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Yamaha 70 hp 2 stroke outboard oil injection #7665511
09/05/22 04:42 PM
09/05/22 04:42 PM
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DWC Offline OP
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Recently got this motor, a 2001, and put a jet pump on it. It has an oil injection on it and i just topped it off yesterday before going out. I see there is a smaller tank on the right side of the main tank. I THINK there is oil in there from the looks of it, but i would have to remove some stuff to get to the cap for that. Ive read it is some sort of back up reservoir?? Was this manually filled or is this some kind of overflow from the main tank? I was looking at it today to verify it was using oil, and saw it looked several ounces down after burning 5 gallons of gas. Just making sure I wasnt supposed to be doing anything with this second tank.

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665532
09/05/22 05:16 PM
09/05/22 05:16 PM
Joined: Mar 2019
Posts: 1,486
Southern NJ
maintenanceguy Offline
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maintenanceguy  Offline
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Don't know what the little tank is for but if you weren't injecting oil and burned 5 gallons of gas - you would know.

A lot of guys don't trust the injection on older outboards and just mix gas so nothing goes wrong. Nothing sucks quite like having an outboard quit on your boat when you're miles away from civilization or the nearest boat ramp. I know.


-Ryan
Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665540
09/05/22 05:32 PM
09/05/22 05:32 PM
Joined: Jan 2021
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Ontario
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RustyShacklefrd Offline
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Ontario
It's a reserve oil injection tank I had one with it.

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665549
09/05/22 05:52 PM
09/05/22 05:52 PM
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Anyone know how it gets filled? The cap isnt accessible easily so im guessing it gets filled off the main?

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665585
09/05/22 06:42 PM
09/05/22 06:42 PM
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Ontario
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RustyShacklefrd Offline
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Mine was a 115 so a little different maybe but you could fill it from the top with the cap. The main oil tank was completely separate from the motor.

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665689
09/05/22 09:56 PM
09/05/22 09:56 PM
Joined: Feb 2014
Posts: 10,488
Ky
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jbyrd63 Offline
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Donít touch it There is an oil pump that pumps from the main tank up to that one The engine mixes from the small one injected into the cylinder as it runs !

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: maintenanceguy] #7665691
09/05/22 10:00 PM
09/05/22 10:00 PM
Joined: Feb 2014
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Ky
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jbyrd63 Offline
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Ky
Originally Posted by maintenanceguy
Don't know what the little tank is for but if you weren't injecting oil and burned 5 gallons of gas - you would know.

A lot of guys don't trust the injection on older outboards and just mix gas so nothing goes wrong. Nothing sucks quite like having an outboard quit on your boat when you're miles away from civilization or the nearest boat ramp. I know.


You have to get a kit to stop oil injections. If you put it in gas plus the engine is oiling it fouls then plugs quick .
Yamaha is one of the best leave it alone

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665694
09/05/22 10:02 PM
09/05/22 10:02 PM
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Ya i hadnt planned on messing with it, just wasnt sure how it works. That makes sense though. Thanks.

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665699
09/05/22 10:08 PM
09/05/22 10:08 PM
Joined: Feb 2014
Posts: 10,488
Ky
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jbyrd63 Offline
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Ky
Any time! Enjoy it

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665716
09/05/22 11:35 PM
09/05/22 11:35 PM
Joined: Jan 2007
Posts: 19,081
Georgia
warrior Offline
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warrior  Offline
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Georgia
The first generation OMC self oiling motors were the ones that had issues leading many to distrust and delete. But that got that fixed on later makes.

But it's left a common idea to delete and go back to premix.

Re: Yamaha 70 hp 2 stroke outboard oil injection [Re: DWC] #7665767
09/06/22 05:13 AM
09/06/22 05:13 AM
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hippie Offline
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I had a Yamaha snowmobile with oil injection back in the '80's and it was the cats meow. Worked great!

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