Outboard yamaha 350hp 4strokes 2000 how much timing where is the timing point

Safe rule of thumb is 2 loose leaf papers jammed between the points and one side of a cardboard cover for storing those pages between the magneto and the flywheel. Grew up poor and still use those trucks to this day.

Sounds like it has a fuel restriction. Hook up a fuel pressure gauge on the vst tank on the motor to make sure you have 30-50 lbs of fuel pressure.

Try this site..Didn`t know what year...Cheers

http://forums.iboats.com/Yamaha-Outboards/Timing

Broken wire in loom,white wire,bad connection in loom plug,if it switches off with kill switch,then it points to ign switch

This will be a good source of info for Yamaha outboards: http://www.marineengine.com/boat-forum/forumdisplay.php?37-Yamaha-Outboard-Forum
Yamaha Outboard Forum

Looks like 2002

The timing is set wrong OR You cannot let these 4strokes sit and idle.They all do it.They need to be ridden to get the air flowing over them to keep things cool.30 secs. idle at start and after a ride,idle for 10 secs. then shut it down.The sparks will probably be carbon build up inside the motor.You get it hot and they break away and come out through the pipe.All the 4strokes are a HP motor and will get hot if you sit and let it run.Hope this helps