Fouled Injectors > Low RPM & Smoke?

[Northeaster]

Hi folks (PMd Never Monday as well, as he ran the prop #s for me last year)

Wrote last year about being overpropped. The prop calc recommended about a 14x8.5 or 15x 7.5 prop, (my current 3 blade fixed is 15" x 10")

With my 2gm, I can hit 3600 in neutral, but only about 2000-2200 rpm in gear (clean bottom and prop), before lots of smoke and no increase in speed.
Not lacking speed as I run around 6kts at 2000rpm or so, and hull speed is not much more than that.

Took prop to an experienced guy today to have it depitched a couple of inches, or -1" diameeter and -1" pitch, or so.
He said that he could do that, but didn't think the a couple inches would make that much difference- he was really concerned that I only rev so low now.

Question: Could bad injectors (plugged, bad spray, etc) cause me that much smoke, and inability to rev higher (combined with likely being somewhat overpropped as well)?

Don't mind paying to have the prop depitched some, but wonder if there are other issues as well. Hate to depitch too much, if it could be the injectors bad, possibly giving similar symptoms.

I don't mean to beat a dead horse, but do not want to splash the boat, only to find I could have done something different. I will get the injectors checked anyway, but have to decide on how much to modify the prop ASAP.
I am looking to purchase a used feathering / adjustable pitch prop, which would be great - having the ability to adjust in water. (not sure if deal will go through yet)


My trannie is a 1982 km2a (not p). I believe it is 2.62:1. He told me to verify that, as if it were, say 2:1, that may explain things a bit. Not at the boat till the weekend, so will check then.


Thanks, in advance, for your time, and patience!!