Are the merc 450s having any shaft breakage issues? What’s merc getting for a pair

[powerabout]

...ever since steve shuble sold oso, along with a number of other boating world influences, yes, oso has changed...and will continue to change... very familiar with oso as well, as i was part of it, since its inception. loooong before you became an oso member & moved to columbia & were messing around with cars stateside in the northeast...

where does serious offshore fit into all this?

[H2OPERF]

1600.00 for the propshaft yikes is it FAA certified too.... No spin welding, 1pc just machine, heat treat, and chrome plate the seal/ prop spline like the old hp shafts. Hopefully for that money your getting some expensive material like inconel or mp35.

[Li'l Toy]

JPEROG--I heard that they are using the new one piece shafts in the 300r's. Do you know if that is the case?

[John S]

Are the Nizpro Yammies an alternative? Or are they just too much of a niche/ expensive?

[JPEROG]

JPEROG--I heard that they are using the new one piece shafts in the 300r's. Do you know if that is the case?

Not correct-

Joe

[JPEROG]

Are the Nizpro Yammies an alternative? Or are they just too much of a niche/ expensive?

I have yet to see one running with all of the poker runs and performance gatherings that we attend and there are hundreds of 450s present. My guess is that new boat buyers like the idea of a warranty and something that will hold up to offshore conditions (not many yamahas in the race circuits).

Joe

[Linesider 159]

Not correct-

Joe

No, he is correct.

300r as of last July comes with 1 piece prop shaft.

Snapped my one piece shaft at 18 hours on my 300r, then put a new 1 piece shaft in and ran it another 80 hours no problem until I sold.

[DangerNewb]

No, he is correct.

300r as of last July comes with 1 piece prop shaft.

Snapped my one piece shaft at 18 hours on my 300r, then put a new 1 piece shaft in and ran it another 80 hours no problem until I sold.

That's also my understanding. Buying a twin engine boat from Randy and he told me the same thing.

[JPEROG]

I stand corrected, mine were both before that date. I upgraded them with the 450 shafts.

Joe

[David]

That's also my understanding. Buying a twin engine boat from Randy and he told me the same thing.

new twin engine boat - details?

[DangerNewb]

new twin engine boat - details?

25 Liberator. Not a new design, just a new boat to me. I had one for about a year with 300xs's and liked it. Was able to sell it at a nice profit and missed it so I ordered a new one with 300R's.

[Chaz]

1600.00 for the propshaft yikes is it FAA certified too.... No spin welding, 1pc just machine, heat treat, and chrome plate the seal/ prop spline like the old hp shafts. Hopefully for that money your getting some expensive material like inconel or mp35.

With the 2000 HP blower motors in our dragsters . It took a ringless 300M input shaft to quit breaking them @ the gear change. As you know, sideloading any shaft in single shear is asking for trouble .

Even worse when the new upgraded shafts come with a tag like this on them ...

不管你付什麼錢，還是便宜的中國貨。$12.95 美國

[powerabout]

Consumer engine with sprayed steel shaft, didnt go well in the 60s
Does the owners manual say take the prop off after every use in saltwater?

[H2OPERF]

Aircraft flap tracks were made from 300m its tough. Mp35n is a nickel alloy that's about as tough and has excellent corrosion resistance, amazing stuff. If they did go with coated steel oh boy...

[WILDMAN]

I am told that the one piece shafts are in all the 300R's after November 2020. I have not had any customers break them if made after that date.