information provided should never replace common sense or the
recommendations of the OEM. I do not assume responsibility
the use or misuse of this information. The information provided
based on my experience working as a full time mechanic, on hundreds of
motors over time, reading a lot of manuals, education, and consulting
other experienced mechanics along with a number of retired service reps
I am friends with.
I can offer
any advice from
experience, it would be NOT to try and fix your own motor if you don't
have a good understanding of what you're doing. You need to have
the right special tools, reference materials, and most importantly,
UNDERSTANDING of what is wrong and how to properly fix this
issue. Most people do more harm then good if just messing
around blindly. The reason why I can do these repairs is I've
put in thousands of hours reading, fixing, and practicing. I
something new everyday. I have also gone out and acquired the
necessary, CORRECT tools and reference manuals to work on the
motors. These are very
important to promote correct operation of the motor. The idea is
have a reliable motor, not just one that 'kinda runs.'
Explanation of the basic function of a 2-stroke shot by yours truly.
brief comparison to carbureted motors vs. direct fuel injection.
Old and new technology. Great video from the History channel.
Excerpt from the
Johnson 10th edition service manual (a great read). This
illustrates the power stroke cycle of a 2-stroke internal combustion
engine. Fuel enters via the intake port, is compressed by the
piston, ignited by the spark plug, the expelled/burned gasses via the
exhaust port (out the bottom of your motor, underwater).
aren't your learnings style, here is an impressive video of internal
combustion with a SEE THROUGH motor. Note this is a 4-stroke
motor, so you'll see the fuel charge come in through the lower intake,
a cylinder stroke with no combustion where the exhaust exits the upper
orifice, then the cyle starts over; hence the terms 2 vs
The reason why 2-strokes emit an odor is you are smelling unburned fuel
mix being ejected because both the intake and exhaust ports open
simultaniously. With 4 strokes, there are a lot more parts
working to eliminate wasted fuel charge; i.e. better fuel economy, but
more weight and a lot more parts to break. I'd rather pay at the
pump than out of pockets for more repairs.