Any vessel rated for more than 3 HP is not a kayak, by definition, even if it’s called a motor kayak or a kayak on steroids.
Wavewalk’s S4 is rated for 6 HP, so it’s not classified as a kayak, although at 100 lbs it weighs as little as a fishing kayak, and it paddles much better, both solo and in tandem. Many S4 owners use it as a fishing kayak and/or a touring kayak.
Technically (legally), the S4 is classified as a Multi-Hull Boat, and Wavewalk labels it a Car-Topper Microskiff for commercial reasons.
An S4 driven with a 9.8 HP motor is considered as Overpowered, and it cannot be driven with such a motor unless both its transom and motor are modified especially for this purpose.
Inexperienced drivers should avoid trying this, especially in states that forbid overpowering boats.
Experienced drivers should take the time to learn how to control this very lightweight craft when it’s overpowered.
Driving an S4 in waves bigger than 2 ft must be avoided, especially in conditions known as “Washing Machine”, when waves hit the boat from different directions and might cause an unsuspecting driver to lose balance.