Yamaha stalls

[THEFERMANATOR]

Wasn't sure what HP where they all went fuel injected. I know in 03 there smaller 4 strokes were still carbed engines. Since it's injected, have you checked the throttle body to see how carboned up it is? I believe yamaha uses a pwm style iac, and I'm not sure if they have adaptive iac or not. I know I've had a couple come to me stalling, iac was working fine, but the throttle bodies were so gunked up the iac simply couldn't let enough air by to keep the idle up. Cleaned the throttle bodies, and no more stalling.

It doesn't hurt to put a fuel pressure gauge on it either. I had one years back(think it was a 115) where the boat had sat for a long time, and the vst was full of just nasty crusted up crap from sitting with fuel in it. It would run great for 5-10 minutes, then itwould start stalling. Put a fuel pressure gauge on it and seen the pressure would drop. Ended up having to pull the vst apart, soak and clean everything inside of it, put it back together, and then flush the injectors out to get it back to stay runni,g.