The Gen 3 cat is one of the best running cat out there, set it up just like Insane's set up sheet and it will run fine. As far as engine and pipe goes you can run just about any combo there is and be happy. Most offshore courses have at least one hard left so you will need a torque engine...
The board that would fry is in the servo, but that would only happen if they were pluged in backward. I would lean toward endpoints on the HS 85. It is possible however rare that the HS 85 was being over drawn on amps and took out the HS 77 or vis versa. Do you remeber if the throttle or rudder...
Did they die on the bench before the boat got run? What size boat is it? The HS 77 does not have a lot of torque especially at 4.8 volts. The HS 85 will not tolerate being over driven for any length of time so I would question end points. Also the Hitec servo connectors do not have alignment...
A brand new carb what ever the model number or where it comes from can pass some trash in the first tank or two of fuel. I would recomend opening it up and cleaning it out and you might as well change the pump and diaphram while you are in there. A stock zenoha carb used to come with black...
For sale is an unfinished BlackBird 21 G2 with hardware. The boom tubes have not been mounted and the hull has one coat of west system sealer and filler that is mostlly sanded off. The steering servo is mounted and the the throttle servo mounts are installed. The only holes drilled in the hull...