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So if it’s a noisy Prop, what does that tell me? (The prop was brand new).

Thanks for the suggestion! I confirmed today that the noise does not happen when it’s in neutral through the RPM range. It didn’t seem to be happening in reverse either. Then I switched props, Back to my original one that I use at sea level, And the noise was gone. But what does this tell me...

I was able to find a used version of the upgraded lower unit design for my 1998 Honda BF40. I got it all put together and went for a test drive today. There is a noise I never heard before, kind of a "whirring/ringing" sound that occurs between about 2000-2700 RPM. With the motor in neutral, I...

Oh and one more variable. I was operating it today at 6000' elevation! Much higher than ever before. Could the noise have something to do with that, rather than coming from the lower unit?

Thanks for this advice! I was able to find a used version of the upgraded design. I got it all put together and went for a test drive today. There is a noise I never heard before, kind of a "whirring/ringing" sound that occurs between about 2000-2700 RPM. With the motor in neutral, the prop...

Thanks for the reminder about anti-seize! I had almost forgotten! I prefer to try to keep stuff well maintained, because a breakdown at the wrong time can be real bad!

So I was able to find a used version of the upgraded design lower unit (41100-ZZ5-020ZA 40-50HP '07 and Newer 20") Question: does anyone know if the two bolts that replace the locknut on the old design need maintenance? With the old design (locknut into internally threaded housing), they...

That Makes sense... Thanks! BTW - I'm getting a used lower unit. It's "recommended" to change the impeller.. Anyway to tell if it's still perfectly good? Like if the rubber is soft and not brittle/cracked? Anything else to look for?

thanks Guys.. When in doubt, I err on the side of safety and reliability (especially with a sensitive and critical part like an impeller). Towing is way more expensive and ruins the fun!

I've always wondered... I can get a Sierra impeller for 1/3 the cost of the same impeller from Honda. Is Honda all mark-up, or is it really better quality? Is Sierra made from lesser quality materials/tolerances? Or just as good?

Well, I've gotten replacement quotes between $650-$1050. I'm really disappointed I lost mine. BTW, were slant back covers something that cam from the factory, or are they all add-ons?

I've found a used replacement lower unit I'm considering buying (40hp Honda). The paint is worn off at the tip of the skeg, and underneath is a dark color that looks like primer. The seller says a part of the skeg the size of a silver dollar was chipped of, but welded and repaired. Any reason...

Nice.. Would you say the 7 pounder was a Springer, or a Blackmouth?

Good plan, I like it! Thanks for your input. Been out fishing lately?

and considering that although in good condition now, the rest of the motor is 16 years old. So putting a new lower unit on there will probably outlast the rest of the motor by a longshot?, or can I expect the rest of the motor (Honda) to also hold up for the long haul, knowing it's current in...

Yes, thanks for asking.. it's the 16' I'll be keeping (not selling). Yes, I'll just put a lower unit on, and be back in action! But the question is weather to get a used one for cheaper, and then keep an eye on it, or the new upgraded one that won't require special attention, but is twice the...

I agree about the lower unit, and I agree about maintenance.. I was waiting to find a buyer for one of my boats who would give me first right of refusal if they ever wanted to sell. I found them, so I'll be selling to them soon. I keep one C-dory in Southern Utah (Near Lake Powell), and my...

Salmon Fisher, Thanks for your response. And yes, I appreciate your comment and do not take offense. Analysis paralysis does set in sometimes! In this case, I do plan to just get an entire lower unit. But I have some options: (1) I can spend the big bucks ($1500) for the upgraded version...

AHHH, Good point! Same lower unit for BF40's and BF50's, but maybe different gear ratios for the two different horsepowers..?

I do know that they have upgraded the lower unit design to eliminate this problem. It's a much better design. Rather than an inside-concentric locknut, there is a different geometry with two regular bolts inside. And this upgraded lower unit is available for older motors, for about $1500.