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tired of prop chatter .any cheap suggestions . f115 Yamaha with a solas prop only at dead idle 750 rpm and above goes away

Have you checked to see if prop nut is snug to hub of prop (washer's in the correct position) or is it loose on the spline?

+yes everything is tight anything above a 500 rpms is quite ,apparently is not unusually on the 115 150 hp with a ss prop

If all that is good, you might be able to adjust the shift shaft for the forward position to put a little more pressure on the clutch dog to take up the slack in the gears. I know you can do this on Evinrude's and Johnson's not sure about yours.

I guess I'm lucky, my F-115 has never made any type of prop noise.

Lot's of info on The Hull Truth Forum if you search there. The solution seems to be a new rubber hub or possibly a whole new prop. Definitely not a cheap fix.

Do you know what your motor is suppose to idle at in gear, you might could just idle it up some. most brands give a general speed + or - some rpms ?. my 150 was 1100rpm out of gear and 900 in gear, my Honda is 750 to 800 out of gear

My 115 had a little chatter when idling last year.come to find out my trim tab was just loose enough to vibrate and make the noise. Just saying it's worth checking.