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1970 Sears 12 hp

8K views 40 replies 6 participants last post by  z445guy  
#1 ·
Just picked up a new project to work on. Even though I already have too many. A 1970 Sears 12 hp with a different hood on it, have another hood with the side pieces, but it's pretty rusty. Thinking about cleaning it up and clear coating it to keep the patina, and I think I'll rip the fabric off the rear seat, and just have bare metal. Let me know what ya'll think.
 

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#5 ·
The carb on this mower leaks, I think it's the seal around the bowl, but I don't know if I want to dig in and check it out, I don't want to screw it up worse than it is. Also, it runs a little rough at higher rpms and I was wondering if anyone could tell me how to adjust the carb and all and get her running perfect.
 
#7 ·
New air filter, new spark plug, new oil, fresh non-ethanol fuel, new fuel filter, tried a fuel system cleaner recommended by someone who deals with these a good bit, everything moves freely and works properly, and it's still a little rough.
 
#11 ·
There should be a high-speed adjustment screw , on the bottom of the float bowl,or,on some carbs there will be two screws on the top,or side.
Hard to say ,without seeing the carb.
If there's one on the bottom of the bowl,start the engine,and let it warm up,then put the throttle in the "fast" position,and slowly turn it in,until it smooths out.
Then, turn it in,a bit more,until it stumbles.STOP,and turn it out,until it just smooths out.
This should be the right setting.
 
#14 ·
Well I had a lot of tree work to do today, so I took out the suburban to move my trailer around to put the Tree limbs in. It ran like complete garbage. Surging up and down, stalling, sometimes it would run without choke on sometimes it wouldn't. It would surge down then puff out black smoke and rev back up.
 
#16 ·
Have you given it a thorough carb cleaning yet? sounds like a jet or needle could be partially blocked or the float hinge could be dirty and sticking. let me know if it helps out.

I've thought about it, but I would like to find a gasket kit before I remove the carb, or maybe even a rebuild kit. I really just need to sit down on the computer and try to find all this stuff, but I got distracted by my new toy, and all the stuff I need to get done.
 
#17 ·
Gasket kit

If you know what engine it is and/or what carb is it, I can try and find a carb kit to match it. The carb will probably be very simple to take off, clean out and replace parts on. My Sears ST16 has a tecumseh oh-160 that I just cleaned the carb on, and it took me about 45 mins total, including removing and reinstalling it on the engine. kit was only 10 bucks, so no big deal, really. Parts for these old suburbans can add up quick, though! Try to repair before replacing.
 
#23 ·
Thats a nice machine. No, my nose cone is (sadly) busted to hell. The PO "fixed" it with some 1' angle iron, which is stronger but looks like absolute crap. The Sears are some great machines, they definitely dont make them like they used to. Here's a couple better pics of mine. my computer likes to flip pics around if I don't crop them square:confused: not sure why...
 

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#24 ·
Well I took the carb apart and tried cleaning as best I know how, still runs like crap, but I was busy doing tree work so I didn't have much time to mess with it. Other news I ordered the final parts (well hopefully the final parts) for my bike project, hopefully they'll come soon and I'll be riding around.
 
#25 ·
Well I haven't gotten anything done on the suburban because I just don't know what to do. I've ran out of ideas, also the bike is behind it in the garage anyway so it pull it out and work on it is hard. Got the bike back together after waiting on parts and such. Fired on the 3rd kick but couldn't run it long because it was late by then. Maybe I'll try looking at the suburban again but I just don't know what it could be