Mountfield SV 150 Lawnmower Engine Revs Up And Down Help
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- Опубліковано 31 бер 2019
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In this video, I show a few common problems that make an sv 150 engine hunt and surge and rev up and down!
These engines are prone to hunting. Servicing the carburettor is recommended first and then set the idle speed
Here's a whole video playlist on all my sv150 videos.
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Great video, plenty of excellent advice.
Hi, everyone. And Hello Mower Man. I am sure you will have covered this in a video somewhere and I apologise if this is going over old ground but I thought I would share my experience.
A few months ago, I bought a "Mountfield" self-propelled mower with an RS100 motor. It was pretty well near new but had been stored dry for a winter. I put fuel in and after a few pulls it started. However, the first time I used it in anger it started to hunt and has done so ever since. I took it to a friend for advice and we were both left scratching our heads. We found and watched a couple of your videos and visually inspected the carb with all its springs and levers. Everything appeared to be working correctly. Then I started the engine again and my friend said open the throttle fully and see if it revs. I tried and no matter where I put the leaver the revs remained the same and the engine continued to hunt. That’s when he had a “slap the forehead moment” and showed me that the plastic housing around the throttle leaver was broken, just at the point where the cable enters. It is meant to grip the outer casing on the cable so that when you move the leaver the wire moves back and forth inside and operates the throttle at the carb. We managed a temporary fix by locating the end of the cable where it was supposed to sit and the securing it to the metal handlebar with cable ties. The throttle now works and the engine responds and does not hunt. So if anyone has a problem with their engine hunting, before you start stripping the carb just check the other end of the throttle cable it might save you a lot of time 😊 I looked online and the Throttle leaver unit is available for around £20. And from the comments left this is clearly a very common problem. The plastic is simply not man enough for the job.
This reminds us why we love the Briggs classic so much!!!!
BluejuiceT4 Long live the 35 classic!!!
Amen bro!
Paul I fix mine with your other video.. And sold it now. Thanks again
Ger wkm That's great to hear!!
nicely explained mate great video
The number of times I took mine apart last year trying to solve the problem 😤.
Will take a look at that little spring thank you.
One more thing while I remember had this mower along time service it ever year the problem only started last year .
having the same problem with same mowers but your video has helped me solve a few probs thaks mate
Thanks for the tip about the missing carb spring that no one supplies.That was the problem with mine I fitted an external spring to the linkage and attached it to one of the pull start cover fixing bolts and it's got me away .It ain't perfect but it will get me through to the end of the season
this is without doubt the most comprehensive and detailed troubleshooting guide for the Champion SV150 anywhere.
In the first few minutes i have discovered that I did not have the governor springs in the right location so it could never work properly .There is also a spring missing which I was not aware of. No wonder I could never get it to run correctly without over-revving , cutting out and hunting issues.
Thank you for sharing all your knowledge and experience so freely .
John Cooper Thanks John very kind of you to say
@John Cooper How did you fix the missing spring issue? Is there a replacement part?
@@yannisrigas4983 no unfortunately not .....the spring is not available on its own. I bought a used complete carburetor off ebay for £6 and some new gaskets and it works a treat.
thank you for getting back to me but I have give up with it , my new honda dose not cut as close as the mountfield just bought a new starter essay last week for the mount field that was a waste of cash cheers
I had one recently and it was an air leak on the inlet tube from the carb to the top of the engine. A hairline fracture in the tube itself. Not visible until i took it off. 😁👍
Mine would start and die so I just Undid the nut on the fuel bowl under the filter and and let it run for couple of seconds then it started fine after that but it does surge up and down but still can use it now for cutting the lawn. Big up from Scotland
Hello buddy, hope your well, found your channel from Martin butler channels, good work your doing.
I also restore mowers started few month back and try to buy and restore briggs and stratton and Honda engine mowers only, but today my neighbour donated a challenge xtream with sv150 engine to the war efforts, I feel your pain they are a pig to get running right aghhhhh, cleaned carb twice now, got a good spark, checked key on flywheel.......I've got it running but omg lol, give me a briggs and stratton classic engine anyway of the week, staysafe
You learn a lot doing those!
With a hunting problem on a SV150, it's either an air leak or fuel starvation. So I go through all of the advice on your video and if it still hunts, I remove the main jet and open it up very slightly with a fine drill bit to let more fuel through...that usually fixes it
Andy K Ill try that if I get another
Hello Mower Man. Shaun from Shaun's Lawns here, I know this question is nothing to do with the SV 150 but I have just purchased a 2008 Mountfield RM55 160cc Power Drive 464 PD. The question I have to ask you is that I have just serviced the mower including dismantaling the carb as the mower would not start, all complete now and the mower is running ok-ish but it tends to hunt (slightly revving up and down) Do you have any Idea what is causing it. Would be grateful for your expertise advice. By the way I really enjoy watching your vids. Look forward to hearing from you. Shaun
I have a question, hoping you could answer. Do you know what compression reading the SV150s should be between. I’ve been looking to find what they would have been when they left the manufacturer, and what range it should be in, unfortunately I can’t find any figures on these specific engines. Any help much appreciated. Thank you.
I have a mountfield lawnmower almost identical to the one you are talking about,my question is that I have a honda izzy engine that I purchased on gumtree and I wanted to know if it will fit into the chassis of the mountfield.
Hi, has there been know crank and piston rod problems ( Rod losse ) with the SV150 engines ? thank you :)
hi
i'm currently refurbishing a 1980's vintage mountfield emblem as i think it should see the rest of my life out being an alloy deck and a trusty 3hp briggs and stratton which is what drew me to it in the first place. engine is running as sweet as a nut and is now removed, i have the handles away getting powder coated and i'm in the process of stripping the deck down to clean and re-paint but i'm struggling to fathom out how to remove the front axle? are these held on by bolts which sheer off when they are tightened up (security bolts) ?
Mower Man, does the Briggs Straton 125cc engine (on a Weed Eater brand mower) have a similar spring? I have the same issue and can visibly see the brake moving back and forth as it runs.
Sound advice Paul . They can be a right pig .
Yeah they can be
Yeah i'm sick of them tbh. But if it's cheap...
@@MowerMan lol just cant say no hay. I'm thr same
The spring you mention under the black throttle lever! i have RM45 mountfeild & i think it could be the same problem ! have you had any experiance on these ? carn't increase the revs on the throttle lever linkage & springs seem okay know vid's on it anywere can you help please
Hi can you tell me how that spring should be fitted my spring was off but I don't know if it should hold the butterfly open full or closed full!! Can you help please??
Hi mate, do u have any of the bolt/ nuts that attach the handle to the deck of the mower, same as in this video, that I can buy, as I’ve lost 1 off my mower, with I successfully got running after watching ur videos, however it’s pretty useless without that nut n bolt for the handle
Thenk you. From Ukraine 👍
Thank you too!
Yeah mate they are a pickle to get running right I believe they have too much going on spring wise. They could of make it easier by having a different carb on it. I have one with a blown head so need to get that one done. Good video mate as always
Micks Mowers I agree, I honestly think they do stuff like that the deter the user from bothering to fix it or confusing them so much the just go and buy a new one.
@@jacobbates3652 yeah apart from us lol I picked up a nice little job lot today. One needed a new plug the other needed the recoil spring re fitting.
Cheers Mick ! far too complicated compared to a briggs
@@MowerMan yeah I know what your saying still it keeps our hands in for information
great video , thanks , Ive tried everything . mine starts on choke , revs then dies straight away. when I spray with carb cleaner it keeps going for while pops and burps then dies. , Had carb down three times ,air lined clean as whistle ,changed o ring on inlet manifold ( should this have gasket as well?) , re sealed head gasket ,good plug , check coil lead , cut out switch, clicking and multi meter checked, from what I can see wood rough key looks ok, mind you could not take flay wheel off to see . crank doesn't have a viable key-way. arhhhh dont want to give up !!
does the choke open and close properly? It will run longer and pop with car spray till it burns it. Make sure the needle is moving freely in the carb also. I feel your pain my friend.
@@MowerMan Hi , thanks, yes the choke opens, closes fine. needle is free and clean. I dont think its a air leak but as Steve says ill check the inlet tube. My immediate thoughts were blocked main jet and float level. But its plastic float and needle and seat is fine. Do you think it would it fire up then die immediately if the coil was duff? and im not sure about the key way i pulled the nut and the ring off but cant see as it obscured, its wood rough key and not a spline keayway on mine.
Hi mower man , hooray I fixed it, tuned out to be after going though nearly all of the fixes you suggested in your vids the choke cable adjustment. I didn't check the adjustment just thought if the butterfly opens and closed that would be fine. What a plonker i am!! always looking for the most complicated fist. Thanks for all you help and videos. I have learnt loads the hard way !!!
Hi, dont know if you still respond to these videos....do you have an ideas for a sv150 engine on a sovreign lawnmower. Except it has NO throttle controll at all, and the choke is like a red ball you squeeze 3 times. When i start it, the engine is just RACING at full speed. Ive tried adjusting the idle screw and the tension on the main spring but it makes no difference, thanks
have you had any dealings with mountfield RM45 140CC ? Do you know were I could find the valve guide settings searched high & low found one site says 10-15 intake & 15-20 for exhaust ! that seems a bit heavy to me have you any ideas please ? thanks great vids
I'm not sure unfortunately. You could send them an email
is there a deck from any other model that the Champion SV150 can be made to fit if the existing deck is rusted out ?
John Cooper Yes john as long as it's the right width and the crankshaft is the correct length
I got this mower and wgen adjusting from the rabbit shall we say to the tourtoise on the revs it cust out sometimes going down or going back up any ideas?
So when it goes from choke i push down then it cuts out if that makes sence
Is it just me or is the block on these engines almost if not entirely the same as the briggs and Stratton 35 classic and sprint 3.75 series? Same manifold, same threaded breather tube sam flat head design and bolt spacing even the same way of fixing the carburettor control assembly to the front of the engine (3 head bolts across the top) i wonder if the carb and hardware from a briggs and Stratton 35 classic would work on one of these?
yes they work
just put my mountfield in my van ready for when the tip opens [ have a spark on the plug and fuel getting to it but it just will not start ???
If you are feeling lucky you could check the crankshaft keyways in case the timing is out
Hi I know this is a old one but I’m struggling with my rv150 I have recently swapped the ignition coil and it works fine until I connect the kill switch and then it won’t fire up just wondering if you might point me in the right direction thanks in advance
alan stirrup Check the microswitch is activating
@@MowerMan hi thanks for your response I really appreciate it the micro switch is making a clicking noise when pulling the switch could it still be faulty as I say it fires up without it connected once connected it will not fit up
Hi mower man Micks mowers shout your I came to see what channel all adout like what
hi doug mower man has a good channel to me ages to watch all hes videos
Hi. Do you have any videos on the raser Sv40?
Thanks
Dont think so sorry
@@MowerMan no bother. Loving the videos.
Who makes those engines?
What price did you get for the izy Paul?
Lee westwood £90 Lee. I sold it to a lady who wanted something easy to pull over to cut the grass round her stables!
@@MowerMan I've just picked one up similar condition wasn't sure how much to list it for.
Hold the camera still.
Say cheese
its a chinese copy of the classic 35 but with a float carb and seperate tank. and its a bad bad copy. :-( bad bad engine. 95% of the problems with the sv/rv150 are to do with the carburettor. on some there is a brass jet on the top of the carb opposite the throttle. the jet had been crushed from being overtightned and it never ran good until i replaced that jet. Another thing the ht lead from the coil feels loose at the coil. another bad design. Some variants have a catylytic converter on the exhaust. You can convert them to a paper air filter like the quantum (briggs)
Absolute garbage engines.
The carb set up is a complete balls
Crap mowers