step instructions, easy to follow and helped me fix my mower. Thank you so much for this content 👍🏻
Thanks! much appreciated
Thank you so much for this video. I actually managed to clean my carburettor on this same lawn mower. And it worked! I’ve never done anything like this before.
Amazing clear and helpful video. I have already recommended your videos to my neighbour. I was so chuffed. Thank you.
Fantastic! hope they subscribed!
I've got an RS100 which after winter it has all of a sudden decided to stop starting, when it was a first start mower before Christmas! Going to drain the fuel as you mentioned first to give fresh fuel running through, after that if no luck I will clean the carb out... looks straight forward top man!
Check there isn't a filter in the fuel line
@@MowerMan what you mean filter? Blockage? I can see fuel coming through via the red button
@@Jonbuildz the fuel pipe that runs from the tank to the carb. Take it off and make sure there isn't a filter in the tube/pipe. Some newer models have this and it gets clogged easily
@@MowerMan cheers mate will let you know how I get on.
Have an EP414 (RS100) and used your guide to take apart the carb on a machine which had been working 5 minutes earlier but had decided it had had enough. Few minutes of swearing and spraying later and it was up and running again. Cheers!
timne0 Well done!
Genius - I have this mower and was able to give it a service thanks to your simple to follow and amusing videos. Excellent work
Just picked one of these up for free, never had one before, just grabbed a drink going to watch this before I strip it down, cheers for the vid!
Thanks to your brilliant video I managed to take off my Mountfield RS100 carburettor, service it and get it back on running.
Thanks for all the information. Lots of us seem to have similar problems with this engine. I do think that modern fuels don’t help as we don’t know exactly what gets added to them, and they are biased towards fuel injection and not humble carburettors. You’ve saved me a lot of work, thanks.
Thanks a lot, I have the confidence and knowledge to carry out open heart surgery on my little mower, saves me taking it to the repair shop, much appreciated
Excellent Pat!
Definitely feeling accomplished after watching this. Thanks for the emphatic walk around whilst it was running too! New Sub here.
Thanks John
Great video's and tutorials on mower repairs that have given me confidence to repair my mowers and others too. Concerning the Mountfield RS100 and similar types, have you got any video's on drive belt replacement?
Thanks for taking the time to make this video. Had one of these for several years now I know ow to service it. Easy to follow and very informative and love the humour. Gordon
Thanks Gordon!
Cleaned the carb following your instructions and hey presto a working machine again
Thanks
Left my Mountfield in the rain and now it wont turn over. Will do everything youve done in this vid and hopefully it will be fine.
Great video thanks. There were no obvious signs of gunk inside the carb but I cleaned it all out anyway and it runs a treat. No more surging!!
Thank you. Just getting mine ready for this year and it wouldn't start. I cleaned the spark plug put it back together and after a few splutters off it went. I looked at a few videos but yours is most definitely the best.
Glad it helped
Thanks for the video.. Just picked up one of these but with the self propelled option. Previous owner said it would sometimes cut out and erratic idle. Will do the carb maint and hopefully it will fix it..
Also, when I tipped it on its side to quickly check the blade, some fuel seemed to run out from where the carb is, will check that out also.
Thanks have a Stiga rs100 which was running for 5 minutes , hunting then cut out. Did the carb cleanup as shown and still hunting found out I had replaced in line filter with home brew motor Bike filter which I had pinched too tight with hose clamp and flow rate was real low . turned out it just ran for the full bowl then cut out , then of course bowl would fill again and run for another 5 minutes. Drove me nuts but your tips lead me to the fuel issue. Martin
Brill video, followed instructions now mower flying. 👍👍
Hi great video. I had the hunting problem last year, cleaned carb and put back three times but still bad. Eventually I found another black plastic jet, i think, on the top by the plastic throttle control, cleaned it and cured it. Might have been coincidence but just started it today and still ok.
Same here. The black plastic plug is the low speed jet. I had to take that out and clean it to cure the hunting on my machine.
Awsome video iv just picked up the same mower for free yesterday had have the same issue no fuel coming through so I assume a good clean of the carb and she will fire up hopefully I know it fire up as iv put petrol down the spark plug and it fired up thay way
I've got the same RS100 that I've had from new for about 7 years - it started hunting quite badly yesterday, so found this vid on servicing the carb. Did it today as per this video and it's like a brand new mower! I think it might even sound louder than it ever has done! Dead easy job to do, too.
James Love Glad to help!
I inherited one of these from an artificial grass convert. It had a split fuel hose and has worked first pull ever since. Until I ran it on the bottle of petrol that lives on the bench for cleaning sticky marks. It was hunting which is why I’m here. Have tightened the carb screw to get it revving until the clean fuel finds it way round. How does the right angle part at 26:00 govern the running?
Thanks so much for taking the time to do this video and going through it in detail! I have just managed to clean the carb on mine and it now starts! Has saved me a few quid and now I have a better idea on how to tackle these sorts of problems in future 👍
Excellent Steve!
I have a 414 mountfield lawnmower too since 2011 and still running with super unleaded from shell
Brilliant , just serviced the same mower thanks to your video. Running smooth , thank you fella.
Just saved me around £200 watching this video top man 👍👍👍
Excellent!
Didn’t have to take off the white float though to get to the centre jet should I have?
Thanks, fixed my old Mountfield mower with this video. Be sure to check/WD40 the linkages and springs that connect to the carb - this was a slight issue on mine too.
Great video, with a full explanation. I will now go and service my carb, Fingers crossed.
Go for it John!
Absolute legend. I just managed to get my mower working again thanks to you!!
Great video. I have a mountfield with RV100 engine. Fitted a new carb but it will only restart by using the primer bulb, even when warm??????
Hi,
Great video! I've just serviced my carburettor following your very easy steps. My mountfield rs100 still doesn't sound right though. I've got a video of it, is there anyway I can send it you and see if you know what's wrong with it?
Many thanks for the video again, absolutely brilliant 👍🏻
💯% for your step by step instructions video on servicing a mountfield RS100 mower.. now feel confident in doing a carburettor clean myself.. this is definitely gonna save me a few quid! 👍👌
Great to hear!
Great video I have the same lawnmower which has a damaged fuel line. Thanks for posting.
That's all very well and good... but how does one refit the drive belt which goes from the transmission box to the cutting blade?
Thanks, was given the self propelled version of this - same non starting issue which I diagnosed down to fuel in pretty much the same way (quite pleased with myself having now watched this 😂) - took carb apart logically - seemed very simple compared to the Briggs ones I have seen - all cleaned up and starts on the primer but won’t run 😢 have had the jet out and cleaned it again and again but can’t figure out why fuel isn’t being drawn up when running 🤔
I've got the same problem. Did you manage to sort it? I even put a new carb on as the old one was horrendous, but it's still the same.
@@andylees8735 not yet, it's on my list of jobs to do! I inadvertently ordered the same style carb but with a choke butterfly which wasn't obvious in the photos - oops - the casting seems to be identical as do the jets etc, but there appears to be an extra screw for adjusting something (high speed mix maybe?) which is blocked off on the old one. I was going to try to mix and match the jets, seals etc and move them over to the original to see if that worked, then worst case try to use the new one as it is...fortunately I was then offered another mower to get the jungle under control, again with a carb issue 🤦♂ which I managed to get going by jamming the throttle open with a stick once I'd cleaned it 😁
@@Umski Out of sheer frustration, I've taken the fuel filter off and redlined it best I could for a few minutes and now it will run independent. I think I have a similar carb to you in that it has some extra bits on it compared to the original. I've left everything as it was, although if that is a mix screw I might have a tinker with it.
Mine seems fine now its warm and I think the fuel filter might not have been helping. I'll have to get a new one.
Thanks for responding. The stick comment gave me a laugh. All approaches are valid if they work!!
😃
@@andylees8735 nice one 👍 thanks for the tip, I might try that too - could be that the fuel filter is restricting flow to the float bowl 🤔 I kind of assumed it was okay as the bowl was always full on disassembly but it could be just trickling I guess so on throttle it conks out…
@@andylees8735 so after your tip, I tried the old carb with the new black insert (my old one had a failed o-ring) - still no joy, so swapped out the main jet too and tried again. I realised it was just conking out due to the governor closing the throttle so I tried jamming it open which seemed to do the trick - I adjusted the idle screw where it's now running a fastish speed which prevents it spluttering out - it seems to run fine otherwise albeit sounds a little lethargic if it's loaded - I don't think it was the jet after all but didn't want to take it all apart to check again! So I've left it as is and did a few jobs - such a joy to use compared to the old heavy steel decked 18" one I had and even the other steely! That said it seems to clog up more easily on longer stuff and the grass collector is a little on the small side for me! Then just to annoy me I filled it up this morning and it started leaking under the fuel tank 🤦♂ - I found the filter as a result though - just need some new fuel pipe now!
I have that model, you can get the sparkplug cap off without removing the top, it's probably easier while not holding a camera. its the fuel line stopping you get the carb off the studs.
Thanks a lot for this video, my mower is now running sweet as a nut -THANKS
Hey can you help me,i jave a same mower how do i change the oil?
ua-cam.com/video/IjEugxBCLqE/v-deo.htmlsi=S8L5E8bPd4Os7KZs
@@MowerMan thanks but i wanted to know where is the screw on the engine for oil.i preffer that way when the oil leaks fron that hole
Lovely job. Great video. 👍
Hi. I followed your video and cleaned the carb out along with checking fuel line. spark plug and fully emptying petrol tank. I'd got some oil mixed in with the petrol previously and it wouldn't start. Now it is starting but only runs very briefly before cutting out again. Could there be another blockage elsewhere?
Thank you mate, was just about to replace my mower, watched this video serviced the carb how you said and £10.00 later on carb cleaner and a fine cleaning kit and all sorted, well happy, thank you so much..
Damian gilbert Brilliant Damian!
Great video one small issue you missed off the push in breather jet. You have to remove the idle screw adjustment to get it out. If this jet is block it can cause surging!
This was the most informative video like this ive ever seen .. well done and thank you :)
I had same issue , did everthing you did and it worked like a dream for most of my garden .. but now it revs up and down and up and down , any ideas what thos could be ?
blocked jets , clean it again!
or crap petrol!
Hi, I have noticed a hole on top of the fuel primer bulb. Should it have one? Just wanted to check before I start cleaning the carb. The spark plug is sparking but no fuel appears to be getting to it. Thanks.
👍 We just followed your vid and fixed pur mower. Thank you so much.
Ive got.the same mower hardly used from new.
Starts runs sound but if the grass. 3/3 inches tall it stalls easily.
It's jet washed.off and clean as new. Underneath. Can you adjust the feature whichever stlalls it ?
Great video, I was having problems how to unhook the springs not wanting to break them. them, worked a treat. Thanks Mower Man
Glad to be of assistance!
Great video Mower Man. I have a Mountfield 414, stripped it and cleaned it with carb spray, put it all back together again, and it is still surging and hunting. Am I missing something? Checked the spark plug with multimeter, all fine, plus checked the ignition coil with multimeter, all fine there too. Bulb was pressing fine, no leaks and whilst stripping the carb down I could see the petrol seeping out when bulb was pressed. Any other suggestions?
Great Video. i have same Mower got it for £15.00 from car boot sale in Feb. Came with a spare carb as well the only problem i have it runs uneven, hunts and surges. I suspect carb needs a good clean the jet screw in the spare carb will not budge either, obviously previous owner just swapped carbs then left it full of old fuel over the winter again also looks like the air filter has seen better days.
A Driver, mine was running rough. I’ve just replaced the throttle spring as it has stretched over winter, all sorted.
Awesome video.
Would you have any idea what would cause the revs to fluctuate? Then when I go to cut it conks out.
New fuel line, cleaned the carb, am stuck as to why it does this.
Help appreciated buddy 👊🙏🏻
Hi there. Thanks for your great video! I've just got myself a secondhand HP414 which I was told was misfiring. It's missing the air filter and cover. I went to try to start it today and it caught fire at the hole where you can see the primer pumping fuel. What could be the cause of this? Some kind of seal or too much fuel in that hole? Any help would be greatly appreciated :)
Brilliant. Mower works again now. Thank you very much. Very helpful
Top video, well made, you're a natural presenter.
Hi do you know were you can get the 2 metal sleeves were the air filter box is
Thanks for this tutorial I fixed my mower xxx
Awesome
Thank you for a straight talking, easy to follow tutorial.
That’s my Mountfield RS100 HP414 serviced and running like a dream. The spark plug needed a good clean with a wire brush and came up like new.
Thanks for your help. 👍🏻
Gordon Constable Brilliant!! Thanks Gordon!!
I can not thank you enough,This video is way up there with the best,infact I personaly think it is the BEST. THANKS FROM Ken.
Glad you enjoyed it
Great video, my RS 100 was running rough took some of your tips on board . Runs smashing now .
Great to hear!
Hi, I have one too and what I don't know is where the thin cable goes to in the handle please ????
Brilliant video!! Really, really useful. Many thanks.
Great video thank you, precise, clear and very helpful. It inspired me to do my own first full service on my spare HP414 which was not starting, and now goes a treat so a big thank you to you. Always better and cheaper if you can do it yourself and for others. Have subscribed (and yes the joke did make me and my mates laugh!)
I have a mountfield hedge trimmer which requires a fuel/oil mix. I also have a mountfield rs100 lawnmower which has separate fuel and oil inlets. I have to mix the oil and fuel for the hedge trimmer, can I put this in the lawnmower as I don't want to get separate fuel for both?
Hi have so 474 mountfield changed carb as was not working cheques for spark fine,compression is good 90psi cold 120 when warm, it only runners on choke for few seconds and then dies cant seem to get what's wrong and help would be greatly appreciated its reacking my head cheers ali
Video came just at the right Time, Bought the same Mower Today the Self Propelled Model, Seller Bought New last Year, said He Paid £160 for it at B&Q............Petrol Pipe has split, so hopefully an easy Repair .
Pigeon World Forum Excellent should be a nice easy fix!
@@MowerMan I hope so Paul, lets hope there`s no hidden problems I don`t know about yet eh..........
what a guy - great channel and website
nick hayden Thanks Nick!
Fantastic video! The pantomime part made me chuckle! That earns you my sub. I have this mower, an RS100 engine Mountfield HP41 and it fires and runs stutters and dies, tried cleaning the carb as shown and it works better runs for a little longer, but still dies. Just wondering if you could suggest what else to do? Did I not clean something properly? Thanks again for a Fantastic video!
Pull the fuel pipe off where it meets the tank and see if theres a filter inside the fuel line. Remove it if there is.
Did you ever state what size the o ring/seal was in the carb that warped? I did the same despite watching your video. So need to know what to buy to replace it. Thanks.
Brilliant video really well explained. My mower is now sorted.👍Thanks.
Awesome!
what in fact is holding the carb on is the fuel pipe from the tank, squeeze the clip on the carb end and ease it off. You can then ease the carb off the studs and flick the thin spring off and then the rod. Top tip, be careful with the pipe as they do go hard and will break ease it off with a flat bladed screwdriver.
Precisely. I serviced my Sp414 this weekend. Just disconnecting the pipe on the right of the carb. will ease removal of it. The collar that fell off is to locate the inlet gasket properly. The collar floats and goes on the carb first, not in the plastic cover.
I still have an issue. I got the the point of taking the carb apart before I watched this and eve. I’ve don’t all that now, the mower starts but it dies after a 5 seconds. What could cause this? I’ve fitted new fuel line and spark plug too.
Just bought this mower it's lightweight runs well and starts OK but when mowing and the grass colecter gets a 3rd full it hunts struggles and cons out when empty grass it's runs OK again just had full service had a more powerful 1 before this and could fill grass box no problem?
Great video, I've just been given one of these mountfield rs 100 it supposed to run, I will be giving it it's first run out in the next couple of days but if it doesn't I can revert back to this brilliant video. 👏👍👍
Thanks Jonathan
Great video. Even better if you watch with the auto-captions on and it describes how you'll be showing us how to repair llamas for profit...
I’ve just obtained a mountfield Sv 150 with no spark. Do you think this could be a faulty coil. Some times it will spark but very weak. I would really appreciate your thoughts.
Where are you in Yorkshire?
It looks similar to the sovereign I bought that got stuck.. I changed the spark plug and it's still stuck ...great video
Had to bin my sovereign. It lasted 1 Yr. My rs100 mountfield has lasted 3yrs
How do you change the oil please - tip it out of the filler neck?
ua-cam.com/video/IjEugxBCLqE/v-deo.htmlsi=DsPXBeoOmP4C7D1-
Hey mower man, loved the video it walked me through step by step and I followed it all. Only issue being that when I start my mower after servicing it, it only runs for a minute then cuts out. Any ideas?
Great video as always mate. I’m having real trouble with my mountfield mower and it’s starting to drive me mad - I’ve got no spark. I’ve replaced the plug, the coil and adjusted the gap between the coil and the flywheel. Could it be the the little electronic kill switch The is engaged by the leaver on the handle?
Before I realised there was no spark, I cleaned the carburettor and fuel lines 😫
most likely the little thin wire that runs from the kill switch to the coil. Let me know!
cheers pal, really handy, up and running once again :)