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SSR hub or Solid hub for Tourquemaster
2023 Pro XS SN:3B394985
So I drop by my prop shop to purchase the SSR hub for my spare prop. The Prop guy stated that the SSR has a bulletin out and Mercury now recommend the solid hubs. I asked to see the bulletin and was advised it was dealer only. I assumed he was telling the truth as I was prepared to buy the SSR hub and did not need a solid hub as I already have one. During the search as recent as September the SSR seemed to be the goto hub.

2023 Phoenix 920 Elite
2023 Mercury Pro XS 4S
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Mercury 3L/4 Stroke/Verado Moderator
There are service bulletins but not indicating to "not run SSR hub kits on V8 Fourstroke models".
I would use the HD Racing (solid) until I had my favorite prop selected and then install the SSR into that prop.
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Kind of strange - my local mercury dealer ordered me the older style hub with the new nut locking system.. Mechanic said that it might be a little louder, but it is better. That was the first time I had heard anything regarding new vs old style.
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Mercury 3L/4 Stroke/Verado Moderator
They improved the solid hub casting as it's now has some of the more critical dimensions machined (in addition to the double-nut kit).