Valve rework and startup of 2004 Yamaha F90

[99yam40]

Re: Valve rework and startup of 2004 Yamaha F90

Good chance that #2 throttle plate is closing all the way or at least more than the others and that is why it is not getting enough air in to compress.

 

[Fragamag]

Re: Valve rework and startup of 2004 Yamaha F90

Yea, I think you are right Yam, My next step is to use a fluid manometer and see if I can get it close. But, do you thing it would be wise to go back into the carbs and reset the floats? That may by my low end stalling problem. I am just tickled pink that my compression is good.

 

[Fragamag]

Re: Valve rework and startup of 2004 Yamaha F90

Went back into the carbs and reset each to .53, Specs are from .49 to .61. Changed out all fuel lines. Preset all carbs to app .008 clearance on the valves. Put them back and runs much better. I did notice that if I try to get out of the hole with the trim up, it bogs slightly, but if I bring the trim all the way down, I can jump out of the hole with no problems. This sure makes me feel better about everything, but still want to sync the carbs.
Thanks to everyone for your interest, pointers and support.