4 Stroke Marine Motor Question

[Jeff '79]

My Yamaha 90hp runs great.
I'm just wondering if I need to add anything to the engine for maintenance purposes.
Oil ? Gas conditioner ?
I've never had one before so it's not like a car motor where I know everything that I need to do.

Yellow bimini. Click the pic twice to blow it up

[Strats-N-Vettes]

Originally Posted by Jeff '79

My Yamaha 90hp runs great.
I'm just wondering if I need to add anything to the engine for maintenance purposes.
Oil ? Gas conditioner ?
I've never had one before so it's not like a car motor where I know everything that I need to do.
Attachment 44918
Yellow bimini. Click the pic twice to blow it up

Am reluctant to help a Trump hater, but bless your heart, it isn't your fault you fell and have to wear a padded helmet,
so.....


I take it your 4 stroke is a fuel injected Yamaha?

Some Yamaha models has a fuel rail with a hidden fuel filter that filters out down to 8 kabillion microns.

With that being said:
stay away from ethanol fuel, it deteriorates rubber and the particles easily clog the hidden fuel filter.
Change fuel filter(s)...add in inline if none is present.
Use best fuel possible.
Use best grade fuel lines and change often (even with seldom use).
Use Sea-Foam injector cleaner (or your fav.).
I do use Mobile1 in my two (115 and 225).
My oil filters are from Merc, Fram, or Yamaha.
Always have fresh spark plugs....you must burn clean to keep Yamaha valves from sticking over time.

If carbureted, never mind the Mobile1, oil filters, or fuel injector cleaner, but, do use the good fuel and fuel lines.
If carbureted, quit leaving it tilted.



If really a two stroke with carb., you need to get better at identifying what motor you have.....


One other tidbit of info; if your model does indeed have that hidden fuel filter and it needs replacing, half the motor has to be torn apart....literally.





Hidden filter is not:
.

[Jeff '79]

It's a four stroke, fuel injected Yamaha 90hp.
I guess that I left out a few details.

[Strats-N-Vettes]

Originally Posted by Jeff '79

It's a four stroke, fuel injected Yamaha 90hp.
I guess that I left out a few details.

What year?
3cyl.?

[Strats-N-Vettes]

BTW---they are just about bullet and idiot proof.

[Norm]

What does the owner's manual recommend? Your answers are probably there. Besides a little Stabile once and a while, probably nothing out of the ordinary. Happy boating.

[Jeff '79]

Originally Posted by Strats-N-Vettes

What year?
3cyl.?

2009
Dunno

[Jeff '79]

Originally Posted by Norm

What does the owner's manual recommend? Your answers are probably there. Besides a little Stabile once and a while, probably nothing out of the ordinary. Happy boating.

The ultimate in social distancing.

[Strats-N-Vettes]

Originally Posted by Jeff '79

2009
Dunno

I think that hidden filter/fuel atomizer dealy is gone by then.

[MEANZ06]

Call Trump...

[snide]

Originally Posted by Strats-N-Vettes

BTW---they are just about bullet and idiot proof.

So, you're saying this is a good motor for Jeff?

[Jeff '79]

Originally Posted by MEANZ06

Call Trump...

I did. He's golfing.

[Strats-N-Vettes]

Originally Posted by snide

So, you're saying this is a good motor for Jeff?

Prolly not, says he knows about cars but doesn't know if the outboard is a 3cyl.

[Jeff '79]

It's my 1st boat.
I took Norm's advice and downloaded the manual.
Yep. I'm wearing the hockey helmet and riding the short bus,so far on this one.
I turn the key, it starts, I go. At the end of the season, a guy comes, throws it on a trailer and takes it for a winterization. In spring, they go through it, the guy brings it to the marina, I turn the key, and I go.
Rinse and repeat.
I was just wondering if it needs oil added or a gas treatment, or anything else.

[Strats-N-Vettes]

Originally Posted by Jeff '79

It's my 1st boat.
I took Norm's advice and downloaded the manual.
Yep. I'm wearing the hockey helmet and riding the short bus,so far on this one.
I turn the key, it starts, I go. At the end of the season, a guy comes, throws it on a trailer and takes it for a winterization. In spring, they go through it, the guy brings it to the marina, I turn the key, and I go.
Rinse and repeat.
I was just wondering if it needs oil added or a gas treatment, or anything else.

Pipe down Pinky....

[Jeff '79]

Will do

[Strats-N-Vettes]

Originally Posted by Jeff '79

Will do

Attachment 44933

[MrPeabody]

Originally Posted by Jeff '79

It's my 1st boat.
I took Norm's advice and downloaded the manual.
Yep. I'm wearing the hockey helmet and riding the short bus,so far on this one.
I turn the key, it starts, I go. At the end of the season, a guy comes, throws it on a trailer and takes it for a winterization. In spring, they go through it, the guy brings it to the marina, I turn the key, and I go.
Rinse and repeat.
I was just wondering if it needs oil added or a gas treatment, or anything else.

At least you did the right thing and went straight to the old man pontoon boat instead of wasting tens of thousands of dollars on a series of speed boats trying to prove you are a 22 year old wakeboard and ski athlete.

[Jeff '79]

Originally Posted by MrPeabody

At least you did the right thing and went straight to the old man pontoon boat instead of wasting tens of thousands of dollars on a series of speed boats trying to prove you are a 22 year old wakeboard and ski athlete.

Ya, it's great. Comfortable and soooo relaxing. I have people for the speed if I want, but at 56 yrs old, I ran my course with that and I'm good.

[MrPeabody]

Originally Posted by Jeff '79

Ya, it's great. Comfortable and soooo relaxing. I have people for the speed if I want, but at 56 yrs old, I ran my course with that and I'm good.

Actually I was kind of surprised you didn't go for a sail boat. I know you've had threads about doing some sailing with friends up in Washington and it sounded like you really enjoyed it. It is a bit physical, though.

Where I live (largest natural lake in California) I have spent a lot of time sailing with friends, although I never owned one.