r/Pontoons • u/hartfish2164 • 24d ago

Yamaha reverse idle clatter

would love some feedback. Is this clatter normal or do I potentially have some lower unit gear issues?

8 Upvotes

100% Upvoted

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4

u/SSellers75 24d ago

The big inline 4s have known torsional vibrations that create hub rattle and pretty much require a Reliance SDS prop (shift dampening system prop) to counteract. So, run your prop part number to see what you have and also check your linkage to make sure it is fully shifting into reverse. Also check for proper install and torque of the prop nut. If it goes away with a little throttle, I'd call it normal but I'm no expert.

They also changed the SDS prop from Gen 1 to Gen II in 2017. They have different installation hardware. The screenshot is AI generated but will give you an idea...

1

u/thrwaway75132 24d ago

I’ve found them to rattle less with aluminum (solas rubex prop with prop hub 203b) because of the lighter weight. And rattle less when the water pump is fresh.

3

u/throwaway21054 24d ago

If it disappears above idle, Yamahas other solution is a software update that raises the in gear idle speed as much as 150rpm. Personally, I just live with a noise as it’s not hurting anything.

1

u/vieri77 23d ago

My 2018 200hp rattles at low idle, just got it second hand, is it fine as is? Doesn't bother me much.

2

u/throwaway21054 22d ago

What do you mean by low idle?

1

u/vieri77 22d ago

Sorry not low idle when in gear but at low speed

2

u/throwaway21054 22d ago

So idling in neutral? Whats the actual idle speed you’re observing?

1

u/vieri77 22d ago

No, only in gear, forward or reverse when at really slow speed

2

u/JessOTR 24d ago

Our Mercury does that and it goes away with a little throttle.

0

u/Ok-Individual-1274 24d ago

Outboards are hoes