How to fix and tune Mantis Tiller carb or engine that stalls using throttle - easy fix
Вставка
- Опубліковано 6 тра 2014
- 2 Stroke Mantis tiller that bogs down or stalls when using the throttle - try watching this video - I managed to fix mine - hopefully this will help you.
- Навчання та стиль
I've had this about four months and have found it to be an aggressive and powerful rig. ua-cam.com/users/postUgkxjo0FLo5z3Y_qUcT3vSlOqpMaMdFjvsXa I've used several others in the past and the Sun Joe surpasses these, easily. I note that several people have commented that it bounces on rocky and compacted soil. I believe that would be the case with all tillers - the ground does need to be "broken", either with a larger tractor type unit or with a shovel, and rocks need to be removed. I'm living on a Pike silt loam here in the midwest and the Sun Joe turns my garden to bug dust in two quick passes. I use a technique where I do a short 2 foot run then pull it back and let it go over it again.
Thank you for the info. Just brought my old mantis back to life after YEARS!!
What an excellent video! I've watched quite a few videos on adjustments to the Mantis carburetor, but this is the most clear and helpful. Thank you.
Thanks for the video. Mine was dying when tried to throttle it up and your method fixed it. Running great now!
The absolute best video on tuning a Mantis. I rebuilt a carb a few years ago and this video was very useful. I recently replaced the carb and once again the video was priceless when getting the Mantis ready to till when there isn't any settings to work with.
This man deserves a Pulitzer! Thank you! This is the only video that gave me enough information to get my Mantis carburetor running as smooth as possible.
Same here, just got mine back up and running. Kudos to Dan, for making this video!!
Thank you for making the best video I've seen on UA-cam about how to adjust the Mantis tiller.
Top job mate. Many thanks. Ive just come in from a marathon mantis session. Took me 90 mins to get the bugger started. Then, followed by a 2 hour long carb trial and error session that resulted in huge amount of expletives issued - much to the neighbours disgust - and a big lump taken out of my middle finger from starting it god knows how many times. Watched this. Sorted in 30 mins. Ta very much.....
That's amazing, shame you wasted all that time trying to get it going. Thanks for the feedback 😊
Excellent video just what I needed as I`m trying to get a non running one working again for gramps. Brilliant carb tutorial
Excellent instructions. Mantis should provide a link to this video on their web site.
My little Mantis is going on near 30 years old. It has been a real work horse, well work pony I guess, and has rarely failed me until this week.
It wouldn’t start. After watching your video several times I grabbed a screwdriver and within a few minutes my tiller was working like it was new again. My carb adjustment screws do not have the limiter caps you mentioned (added to newer models?), just tension springs, and were way out of adjustment. It took several full turns to get them both seated. No wonder it was getting ornery.
My wife thanks you. My dog thanks you. And I thank you.
Thanks so much for this video. I was really getting frustrated, couldnt get my Mantis to run. I bought a new carb and still would not run right, bogging and shutting down when i gave it gas, almost gave up and had decided to buy a new one. I gave it one more try and made the adjustments in your video, runs like a champ! Thanks again.
Fixed my problem!!! Thanks for the video.
Had the same problem with my Mantis. Removed the adjustment limiter caps and followed the same procedure as you showed. Now idles and powers up perfectly...no stalling or bog! Thanks so much for this clear, simple method to adjust the carb properly.
Ron G.
Cheers for this video, Had mine serviced and after an hour or so it would bog down, this video has helped me re-adjust the carb
aztecbikes brilliant - glad it helped!
I watched this video about 8 years ago and had to review it again. I couldnt get much of any thing more than an idle that would die after 20 seconds. You cover the Hi & low settings very well and as a result my former raspberry patch is tilled . Thank you for this great video !
Super - still really pleased that this video is still helping people, when I made it there was nothing anywhere so rather than just chuck it out I made a goal to work it out and help others! Have a good day
Great info! Tiller now works like a charm!!😃
Perfect instructions. Got my non running mantis back in perfect working order. Thx!!
I too think this is a no nonsense very good video. I have been having problems with my tiller for years and this video showed me how to fix the problem. Thank You very much for taking the time to make this video. I only wish I had found it years ago as that would have save me a lot of aggravation. Again Thank You.
Helped me fix my company directors tiller. Thanks man
Thanks brother. Replaces the fuel lines and spark on mine today. Replaced the gear grease. It's still bogging down and idling fast so your video gives me confidence to make the final tuning adjustments. It's 17 yrs old! Great machine worth taking a few minutes to learn how to make the fine adjustments
thanks very much! so pleased it helped...I couldn't find any info on this machine/subject and was about to scrap the machine...
Thanks! My Mantis is now running great!
I purcahsed a 2010 mantis the other day as spares as it wouldnt run for longer than 1 min. Watched this video and had it running sweet as a nut within 2 minutes. Fantastic cheers. Just hope we get a decent summer this year down in derbyshire!
liamsdld That's excellent mate. Glad it helped. I couldn't find anything anywhere and mine had me pulling my hair out for weeks on end!
Thanks. This just sorted my Mantis Tiller out. Cheers!
MrPagsey glad it helped! 😀
Mine too. Tried other remedies that didn't work for the last several days. Every time I increased the throttle the tiller died.Watched this video and now back good as new in 15 minutes.Many thanks from Ohio gardener.
Great video. Really helped me sort mine out.
Thanks. This fixed the problem for me. Runs great now.
great to hear! thanks
Thank you so much! She’s purring again!!
Great video. Thanks a bunch for taking your time, helped me get the old girl working!
I'm pleased...can't believe it's helped so many people!
Great video. Solved my exact same problem. Many thanks.
great stuff!
VERY CLEAR AND GOOD INFORMATION THANK YOU
Thanks that saved alot of time, plus the white adjustment was just spinning on adjustment screw....cheers
Helped me out a lot, thanks
Matt Hughes thanks for saying so!
Thanks a lot for video , basically in my case i just needed to cut those stopers because I needed like full turn on H clockwise and full turn L counter clockwise and tiller work
like brand new , thanks a lot
Citus LawnCare brilliant. glad the video helped
Thank you so much for this excellent advice! I needed to till my potato land, but the Mantis engine just kept on choking when using the carburettor. The best advice was to remove the plastic hubs from the High and Low screws so that they could actually be turned properly. So, after a little adjustments I got my over 10 years old tiller working again like a dream and the whole big area is now ready for my potatoes. You are my hero, Danbdrums! Why doesn't Mantis manual tell the same thing? When they are on, it is impossible to turn the screws according to the instructions.
an4ipa that’s great news! I was about to throw mine away and even the mechanic over the road didn’t have a clue, I then sat and thought about it logically and got it working then discovered lots of the same questions but no answers! thanks for leaving a nice comment. Best wishes
Hi, an4ipa-
How did you get the plastic covers off? I have been afraid to take mine off.
Thanks for any suggestions you may have.
Opening choke after first firing was probably the most helpful advise. Tuning the jets seems very sensitive but I finally got the engine running well. I almost gave up untill this video encouraged me. I suggest using fresh fuel. Use Gasoline without corn alcohol if at all possible. You can buy premix chainsaw gas at Home Depot etc or go to local airport and buy aviation gas and mix your own. AV gas is noticeable difference in starting and running. AV gas works well in your boat motor too.
Mike Rolph glad it helped Mike! good advice on the fuel. I haven't had any issues using old fuel but understand it is meant to make a difference
Thanks for pointing out the bit about pushing the choke straight in after the first pull of the chord, that's where I was clearly going wrong, started almost straight away!
excellent. glad there's some useful info in there besides tuning it!
OK. After seeing this, and many others, I finally found a chat elsewhere that would have saved me hours of messing around with the carb adjustments. First - very important to not run 2-cycle motors lean (not enough fuel in air) as it can burn the pistons and kill your motor. So, for $12 I got a new carb, fuel lines, air filter, gaskets, etc. all in a kit and next day to my door (yes, $12). Then, took the exhaust apart and sprayed carb cleaner in the exhaust filter assembly to clean. Now- for adjusting the carb: turn the Low and High adj screws all the way in (not too tight, you'll ruin - just til stop) then, back out the L screw 2-1/2 full turns and the H screw 3 full turns; It should now start but run rich; so adj the H screw in (less fuel to air) small turns at a time until it runs fairly well; then idle the engine and adjust the L screw in until idle sounds better; then adjust the Throttle to idle smoother; then adjust the H screw so the throttle will rev quickly and to a nice high rpm; then adjust the L screw to as nice an idle as possible; then adjust the throttle adj to best idle; Good info was that the L is the fuel to air at idle , while the H is fuel to air under power; Happy tilling;
I followed your instructions to the letter and mine still starts and runs for about 15 seconds and shuts down. New carb, fuel lines, air filter and cleaned the spark arrestor screen. No luck.
Thank you!
Thanks this video should help me get mine up and running.
Cool Darrell, I had a nightmare when I first got mine, after a solid week of trying it would not start, then when it did start it wouldn't run when applying the throttle..this is step by step how I got it to work. If you're having problems...get back in touch! :)
Gave it another Go and cant even get it to Idle.
I'm going to buy a carburetor rebuild kit as the plastic diaphragm is warped and it was not winterized.
When adjusting the carb the H screw is closed and the L screw is being slowly adjusted from the closed position, Correct?
Woo! Got it working.
Darrell Hass good stuff!! well done mate!
Mine too 😮
Those plastic limiting covers on the carb adjustment screws are the pits. Keeps you from doing what you need to do. The good part is, once you get over your fear and grab them with pliers and pull, they come right off the splines of the real adjustment screws and THEN you can get to work. Thanks for the clear instruction on your video, I watched it a few times, got mine running and now I get calls from people wanting me to work on theirs. It's so common of an issue, a guy could almost make a living out of fixing them in the springtime.
Thanks Mate !
I want to take my Mantis tiller to the next Olympics, replace the hammer throw with a Mantis throw
Thank you!!
My mantis got out of adjustment as the carb came lose the adjust must have changed. So tomorrow I will follow your method to see if it works for me.
I think I nailed the H (high) adjustment...real smooth between idle and pedal to the medal. But the idle is sketchy. Not sure what to adjust. Sounds like it could stall sometimes....yet the axle turns all the time as if the idle is too high but it sure doesn't sound too high. No idea whether to tweek the L (low) adjustment (and which direction??) or the idle screw. Sometimes the idle will also rev a little on its own.
genius!! mine was low 1/2 a turn out, hi one turn out, many thanks
Mick Radford that's brilliant! glad my video helped
What does that mean. Did you turn the H and L all the way in and L half turn out H one turn out or start where yours was set?
Awe ones video, some of us slow readers needs a little bit more then 3 seconds to read your instructions though. Thank you though, this helped. Keep me coming.
Try resetting video playback speed to .75 or to .50.
This video is helpful, but my mantis might be one of the originals model 7225-15-02. Anyway as far screw adjust both high and low would only move 1/2 -2/3 of a turn would never move a full. So considering the plug was black changed it and the air filter and with new gas mix I adjusted the carb as best I could and ran good, but the throttle seemed to stick on fast I had to manually push the throttle lever to slow, but I can work with that.
Hello. Yeah, have you removed the little plastic clips that sit on the screws? Also. If you notice there are no blades or tines etc on the tiller so when opening the throttle to full there is nothing to go forwards
Thanks for posting the video, but I have some questions about it all. I have an older Mantis tiller and no real experience in carburetor adjustment. I have taken off the red and white plastic screw covers. Now, where should the high and low screws be to start with? Did you say the red (high) adjustment should be turned all the way in (clockwise) and then turned back (counter-clockwise) 1 rotation? What about the white (low) adjustment, where should it be to start with? Turned all the way in? Should it be turned back? And the idle--where should it be to start with?
Thanks for any info.
did you get sorted? just seen this comment! sorry
i can't get mine to idle or stay running. you talk in the beginning about a long adjustment screw. is that the screw with the spring
how are you getting your mantis to stay in one spot when you rev the throttle ,mine will move forward if I hit throttle.
yes350yes I took the tines/blades off, the axle spins when using the throttle but there is no tines to move it forwards
So are both screw jets completely tightened before starting? I just rebuilt my carb and need to know
yes. correct
Mine stalls after running on idle for like 30 seconds.
How do i know if i have the lower screw in correct position? I put a new carburetor on last year. When i tried to use it, it cut out a lot. I dont remember if i used both screws to get it tuned in, or just the bottom one. Anyway, i dont know where its at, compared to where it was out of the box.
The lower screw is your idle speed adjustment. It adjusts where the throttle cable stops. You should tune the low circuit flathead screw to best runnibg and then the Phillips head one in or out so it idles nicely but doest turn the tines
What’s is the high and low for and what is the correct adjustment for both? There’s another Philip head screw below it,what is that adjustment for?
The big Phillips head one is your idle speed adjustment. The two others are high and low rpm fuel circuits. Low is mostly at idle and high is more when you are full throttle
I got my tiller used. Limiter caps already removed.
Which screw is which, is the high jet on the left closest to the choke? It is hard to see which you are adjusting.
as it says in video...low adjustment is the screw on the right...high is on the left. hope that helps
If these were all the same, I found photos in which there was a sticker on the cover; high should be on the left!
And hah 4th time listening I notice you mention the low is on the right at the beginning of the vid. Thanks!
I have adjusted as you suggest high and low but I think maybe my throttle screw is also out of whack and I dont know where it should be set. I have new carb and plug and when it does start only a few seconds then wont start again.
Getting closer to where it will alt least run for a few seconds where before it would not even start. It may not help but I drained all the old gas from last year and put in new and see what happens.
I finally got mine adjusted out to where it ran fine but it wasnt the same as shown in this video, way different.
Been given one of these and i shall try your method to get it running.Failing that i will get a carb from China.
Just fitted new carb from China works fine under £10 on ebay came with fuel line and filter and spark plug . Mantis wanted £70 just for the carb.
Running much better now after following this video
Just can't gut the axle to not turn when idling, when I turn the idle screw to slow the axle the engine will cut out before the axle stops. Any ideas?
hi Barry.
if the tines are attached and they spin it might need tiny adjustments...
if the tines are not attached and it spins...Sometimes this is normal (unless they spin quickly)
when cars are lifted on special ramps and idling in neutral the front wheels sometimes spin....I believe it's the clutch...
Mine cranks on the first pull and runs fine for a piriod of time, then it starts shutting down. I can crank it but it won't stay running. I can let it cool down for 20 minutes or so, and it will run fine but it starts shutting down again. It's obviously a feel issue but I can't dmfigure it out. It has a new fuel filter, new spark plug, new fuel lines, and new carburetor.
Mine stays on full when i use full throttle and i have to cut out with the switch. Assuming its the throttle cable getting stuck but anyone have any ideas what i could do?
can you please tell me why my mantis tiller is blowing out black oily looking stuff from the exhaust side ? and how do I fix it ?
amber...have you tried spraying carb cleaner into the carbs? using fresh fuel? 2 strokes are dirtier in general than 4 strokes so some more black oily liquid I think is to be expected
+danbdrums Thanks for a reply. no I haven"t tried that. I'll let you know how it works out.
+Amber Harmon where exactly am I supposed to spray the cleaner?
What did you adjust the low side to?
?
I seen it the second time I watched the video. To your question there's a low and high side adjustment screw to the carburetor. but I got it now
I seen it the second time I watched the video. To your question there's a low and high side adjustment screw to the carburetor. but I got it now
+Scott Ickes ah good. all the information is in the video mate. good luck
My mantis wasn't working and then I changed the carb and it started up. After I used it a few more times it just stopped again out of nowhere. Now I'm stuck once again smh
Can not get the fly wheel to engage
If everyone has probkems with Mantis tillers, just maybe it's a Mantis issue.
Let the script narrative run a bit longer IMHO
I contemplated that but then thought people can just pause to read the text...
I am sorry it is just me. I do not understand what you are saying and can see nothing but your gloves. No offense meant.
No problem, nobody else seems to have the same issue!
Cant hear or understand him and his hand is always in the way and no one knows which screw hes talking about!!