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 2 stroke mower

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darkside0914
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PostSubject: 2 stroke mower   2 stroke mower Icon_minitimeAugust 22nd 2019, 2:24 am

i have this little john deere 82 rer i've been sitting on for a long time, and i've been thinking of all different ways to build it, , 1 st with just one of the 11 or 12hp flatties i have laying around, then i thought of putting a go cart axle under it and using a pred212 and torque converter, but then i thought i want something different, something unique, and thought of a 2 stroke from a lawnboy push mower, i know they had 6 1/2 hp motors on some of the later models, finding one on the other hand might be a different matter, but my question is this, will the peerless 700 in the jd handle the rpm of a 2 stroke, and just how feasible is it to use one on a street mower?
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mr.modified
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 22nd 2019, 12:28 pm

I had a junk snapper I used for parts that had an old single cylinder 2 stroke on it off an old snowmobile. As far as a lawn boy engine, I would think you'd be fine with the trans holding up. My guess would be you'd want a bit more power than that. The old snowmobile engines sometimes just have a 1" keyed shaft, nothing too special. And they don't run at crazy high rpm like the modern engines do. Rotax, JLO, Sachs, and others made single cylinder 2 strokes from around 250cc to 320cc and maybe sometimes a bit more. 10hp-16ish depending on the size, so they won't hurt a lawn mower transaxle. Plus you can run them at any angle you want as long as the carb is set up the right way.

The original Rotax singles that Ski doo used for their snowmobiles were originally designed to be used in industrial applications. I guess running pumps or generators ect. Later they had purpose built engines.
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darkside0914
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 22nd 2019, 1:52 pm

i've seen a few on you tube running 2 stroke push mower engines, but not many, there is one running a 4hp briggs 2 stroke on an old craftsman and it pulls really good with plenty of power from what the owner said in the video and my jd82 is a lot lighter than the front engine craftsman he used, of course all this is just a thought, i'd have to find the engine 1st
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mr.modified
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 23rd 2019, 9:04 am

You'll be fine with the transmission for sure with anything 10hp or less. A lot of people have 20hp V twins that get abused pretty heavily off road and they hold up pretty good. At least, a lot better than you'd expect for a lawn tractor transaxle.
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darkside0914
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 23rd 2019, 7:40 pm

i was more concerned about the rpms or do the 2 strokes used on push mowers not produce high rpms like other 2 strokes on motorcycles and such, if the 2 stroke is going to be hard to find or to expensive i'll just go with one of the 11 or 12 hp engines i have laying around and do a pulley swap instead
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mr.modified
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 23rd 2019, 11:13 pm

I don't think the mower 2 strokes run too much higher rpm than any other 4 stroke engine. Might be able to look up specs for certain engines online and see what they're rated at but I think that would be ok. Lawn boy made a lot of the 2 stroke push mower engines I think, they should be around. They may not be quite as torquey as a 4 stroke with the same hp.
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 23rd 2019, 11:34 pm

I know @RockeyDA has a pretty sweet LawnBoy with a 2 stroke on it. He might have some info.
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RockeyDA
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 24th 2019, 12:19 am

i have not put a tach on my lawn boy, but i would imagen the gov is making the blade spin at same speed for safety reasons. if i had a working tach i would see how high it reves wide throttle.

i belive the point of lawn boy using 2 stroke was being able to get a motor that has more power in a smaller, lighter, cheaper to make package.

i both need a blade for my lawn boy (witch is a size they dont sell at TSC) and the nut to hold the blade on (witch is a thread they dont sell at TSC)
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mr.modified
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 24th 2019, 12:37 am

They are nice and light. I picked one out of a free pile on the road once and got it running a bit. It worked ok. Thing was pretty worn out though. Didn't run so great. Took it apart to see what was wrong and one of the main bearings was chewed up and the exhaust port was around 85% blocked with carbon.
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darkside0914
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 25th 2019, 4:53 am

they're hard to find around here in any condition, so this may just be one of those things for the wish list, to bad i don't have access to the mowers i did 20 yrs ago, a family friend had at least 10 running lawnboy mowers and a bunch of different riders, but he passed away about 10 yrs ago and his stash was sold for scrap by his kids
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RockeyDA
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 26th 2019, 8:11 am

really? lawn boys are easy to find here. i could get one, maby even 5 today if i set out to. who knows if they run and what needs done, but finding them here is easy peasy.
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mr.modified
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeAugust 26th 2019, 9:35 am

You could try an add on craigslist or something.
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darkside0914
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeSeptember 3rd 2019, 2:53 am

i think i've actually found one, the same guy my brother got the jd216 from has a lawnboy,i'm going to talk to him tomorrow, see if it's worth getting, find out what kind of shape the engines in and if it runs, if it does or at least if i can get it running easily i'll make him an offer, i've also been thinking about which machine to put it on if i get it, i have my little jd82, but i also have the baby toro 550 which came with a 5hp engine factory, so the lawnboy engine might be a better fit for it than the 82, i'll decide if i get the engine and get it running
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeSeptember 3rd 2019, 7:24 pm

Maybe a horizontal 2 stroke from a snowblower, the push behind kind. They are around 3.5 to 5 hp. with a 5/8 to a 7/8 inch output shaft. Be good to setup the driveline like a go cart. With some strong springs for the clutch
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RockeyDA
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeSeptember 10th 2019, 7:28 am

if you are able to get to center county, i got a lawn boy with no balde i could give you. she runs. i just cant find a nut to thread on shaft or a blade that fits.
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darkside0914
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PostSubject: Re: 2 stroke mower   2 stroke mower Icon_minitimeSeptember 11th 2019, 1:47 am

thanks for the offer, but you're a little far away, @RockeyDA the one i'm looking at supposedly runs, it ran when i put it out there, he said, he hasn't gotten back to me about weather he'll take my offer or not, if not no big deal, i'll forget the 2 stroke and put a new carb on the 6hp briggs i have sitting in the garage and put that on the toro and a 12 hp briggs off my old murray can go on the john deere 82, niether one is priority right now as i'm trying to do some work on my suburban so i can sell it
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