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Small Engine Repair (DOC)

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					Small Engine Repair
Small engines are all around us, powering lawn mowers, snow blowers, chain saws,
generators, motorcycles, boats, snowmobiles, and many other handy tools and toys. So
knowing how small engines work and what to do when they don't will put you in good
standing in the Fix-It Club.

How Does It Work?

A small engine is an internal combustion gasoline engine that produces less than 40
horsepower. To produce power, the engine:

   1.   Mixes fuel and air.
   2.   Compresses the mixture.
   3.   Adds a spark to ignite it.
   4.   Exhausts the resulting fumes.

These four steps make up the power cycle. A two-stroke or
two-cycle engine mixes and compresses in one rotation, then
ignites and exhausts during the second rotation or stroke. A
four-stroke or four-cycle engine requires a full rotation for
each of the four steps. Most small engines are two-stroke
and larger ones, like that in your automobile, are four-stroke.
Two-stroke engines aren't as powerful, but they're much
cheaper to build. Small engines have one or maybe two
                                                                Components of a typical small
cylinders or areas where the explosions occur.
                                                                four-stroke engine used to
Another important fact is how the engine is cooled. Car and power lawn mowers, tillers,
other larger engines are cooled by circulating liquid through and other equipment. A two-
channels within them. Because small engines don't develop stroke engine has most of the
as much heat, they typically are cooled by the surrounding
                                                                same components.
air.

What Can Go Wrong?

Regular maintenance can keep repairs to a minimum. A starter rope may be broken or
jammed. A recoil starter spring may be weak or broken. An electric starter battery may be
low, connections may be loose or corroded, or a power cord may be damaged. Air filters get
clogged. Fuel can become contaminated; a fuel cap breather hole may be blocked or a fuel
filter clogged. A fuel line can be clogged or damaged. A choke may become sticky. A belt
may slip.

				
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posted:10/28/2011
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