Fired it up last night to deal with the dump we got, and it was spitting flames and backfiring out the muffler...there's not a lot to adjust in terms of air/gas mix on the carb....any suggestions what might be causing it to run so rough?
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Snowblower in rough shape
- Thread starter shepherd
- Start date
never enuf time
Well-known member
how old is the gas ?
aaronrkelly
Well-known member
Timing....weak spark...what type of snowblower?
ex-x-fire
Well-known member
Running lean will cause it to pop. Could be a dirty carb.
justme-
Well-known member
Agreed- take apart and clean that carb really well, then when you think it's cleaned enough do it again. Popping through the carb is 90+% carb issues. The engine has got to be hella old or very very abused/neglected to get pitted valve seats. Tecumsehs are not known for valve guides moving like B&S was either. note - 90% of all snowblower engines are tecumseh until about 5 years ago when they stopped producing engines.
Thanks guys...went through the carb pretty thoroughly last spring, the blower came from one of my mom's neighbours so I cant speak to the care it received in the past...the idea of timing sound interesting, as it seems to be missing a beat, surging, etc...
Is it hard to start as well? that would also point to valves, but do the carb first and see if it helps. could also be tons of carbon in the head/cyl area...
not sure about timing, if the key shears, it usually won't start and kick back at you, it's not like the cam gear can jump off the crank like a chain in a car...
if you're sure the carburetion is right on, and ignition good, pull off the head and take a look. you'll spot a burned valve pretty easily. if you don't have the tools to do a valve job, you can order a new valve and hand lap them in and do a pretty good job. you may have to get creative with a home made fixture to file the stem for clearance but it has been done many times by guys with primitive tools.
not sure about timing, if the key shears, it usually won't start and kick back at you, it's not like the cam gear can jump off the crank like a chain in a car...
if you're sure the carburetion is right on, and ignition good, pull off the head and take a look. you'll spot a burned valve pretty easily. if you don't have the tools to do a valve job, you can order a new valve and hand lap them in and do a pretty good job. you may have to get creative with a home made fixture to file the stem for clearance but it has been done many times by guys with primitive tools.
theoldwizard1
Well-known member
Spitting flames ? Sunk float.
justme-
Well-known member
going through the carb last spring means nothing now - gas can go bad in weeks. Gas turns to varnish when left for long periods of time, but before that can happen the ethanol blended in causes all manor of grief. It absorbs moisture from the air even when stored under the best conditions and separates out. Both the ethanol and the water it carries corrodes the heck out of the internals of the carb. Surging is also a 99% carb caused issue - main jet dirty.
Pull the carb and clean it. Fixing these things is what I do for a living now and has been a hobby for over 20 years. the simplest answer is usually the correct one. Any pro you brought it to would start with the carb.
Just had a landscaper stop in our shop this morning looking for one of the mechanics to make an adjustment on his sander engine. Said it was doing almost exactly what you describe, except the flame spitting caught then engine on fire...opening the cover was quite a sight. Engine started and ran but is almost totally destroyed - everything plastic/rubber melted.
Pull the carb and clean it. Fixing these things is what I do for a living now and has been a hobby for over 20 years. the simplest answer is usually the correct one. Any pro you brought it to would start with the carb.
Just had a landscaper stop in our shop this morning looking for one of the mechanics to make an adjustment on his sander engine. Said it was doing almost exactly what you describe, except the flame spitting caught then engine on fire...opening the cover was quite a sight. Engine started and ran but is almost totally destroyed - everything plastic/rubber melted.
kctyphoon
Banned
might be a combo of some old gas and needing some cleaning and adjusting.. my first question is - who makes it, how many hp or what size engine does it have, and is it a name brand engine or a chinese knock off?
there should be adjustment for the air/fuel mix - and depending what its worth to you - if its its a cheap knock off engine, you can probably buy a rebuild kit, or a complete carb for a reasonable amount of money and avoid having to mess around with anything..
i just spent a few hours going through my old yamaha and finally figured out how to fix it from being so hard to shift into different gears, and no even go into some others.. did this since i bought it 2 years ago - and i finally figured out what it was.. so happy..
there should be adjustment for the air/fuel mix - and depending what its worth to you - if its its a cheap knock off engine, you can probably buy a rebuild kit, or a complete carb for a reasonable amount of money and avoid having to mess around with anything..
i just spent a few hours going through my old yamaha and finally figured out how to fix it from being so hard to shift into different gears, and no even go into some others.. did this since i bought it 2 years ago - and i finally figured out what it was.. so happy..