How to disconnect oil injection on a OB motor

Not a fan of oil injection, might buy a motor that has it, what is involved in disconnecting this? Would rather mix. Thanks

depending on the motor and how its injected I want you to realize that the carb(s) are not jetted for premixed fuels and it will be lean on the idle and main jet circuits.
and,,, it will tend to be way more smoky than usual, reason being with injection the oil ratio may be near 100 to 1 at idle and 40 to 1 at full bore.
so now you will get to sit in a smoky environment when trolling around and there is no wind.

if it is working correctly now, leave it alone.

What would happen if I split the difference at about 60:1?-will not be trolling much with this little motor and a little smoke is ok.

if you are not going to be trolling a lot you could mix it 50-1 to stay on the safe side.
as I said,it will be more smoky at all rpm’s, the worst you will be doing is loading up the plugs and fouling them out with excess oil.
the reason it will be lean is because you will be displacing gasoline with oil.
less gas = lean.

curious, which brand of motor are you looking at converting?

A Suzuki.

I took a guess as to what year and HP (80’s 15 and 25 hp) to find a two stroke zuki and looked at how the pump and metering was designed and built, it doesnt get much better than what I saw in the drawings.
if it were J/E or Merc I could give you part numbers to accomplish what you are wanting to do but I have to admit I have no clue on a zuki.
and again, oil injection on these motors are very very accurate as well as dependable and should be left alone until a problem arises and even then I would spend the money to fix those systems.

I wont try to talk you out of it especially with me not knowing the history of the motor you are looking at and the fact you sound determined to do it if you buy it.
that said, if it aint broke dont fix it, good luck with whatever you decide.
if I can be of further help shoot me a pm.

No chance in hell I’d disable a perfectly functional oil injection system.

What he said^^^^^^^^^^^

Ralph Wiggum wrote:

No chance in hell I’d disable a perfectly functional oil injection system.

Except some have been known to fail. And when it isn’t noticed immediately bad things happen.

munchy wrote:

Except some have been known to fail.

Meh. I guess I’d “roll the dice”, but it wouldn’t worry me enough to disable a system that works and (I’m guessing) has been working just fine for a number of years.

well ok, the motor is small and should be potable, so I am putting it on and taking it off the boat, is the oil reservoir one more thing to make this cumbersome? I have actually heard that zuki had great engineering for injection, but generally have heard these systems can fail w/bad consequences. Would probably only use this motor 5x a year.
thanks

It seems like the 1980’s Mercury/Mariners were the only motors that had much of a problem with the oil injection systems.

Are the oil injection motors much bigger than the mix ones?

Tim, 4 Stroke problem sovlved………

2 heavy, but thanks, going on and off the boat. Love my 4S on the boat where it stays on.

munchy wrote:

Except some have been known to fail. And when it isn’t noticed immediately bad things happen.

Except this happens about half as often as guys forgetting to add oil to their pre-mix outboard’s tank and blowing it to kingdom come that way. Of course the guys who do this seldom if ever admit it.

Excluding HPDIs and depending on which OI system we’re talking about, having the injection fail and blow the engine is either impossible or nearly impossible.

IMO removing a working OI system makes the engine more failure prone, not less.

Have read your stuff for years Grouse-I will not disconnect, thanks.

Oh, so TFG has credibility?!?!.

Get your name on a bottle of good whiskey and you will have credibility too! (Ralf whiskey, hmmmm)

Buddy of mine has an 80s Merc. 150 hp. He disconnected the oil injection system at least 10 yrs ago and adds oil when he gasses up. He has never had a problem. Good luck.

I’ve seen guys who want to get rid of oil injection on their O/B’s but still drive 2 stroke OI sleds all winter. It’s interesting for sure.

Personally I wish my chainsaw was OI too LOL. Take the mixing out of the equation because I’m messy.

the VRO went bad on my 89 evinrude and now I premix. a bit smokier but i’ll be honest it seems to run better all around. someone told me to do it immediately but i didn’t. the guy at evinrude told me the johnson/evinrude will buzz at me if there is a oil issue. he said if you ignore it you will blow the motor

KPE wrote:

I’ve seen guys who want to get rid of oil injection on their O/B’s but still drive 2 stroke OI sleds all winter. It’s interesting for sure.

It’s also interesting to me that guys will run an oil-injected outboard for 10, 20, or even 30 years and then suddenly wake up one morning and determine that they need to get rid of that “unreliable” oil injection system… Yeah, makes sense, it’s run for 30 years so you definitely want to listen to some internet wrench jockey who’s telling you to rip it out because it’s “unreliable”.

The only “problem” I ever had with VROs was that they HATED the cheap oil that you occasionally had to buy at marinas. My last 150 Johnson VRO would smoke like a cheap cigar on anything but Penzoil Premium Plus or full synthetic.

VRO = very rarely oiled? My VRO was blocked off when I bought my boat and I know many people who have blocked theirs off. But Tim is looking at doing it to a Suzuki. OI are not the same from one manufacture to another. I have not heard of many people having problem with the Suzuki OI system