Yamaha 25hp 2 stroke

[Scooby]

Looking for some advice tiller steering quite heavy is it possible to remove the trim tab or will this upset the outboard don't really know it's purpose
Thanks

[spartacus]

Steering shouldn’t be heavy on a Yamaha 25hp. Is this engine new to you? I also assume you mean doel fins rather than a trim tab? Normally you only get trim tabs on larger boats.

Also rule out that the outboard isn’t seized with dried out grease. There should be grease nipple points on the outboard leg. Yamaha 25hp can normally turn on sixpence with bit of throttle. Great engines.

[Scooby]

It's fine when off the plane but hard to turn when on the plane there's a black finn on the underside of the gearbox that has different marks on it for adjusting it I believe it's something to do with propeller torque

[beamishken]

Originally Posted by Scooby

It's fine when off the plane but hard to turn when on the plane there's a black finn on the underside of the gearbox that has different marks on it for adjusting it I believe it's something to do with propeller torque

The tab shouldn't make much difference to be honest, sounds like either a problem with the steering bushes or possibly lack of grease, could also be a trim issue or height issue. Maybe try playing with the trim angle & check the height of av plate relative to the hull

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[Scooby]

Engine is 2007 but has only 20 hrs on it and is like new turns with very easy when idling and only stiff when reaching speeds of above 16 mph very odd

[beamishken]

Originally Posted by Scooby

Engine is 2007 but has only 20 hrs on it and is like new turns with very easy when idling and only stiff when reaching speeds of above 16 mph very odd

In that case & assuming it doesnt have a steering friction adjustment then I'd look at trim & height being the issue

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[Steve509926]

Hi Scooby, I think in this instance a picture of the "trim tab" or is it a "torque tab" may help.
If it's an after market fitment I can't think of any reason why you can't take it off and see if that improves things.

[Scooby]

Hi Steve, It's definitely standard fit
I believe it's to help with prop walk not quite sure what that is will post pictures

[beamishken]

Originally Posted by Scooby

Hi Steve, It's definitely standard fit

I believe it's to help with prop walk not quite sure what that is will post pictures

The fin your talking about is intended to offset any tendency for the steering to wander to one side or the other. Even if it was miles off it wouldn't cause heavy steering it would just tend to pull to one side. They are often the anode for the engine so even the manufacturers didn't put much faith in them making them deliberately corrode away.

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