Newbie to K&B 3.5 O/B
Sure, why not? Just don't rev the motor up too high while breaking it in. Run it slobbering rich the first few tanks then slowly start leaning it out.
I made an adapter that fits my garden hose. I used an ABS 3/4" threaded fitting, a small piece of 3/4" pipe and an end cap. I drilled a 1/8" hole in the cap and epoxied a piece of 1/8" brass tubing into place. I then ran a length of medium fuel tubing to the water inlet. You don't need much water, just barely crack the tap open. Bypass the water pickup so that the tubing doesn't get caught in the prop.