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Hi all! I don't often ask for advice here but now I'm stuck. I'm trying to fix a friend's Yam o/b.
The problem is at full throttle opening. The motor will run for about 10 secs then dies. Idles ok and part throttle is ok. Starts again ok.
To me it sounds like fuel starvation at full power.
I've changed the line from the tank to the o/b. Cleaned the coarse filter in the tank. Changed the in-line filter. Checked the diaphragm in the motor's mechanical fuel pump. Even spliced in an electric fuel pump (rated at 170l/min) and by-passed the mechanical pump but the problem is still there.
Now I'm starting to pull my hair out! A new pump costs 190€ (diaphragm costs 170€ on it's own so no point just replacing that) so I don't want to spend that and still have the problem.
So, what have I missed? Or is there some other clever system in the motor which needs replacing? Any ideas?
The problem is at full throttle opening. The motor will run for about 10 secs then dies. Idles ok and part throttle is ok. Starts again ok.
To me it sounds like fuel starvation at full power.
I've changed the line from the tank to the o/b. Cleaned the coarse filter in the tank. Changed the in-line filter. Checked the diaphragm in the motor's mechanical fuel pump. Even spliced in an electric fuel pump (rated at 170l/min) and by-passed the mechanical pump but the problem is still there.
Now I'm starting to pull my hair out! A new pump costs 190€ (diaphragm costs 170€ on it's own so no point just replacing that) so I don't want to spend that and still have the problem.
So, what have I missed? Or is there some other clever system in the motor which needs replacing? Any ideas?