UPDATE on repair of Craftsman Lawn Tractor

I bought a 10 HP Craftsman lawn tractor in a non working condition for
$50.
It turned out that it had a stuck AND gas logged float. I went to a
Sears repair center today and got a new float. Also bought a gas valve
to be able to stop the flow of gas. Installed it and the engine is now
running fine. The tractor drives forward and backward and also cuts
grass. My son was very excited.
The only problem (besides a shot battery) is that the engine is
running unevenly. It revs higher and slower at the period of perhaps 2
seconds (WAG, not measured).
I suppose that something is out of adjustment (duh). I did mess with
set screws a little yesterday, without much understanding, and _think_
that I returned them to previous positions. Not sure where to start.
i
Reply to
Ignoramus19325
Loading thread data ...
I had a similar on my MTD and it cleared up when I cleaned the air filter and toped-off the oil. Might check the vanes on the governor.
Reply to
Tom Gardner
clean the air filter and adjust the needle valve (in that order). cs
Reply to
Chuck Sherwood
Oops, I forgot to check the oil today... Will check both oil and air filter tomorrow. The air filter is not so bad, but I will clean it anyway. Thank you.
i
Reply to
Ignoramus19325
Where is that needle valve and how to adjust it. I can post very detailed pictures if necessary. Needle valve sounds like it could be of great relevance to my story. Thank you.
i
Reply to
Ignoramus19325
I had a pressure washer doing that. I cleaned out the gas tank and carb, both were on the dirty side having various amounts of crude, gunk and what-ever. It's a family tool that gets passed around and abused.
Lane
Reply to
JustMe-Lane
"Ignoramus19325" wrote in message news:RHdLe.13447$ snipped-for-privacy@fe31.usenetserver.com...
perhaps 2
It will be on the carb body. Looks like a screw and will have a spring under the head....
Reply to
Rick
Thanks, perhaps I will take it off and wash it... How much time might that take?
i
Reply to
Ignoramus19325
Thanks... I will try messing with it tomorrow...
i
Reply to
Ignoramus19325
Fuel filter clogged ?
Maybe slow flow - fills the float and then you run it out - starves and ...
Martin
Reply to
Martin H. Eastburn
Thanks Martin. I will add fiel filter to the list of things to check. There could be dirt in the carb too, it was all cruddy.
i
Reply to
Ignoramus19325
You DID buy a repair manual for that beast while you were at Searz, didn't you, Iggy? Get that and you'll know how to rebuild and adjust the carb, clean the governor, set the belt tension, adjust the gidge-gadgets (as my female neighbor calls machines/tools/mechanical things) etc. Even at Searz prices, they're worth it.
- Inside every older person is a younger person wondering WTF happened. ---
formatting link
Website Application Programming
Reply to
Larry Jaques
It's likely that the problem is the idle mixture adjustment. The problem is that until I see a picture of the carb I don't know which one you've got.
Most likely there's not a main mixture adjustment on the carb. They quit putting them on there a long time ago to comply with emissions laws (which is crazy to me). It might not even have a idle adjustment. There's getting to be more of them out there that can't be adjusted at all.
Anyway if there's a screw with a spring under the head on the side or top of the carb somewhere that's going to be the idle adjustment. If there's a screw with a spring on the nut which held the float bowl on then that will be the main adjustment.
To adjust first run the engine at a high rpm and get the main adjustment set (if it has one) to where it runs the best. Then slowly idle it down as low as can without it dying. Then slowly turn the idle mixture. If it starts slowing down more then go the other way (preferably reverse it fast enough that the engine doesn't die). You adjust that screw till the engine runs the best it can at idle. You'll likely have to make several attempts at it slowing the engine down more each time till actually does idle properly.
If adjusting the screw doesn't do anything then the idle circuit in the carb is stopped up and will have to be cleaned out.
Wayne Cook Shamrock, TX
formatting link
Reply to
Wayne Cook
Sounds more like the governor spring got stretched or the linkage is out of adjustment.
Reply to
nospam.clare.nce
I feel quite stupid that I did not do that. As a computer programmer, I am too impatient to read manuals, but I can if I force myself to.
i
Reply to
Ignoramus29516
thanks... I will check it out..
i
Reply to
Ignoramus29516
Wayne, I saved your post... will follow it tomorrow... thanks...
By the way, my bowl does not have an adjustable screw holding it. There are two adjustable screws, on the carb.
i
Reply to
Ignoramus29516
We're manly men and we don't NEED no stinking manuals!!!
Reply to
Tom Gardner
Oh yeah I forgot about the idle speed screw. It will be the one near the throttle shaft. The other in this case will be the idle mixture adjustment.
If it's placed near the intake flange of the carb it'll be a idle air adjustment but it still adjusts the idle mixture.
Wayne Cook Shamrock, TX
formatting link
Reply to
Wayne Cook

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.