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now we're gonna spend just a few minutes to review some fundamentals are the most
basic technologies employed in out board today
two-stroke and four-stroke design even though they have their distinct
differences they draw for specific benefits for customers
with the knowledge of the key components of two-stroke and four-stroke technology
you'll be able to better apply an understanding of the innovations that
Yamaha has introduced over the years
and refining these power systems Yamaha 2-stroke and 4-stroke outboard use the
same basic principles and any internal combustion engine compress atomized fuel
within an enclosed
cylindrical space ignited expanding gas releases a significant amount of energy
for BP's controlled explosion south
times a minute using the created energy to drive a series the Pistons
transform and energy into rotation and toward rock fracture
that is the baseline operation the internal combustion engine but today
there are two popular mechanical designs to make that power
two-stroke and four-stroke engines both use a very intimate intake compression
combustion
exhaust operation cycle let's take a look at how they make their power
we'll start with the two-stroke now the job to stroke means one firing cycle or
combustion process is performed for every two strokes
one up one down a pissed 1 360 degree revolution at the crankset
here's what that looks like in a two-stroke engine the fuel intake
process is called scavenge
as the piston moves downward the intake or transfer Port au Prince
the air/fuel mixture that's been pressurised in the crankcase
passes into the cylinder exchange with burned gas to be exhausted
from the last bus on the compression stroke the piston moves upward the
scavenging our intake port and exhaust forecloses
at the air/fuel mixture is compressed inside the cylinder as this happens the
crankcase develops negative pressure
vacuum polls open one way reed valves
the Droid new air/fuel into the crankcase to be pressurized
get ready for the next firing site just before the piston its top dead center
a spark from a spark plug causes the compressed fuel to ignite
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