Originally Posted by Bert H.
Indeed, it is the same engine as the Toyota 1 HD, but has been converted by Yamaha for inboard engine. ME 420 STI. What I seek is the preheater of yamaha for this engine.
I think you will find that Yamaha build this engine for Toyota not the other way round. I agree with Biff. Run a 12 volt feed and push button through a relay direct to the end glow plug £10 will see the job done. In reality none of the electronic boxes on this model do that much anyway and the engine will run with one 12 volt feed to the stop switch. I have had to hot wire these engines on many occasions Alan P