1998 Evinrude oil injection removal opinions please

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

Yes, and Joe Reeves supplies a detailed description of how to remove the unit. Raceones' repeititions and frustration aside, I have seen the question of whether to remove it (VRO or mixer) pretty much settled before this thread was even started. But I sort of hoped for some discussion about the mix these things injected when they worked. Was it 100:1, or was the object to provide a richer mix at some speeds and a leaner one at others? Because if these motors ran at 100:1 for any length of time, let's say with a working mixer or VRO, I think any of these motors are suspect regardless of whether the oil injection system is removed. I've suggested this lister should make it clear that the motor needs to be run at 50:1 when he sells it (and maybe has some obligation to tell the buyer it may have been run at 100:1 if the system was working -- and pumped oil at the 100:1 ratio -- or that the system failed and little or no oil was pumped at all, if that happens.) Beyond questions of a seller's obligation, though, I've been inclined to avoid any of these motors for my own use, converted for manual fuel mixing or not.

In other words, whether to remove the fool thing isn't really unsettled. What to expect for these engines, however, may be an issue -- particularly issues of longevity. They may not be worth owning.
 
Last edited:

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

Edit.
 
Last edited:

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

anybody here have misgivings about buying these motors if it has or had a VRO pump or mixer?
 

hidef

Lieutenant
Joined
Aug 22, 2009
Messages
1,465
Re: 1998 Evinrude oil injection removal opinions please

I had no misgivings when I bought mine. The first thing I did was to remove the OMS tank and chamber.

The Oil Mixing System that came on the 35 and 25 triples provided a constant 50:1 mix when it work. It was not a variable design and has nothing in common with the VRO pump used on the larger outboards. As stated else where the engine uses two fuel pumps which sends the fuel to a mixing chamber where oil is added before going into the carbs. Removal is as simple as disconnecting the tank and mixing chamber and connecting the hose that ran from the chamber to cards directly to the fuel filter in front on the OMS chamber.

As for removing it or not was settled by the factory. The recommendation from OMC and later by BRP was to remove the OMS mixing chamber and oil tank. The parts for the OMS system are all NLA (No Longer available). The parts for the separate fuel pumps are readily available. So that pretty much says how the factory feels about the OMS system. The triples are fantastic outboards they idle very quietly and are very economical to run IMHO
 
Last edited:

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

well, not going anywhere with this, so will give up on it. Thanks for the come-back hidef. Sounds like the larger hp models are a little more of a risk than the 25 - 35s (which used a 50:1 mix anyway), although past failure of the system on those also puts them at risk. It seems to me the safest approach is just to avoid any models that have or have had the VRO or mixer. You just don't know what failures went on before in their histories. I recall when this became an issue, the failure rate was pretty high, or at least well publicized. Guys would find a way to just pull them off. But for some of these older motors on the market now, maybe most or all of them, I think it's probably just safest to avoid them. Thanks for the info.
 

blmccall

Seaman Apprentice
Joined
May 29, 2013
Messages
44
Re: 1998 Evinrude oil injection removal opinions please

well, not going anywhere with this, so will give up on it. Thanks for the come-back hidef. Sounds like the larger hp models are a little more of a risk than the 25 - 35s (which used a 50:1 mix anyway), although past failure of the system on those also puts them at risk. It seems to me the safest approach is just to avoid any models that have or have had the VRO or mixer. You just don't know what failures went on before in their histories. I recall when this became an issue, the failure rate was pretty high, or at least well publicized. Guys would find a way to just pull them off. But for some of these older motors on the market now, maybe most or all of them, I think it's probably just safest to avoid them. Thanks for the info.

Thank you all for all the opinions.
Lyle
 

blmccall

Seaman Apprentice
Joined
May 29, 2013
Messages
44
Re: 1998 Evinrude oil injection removal opinions please

Thank you all for all the quality info.
Lyle
 

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

you're welcome, Lyle. Good discussion.

so there is a bunch of motors out there with an oil injection system that fails, and can have catastrophic (OK, lasting) results. What model years and horsepowers are involved?

and now there is reference on another thread (Racerone, I think) to a "magic" quick start system, which also can fail with nasty results. What motors are these?

Let the buyer beware....
 
Last edited:

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1998 Evinrude oil injection removal opinions please

Oldboat, the mixing unit on that motor was 50:1. But it still wasn't worth a s**t.
 

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

thanks, boobie -- still would like a link or website that would show what years and horsepowers were/are involved. A buyer won't know whether there was a failure -- whether or not the mixing unit is still there. Compression test would be about the only thing you could do without tearing it down, I guess. It just doesn't look like a good bet among used motors.
 

hidef

Lieutenant
Joined
Aug 22, 2009
Messages
1,465
Re: 1998 Evinrude oil injection removal opinions please

The Oil Mixing System on the 25 and 35 triples was only offered on those engines and only from 1996 to 2001. That was the total production run of the small triple.
 

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
Re: 1998 Evinrude oil injection removal opinions please

ah. that's helpful. Thanks, hidef! All info welcome -- continue to look for VRO history.

regards.
 

blmccall

Seaman Apprentice
Joined
May 29, 2013
Messages
44
Re: 1998 Evinrude oil injection removal opinions please

Hi y,all.
I guess I should have mentioned that the compression on all 3 jugs was 145+ so maybe damage not done yet.
Lyle
 
Top