1998 9.9 yamaha ht electrical random start.

[CapeRobert]

Just bought a 30ft. Sailboat with that motor. It spins well but only starts very rarely. Then will just spin until some future random time it starts. It is electrical. But not sure what. The coil tested at 390ish ohms resistance.

 

[wrench 3]

Welcome aboard.
If you tested for spark and found it lacking, go to http://boatinfo.no/lib/yamaha/manual...maha.html#/218 ignition system testing starts on page 219.