MIJ_FZ6
New Member
Finalmpact had a thread on a home made injector test / cleaning the injectors.
I personally would send them out for professional cleaning.
There's a place in Punta Gorda or Port Charlotte (Florida) that tests and cleans them (forgot the name).
This place is recommended by a Master-tech ("Rod-bolt", on the below forum) for Yamaha out board engines.
I thought I had the place saved but don't. This is the site if you want to do a search:
Yamaha Outboard Forum - Yamaha Outboard Parts Forum
These guys are out of Cali:
Fuel injector flow matching