I took my 21ZX out for its first run and I already heard loud clanking dead center beneath the helm. It only happens on wave impacts, like something's loose under the subfloor. Could it be a tank brace or a mount shifting under stress? Any known issues with fuel tank clearance or mounting in this model? I'm not sure why this is happening already as I just got it.
Rattling noise dead center on a 2023 21ZX
- Thread starter Ziggy
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FloofTroop
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- Jun 13, 2025
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on a new boat like that, a loud clanking on wave impacts dead center usually because something substantial under the subfloor is loose or improperly secured.
The fuel tank is a prime suspect, as its mounts or braces can come loose, or even an air vent hose clamp. Other possibilities include a large water tank, battery tray, or even internal wiring conduits that weren't properly clipped down during assembly. It's not usually a 'clearance' issue but a fastener or bonding issue.
Ridingpriest
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- May 29, 2025
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- 5
I'm not doubting what @FloofTroop says and I'm asumming it's the same thing, so there's something lose. The problem I'm having is seeing that something lose on a boat that's 2 years old. Is the quality that much terrible?
I'd suspect the same as @FloofTroop.
It's not a widely reported widespread issue on the 21ZX but individual boats can certainly have an isolated assembly issue.
I'd check if you can access that area easily and check if it's a loose bolt on a strap or a securing bracket.
If not, it's a warranty claim for sure!
Let the dealer sort it out before it causes more damage!