Martin,
Remember that if you use the motor in California waters, you must register the pontoon with DMV and then the registration numbers must be affixed to the craft and displayed according to regulations. I have encountered a few pontoon and float tube users with mounted motors who have found this out the hard way via citations issued by the Coast Guard, Harbor Police, Sheriffs deputies, or rangers.
http://dmv.ca.gov/boatsinfo/boatreg.htm
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