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Name:	Pontoonfisher -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 10:24:58 AM

I want to here some opinions on disconnecting the oil injection system on a 1997 90HP Mariner outboard and mixing the oil and gas the old fashion way. I have to replace the fuel line where the oil and gas lines connect and was thinking about disconnecting the oil system all together. I have heard horror stories about these systems failing and burning up the motor.

Name:	CAT BOAT -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 11:16:00 AM

Now thats a good question, that will gather many opinions. Here is mine! At the Prattville shop last week, we replaced a 1999 Yamaha 225hp powerhead that failed because of oil injection failure. Last week, we replaced two cylinders on a Yamaha 800 PWC that were damaged from oil injection pump failure. (countless others in the past) I feel that both of these units would have been running for a long time if this had not happened. Yours is 1997 model! That is 14 years old! Obviously, you are beginning to doubt its ability to properly mix/lubricate your fuel and engine. My opinion, take it off. BUT, make sure you do it properly. One thing is for sure..... If you mix it yourself, outside of you just plain forgetting to do it, you want loose your engine to oil injection failure. If you have any questions about this, call me and we will chat. Steve

Name:	Maverick -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 12:42:29 PM

Did this in on a 200 Mercury EFI outboard then Cat did it right, as the yahoo who did it originally did not do it 100% correct. Think Steve ordered a kit to do it the correct way, he could tell you better than me.

Name:	CAT BOAT -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 1:38:35 PM

Mav, at least I got the outboard right. Your Master Craft keeps bittin' me on the butt. Maybe you just sell it to me. We like yours better anyway. And yes, if you remember, we ordered that kit that included the little block off plate, and a small insert to hold a bushing in place. I am not sure his system is like that, but prolly is similar.

Name:	Pontoonfisher -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 2:48:08 PM

On most systems that you have seen fail were they gear driven or electric oil pumps. The one on my outboard is a gear driven. This does not worry me as much now.

Name:	CAT BOAT -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 3:17:06 PM (updated 7/11/2011 3:18:55 PM)

I have not spent much time trying to figure out exactly what failed. To me, it is not important. I say this because when it fails, for whatever reason, it is too late. (I speak of pump failure as a general conversation, and maybe should have said oiling system failure) Normally, there is no warning! On the Yamaha, a simple rubber feed line came off. The cable tie became brittle, and fell off of the injector assembly. The oiling system may have been working properly, and the line just fell off! The pump assembly is probably just fine, I am not sure, but I am thinking the cable tie broke because it was old, brittle and caused an engine failure. ($6500 WORTH) Without complicating the subject, at what point in time do you decide not to use the system any longer? There is no majic date. But, if your system is old, and you are not quite sure or confident of your oiling system, then I suggest you do away with it. If you choose to do that, you will NOT have a failure from oiling issues on a two cycle. EVER! Yep, your pump maybe fine, but the rest of the food chain maybe at risk. My .02 worth. CAT,

Name:	Maverick -	Reply
Subject:	Oil injection systems
Date:	7/11/2011 6:17:34 PM

Our oil injection failed because of a plastic gear inside a $10,000+ motor and motor was 10 years old. Guess we should have replaced the oil injection pump once every five years or so. So figured would rather have to premix oil then rely on a $.02 part (which you cannot change) than spend another $5k on a rebuild.

Also just an FYI, my lake neighbor had his Johnson fail twice before he removed oil system (had to fool him twice), he said never again would he have a 2 stroke that was not premixed.

Name:	Pontoonfisher -	Reply
Subject:	Oil injection systems
Date:	7/12/2011 7:13:19 AM

Points all well taken. The system is working fine but it makes no sense to rely on this system when the motor is 14 years old.

Name:	greycove -	Reply
Subject:	Oil injection systems
Date:	7/12/2011 9:10:17 AM

Wondered what symptoms a rider would experience should the oil injection fail? I know, the engine explodes, but should an alarm sound? Will the engine begin running different to alert the rider of trouble? Obviously, the engine will overheat, but how would one know since it is under cover?

Name:	CAT BOAT -	Reply
Subject:	Oil injection systems
Date:	7/12/2011 9:59:14 AM

You would not get a "beep" if a line fails (Not that i know of anyway). You will get a "beep" if the tank becomes low, that I know for sure (unless the beeper isnt working). Symptoms would be a slowing of the engine, and at that point it would be too late.

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