Mercury oil injection delete? - www.ifish.net

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Old 09-11-2019, 04:14 PM   #1
24 on/ 48 off
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Default Mercury oil injection delete?

I have a 2005 150 XR6 with oil injection. I am hearing more and more people are deleting the injection system and running pre-mixed gas, due to failure of the injection pump.


Anyone heard of this or experienced it? Stories?


Thanks!

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Old 09-11-2019, 04:55 PM   #2
pugbuddy
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Default Re: Mercury oil injection delete?

Lots on youtube for 90 yamaha like mine.
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Old 09-12-2019, 05:05 AM   #3
positize
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Default Re: Mercury oil injection delete?

Those engines have great reputations for reliability. Super lightweight, screaming machines: one of the best power to weight ratio motors ever built. But the plastic gear for the oil injection is their weak link. So many folks delete the oil injection and just do premix. I never did this mod on mine, but thought about it for a long time (every time on the water)!

If you are planning on keeping that motor, definitely worth considering the oil injection delete. Looked like a pretty easy mod when I googled it a few years back.
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Old 09-12-2019, 07:29 AM   #4
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Default Re: Mercury oil injection delete?

Quote:
Originally Posted by 24 on/ 48 off View Post
I have a 2005 150 XR6 with oil injection. I am hearing more and more people are deleting the injection system and running pre-mixed gas, due to failure of the injection pump.


Anyone heard of this or experienced it? Stories?


Thanks!
Mercury sells a removal kit. That fact alone should answer your question.. The 2.5 liter race engines never had oil injection and the only box on the engine is the ecm. All those other modules can be removed.. Screamandfly.com has numerous posts on this topic.
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Old 09-12-2019, 10:24 AM   #5
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Default Re: Mercury oil injection delete?

https://www.ifish.net/board/showthre...&highlight=Oil

Not the same motor, but I deleted oil injection on a Merc years ago. The only downside is that with oil injection the ratio is adjusted as needed. With premix you have to set the ratio for wide open throttle.
About double the oil required at idle. This makes for pretty smoky idle and low speed operation.
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Last edited by Merganser99; 09-12-2019 at 10:32 AM.
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Old 09-12-2019, 03:30 PM   #6
Don G Baldi
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Default Re: Mercury oil injection delete?

Quote:
Originally Posted by Merganser99 View Post
https://www.ifish.net/board/showthre...&highlight=Oil

Not the same motor, but I deleted oil injection on a Merc years ago. The only downside is that with oil injection the ratio is adjusted as needed. With premix you have to set the ratio for wide open throttle.
About double the oil required at idle. This makes for pretty smoky idle and low speed operation.
Bingo.
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Old 09-15-2019, 06:55 AM   #7
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Default Re: Mercury oil injection delete?

I ran two fuel tanks. One for low speed operation, around 70 to 1 and the other for high speed, forget the ratio. This was on an Evinrude VRO.
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Old 09-15-2019, 07:57 AM   #8
Chad D.
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Default Re: Mercury oil injection delete?

Quote:
Originally Posted by DogZilla15 View Post
I ran two fuel tanks. One for low speed operation, around 70 to 1 and the other for high speed, forget the ratio. This was on an Evinrude VRO.


While this sounds like a good idea, it sure leaves a huge opportunity to catastrophically lean out a motor when you forget to flip the switch for a run back up the channel.


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Old 09-16-2019, 07:28 AM   #9
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Default Re: Mercury oil injection delete?

Chad: Yup, this isn’t for the forgetful. Running a good synthetic oil can make a difference should a person forget.
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Old 09-16-2019, 09:15 AM   #10
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Default Re: Mercury oil injection delete?

The oil injection failed on my Mercury 150 at around 600 hours. The alarm sounded, I shut it down and used the kicker to get back to the dock. When I pulled it apart, I found that the nylon drive gear was stripped. I pulled the pump, removed the driveshaft, reinstalled the pump, and premixed from then on. If I were to do it again, I'd remove all of the lines and cap them off as well. They do smoke a bit more at low speeds, but it's not big deal. Certainly far less of an issue than oil not being injected.
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Last edited by MattPark; 09-16-2019 at 09:16 AM.
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