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Motors - Model Comparisons & FAQ's

  • Standard Version in Aluminum Finish
  • 10:1 Compression Ratio
  • Hand selected parts for precise tolerance match
  • Enlarged transfer ports (45% larger)
  • Crankcase transfer ports enlarged
  • 12 - 14% more horsepower than stock
  • Enlarged exhaust ports
  • Balanced compression between cylinders on multi-cylinder motors
  • 11:1 Compression Ratio
  • Lightened piston pin(s) and piston(s) for faster throttle
    response and less vibration.
  • Intake manifold included
  • The Competition Series finish is a brilliant Copper Flame Metallic color

Twin Spark

  • Available on motors with cylinders of 75cc displacement or larger
    (3W-75, 150, 157, 200, 275, 342, 684)
  • Higher efficiency fuel burn adds approx. 100 RPM
  • Safety and redundancy of having two complete ignition systems

Reverse Rotation or "Pusher Configuration"

  • Any 3W motor can be reversed
  • Uses traditional "tractor" propellers mounted backwards
  • No outrageous "pusher prop" costs
  • Larger selection of propellers to choose from
  • Simple to change from "tractor" rotation to "pusher" rotation

Rear Shaft

  • Available on many motors without rear induction
  • Keyed and tapered shaft with center bolt
  • Simple location for on-board electric starter-generators
  • Standard feature on 3W-342iB2 & 684iB4

Decompression Valves
Available on engines with cylinders that are 50cc in displacement or larger

Valves are opened before starting to reduce cylinder compression and enable easier starting of larger engines. Valves automatically close once the motor has been started.

Decompression valves are strongly reccomended for applications where an electric starter is used. The valves eliminate the possiblity of a hydro-lock condition which can damage the engine when an electric starter is used while the motor is flooded.


3W Technology is Always Advancing
3W has always taken pride in being on top of the latest motor technology.
In an industry where other manufacturers stay with the same design for many years without change, 3W is constantly exploring new technologies to improve quality and performance. Over the past year 3W has developed more than a half dozen new motors, with a few more scheduled for release next year.
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New Metallurgy Techniques:
By adding a small amount of titanium to their castings, 3W has made the viscosity of the molten aluminum much more fluid during the time of casting the motor parts. This yields the ability to make more complex shapes and and finer quality castings that are stronger, lighter, and have a nicer finish.
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New Porting Technology:
With the benefits of the new metallurgy techniques, 3W was able to concentrate on improving the performance of the motors with enhancements to the cylinder design. By adding 2 additional exhaust bypasses and splitting the transfer ports onto 6 separate precision timed ports, the result was impressive. A cylinder having only 1% more displacement than its predecessor yielded over a 10 to 15% power increase
(depending on the model).

How do I break-in my motor?
  What fuel / oil do I use?
  How do I start my engine?
  What is an intake manifold for? Why would I need one?
  I want to send my motor in for repair. What do I need to do?
  My propeller bolts sheared off. Why?
  How do I drill the mounting holes in my propeller?
  Should I "soft-mount" my motor?
  What is involved in reversing the rotation of my engine?
  Should I use a fuel filter before my carburetor?
  How long is the warranty?