Can't agree more on the knife for cutting out ropes! Last summer I think I cut a dozen ropes out of friends skis when they sucked up dock lines in the water.A Fish Fillet Knife long enough to reach and cut Rope thru the Intake Grate. And Long Reach Needle Nose Pliers.
Compression Gauge to check for Piston damage.
Spare Spark Plugs. Spare Fuses. The Bilge Pump should also have an Inline Fuse installed. Seen Bilge Pumps start a Fire because they had no Fuse.
Digital Multi-Meter for Electrical troubleshooting from the Battery to ALL the Ignition and Stator Coils. Easier to do if you have a Deutsche type weatherproof connector on the Stator Wires. That way the Coils can be tested when they are WARM.
Primer Spray Bottle or Spray Can.
A Portable Battery Operated Bilge Pump for $15 at Harbor Freight
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