It's probably one of two things:
1) Gas isn't getting to the cylinder
2) There's no spark.
Try this, get a spark plug wrench (or socket) and pull the plug. Is it wet?
Does it smell like gas? If so, then you're getting fuel. Next, with the
plug out of the engine, but still connected to the spark plug wire, ground
the metal at the end of the plug (the part that 'curls' around the end)
against the engine. Don't hold it, or you might get a jolt. Just find a
way to prop it up so that it's grounded against the engine. Then, gently
pull the cord on the engine. Is the plug sparking?
If the plug came out dry, then you probably have a clog somewhere in the
fuel line. Make sure that the petcock is open for the gas. You'll probably
have to pull the lines and make sure that they're clean. It might be junk
in the float bowl of the carburator. Carbs can be fussy, so if you're not
comfortable taking it apart, you might want to have a professional take a
look at it. Or attempt it and then bring it to a pro if you can't get it
If the plug didn't spark, the first thing that you should try is changing
the plug. However, plugs don't usually quit cold turkey, they usually just
get weaker and weaker. However, give this a try first. If it's not the
plug, then it's likely to be the coil. Especially if the tiller sat in a
very cold environment all winter. As the coil contracts and expands from
weather changes a wire in it can break, causing it to short out. The coil
(coupled with a revolving magnet in the flywheel) is what creates the energy
for the spark. A broken coil means no spark. Replacing the coil can be a
bit involved, it usually means getting a wheel-puller and pulling the
flywheel. Again, you might want to try a professional if you've diagnosed
it this far.
Good luck, post a reply letting us know what you find out.
It started and works great. I was looking at how
the carburator is put together so I can take it apart,
and I saw an adjustment screw directly underneath
I tightened the screw 1 1/2 turns and pulled. Nothing.
I loosened it 1 1/2 turns from its original position, and
it started up and runs perfectly.
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