You better give that thing some more fuel if those A/F ratios are accurate on the dyno sheet.

That’s typical (ie: very insccurate) for dyno that uses airflow hat turbine and fuel flow meter to give a/f ratios. Instead of widebsnd O2.

OP: can you have them send you dyno chart with every 100rpm data vs the given 250 rpm steps ? Thanks

Thank you for the advise. I cant get anymore dyno info.
I wish I had a better understanding of the dyno info. What would you like to see for a/f ratio? I just bought the boat last fall.

AFR's should be 12-13 range. If those are correct, its way lean on fuel.

Prop it for 5200-5300 rpms with a light load. It will drop 100-200rpms with heavier loads and higher temps/humidity.

Thanks Griff,
It's strange that the engine builder would send it out the door if the a/f ratio wasn't right. I will be sure to read the plugs when I get in the water.

You guys may have skipped over my post post a few above.

It's okay. i do it all the time. Just want to make sure you don't do it again or ELSE !!!!!! Lololololol...kidding...

LOL, I seen it.

Jeffer, as SB said if those aren't wide band readings they're just a calculated average so to speak.
I see the graph has an 05 date on it anyways, if it was dynoed back then and been running problem free since, my guess is you're good. Hard to say.

Thanks to all that responded. I really appreciate the help!

Good info here. Helps me out as well. Thanks everyone!