Carbs full of straight 2-stroke oil 200hp Ocean Pro

[Numlaar]

Hey all,

I decided to repower my boat from an 83 crossflow, to a 94 looper (yeah, I'm poor what can I say).

The looper is a 1994 200hp ocean pro, E200TXERK. 110 (ish)PSI compression on all 6.

When I got it, it wouldn't start at all, the guy told me it had a "carb" problem, so as a precaution, I decided to rebuild the carbs (lost too many pistons because of bad carbs).

When I pulled the carbs, all 6 of them were absolutely slam full of STRAIGHT 2-stroke oil. (I mean straight oil, not one bit of gas). (hence why it wouldn't start, hard to run without any gas). The oil was even a little thick like it had been sitting in them a while. I have no idea how they could have been filled with oil instead of mixed fuel/oil?

Anyway, I went ahead and rebuilt all 6 carbs, and the primer, and hooked everything back up (including the VRO/Oil tank). Started it, and the motor fired right up, no problem. Started immediately, and idled great. I Ran it just a few mins because I wanted to do the waterpump/tstats (also precautionary) as well, but seemed fine for the few mins I ran it.

I let it sit just like 2-3 weeks on a stand in my garage, (everything still hooked up), and decided to fire it up again before I started on the water pump... well it wouldn't start... crank, crank, crank, nothing. Hit it with some pre-mix I sprayed into the carb throats, and it sputtered a bit... after doing that a few times, it fired up, but it smoked like holy hell. It looked like I was fogging for mosquitos. After a min or two of this, it cleared up and seemed to be running ok again...(normal small amount of smoke).

I did some research, and asked around, and someone told me that there is a check-valve in the VRO pump that is probably bad, and letting oil into the fuel side. this would have filled the primer up with oil first (hence it not getting the fuel squirted when choking it to start, so why it was hard to start the second time around) and also why it smoked so bad. I just don't see how it can do this while sitting, when the oil tank is way lower than the engine, the oil tank is on the bottom of the stand (how does it siphon UP oil?)

I checked, and the VRO tank, had hardly any oil used, but again,(1/4" drop in the 1.8gal tank) I have only idled the motor maybe 10 mins. since I got it running and haven't used a lot of fuel yet... so I am not 100% sure if this(bad oil valve) is the case...

My questions:
1. Does anyone have any other suggestions on what I should look for as being the problem? or
2. should I just disconnect the VRO, and run pre-mix? (Yes I know that's a HUGE debate, some say yes, some say no), but I don't have the 500bucks for a new VRO pump right now. (I am already used to pre-mixing on the 83', and the tank is already full of pre-mix anyway).

I am obviously leaning towards just disconnecting it... but want to be sure that there isn't another problem I should be aware of.

Thanks

 

[daselbee]

This is a very interesting problem. It has been discussed here in the past, but NO SPECIFIC FIX has ever been stated.
There have been suggestions offered...one being that the oil tank vent is plugged, and try opening the tank cap to relieve pressure.

But I cannot see how pressure can build in the tank, especially enough to drive such a large volume of oil thru the VRO to fill the carb bowls.
That is maybe 12 oz or so...maybe more.
And what happened to the gas that was in the bowls? Any fluid entering the carbs will be stopped by the float / needle and seat when the bowl fills....this is just weird.

So, I am very interested in the resolution to this. Waiting for others to chime in.

 

[Numlaar]

I agree it does seem weird to me... that's why I want to be sure the disconnecting is the way to go. Originally, the motor sat a long time (1year+), and the mechanic said its possible that the fuel evaporated over that time, and was slowly replaced by the straight oil... that part I can see.

But, after I cleared all the lines, rebuilt carbs, etc. and ran it, there was fuel left in the bowls, and it only sat I think 3 weeks (maybe even only 2 weeks, I honestly cant remember). That wasn't enough time for the carbs themselves to refill with oil, but the primer did, and blue some oil into the cylinders when I was choking it trying to start it, and why it smoked so badly. Once it ran a bit, it "balanced" out to the right mix and was fine.

The oil primer bulb was rock hard when I checked it, so I am leaning towards the tank pressure build up, but again, that seems odd that it can push that much oil up when sitting just a few weeks to fill the lines full of oil to the primer...

Maybe the best thing is to just unhook it all, and pre-mix.

 

[Faztbullet]

Cap bad on oil tank......

 

[Chris1956]

If the previous owner disconnected the gasoline line to run the fuel out of the carbs, straight oil would have been pumped into the carb bowls. Any residual gas could have evaporated.

 

[boobie]

I was told by someone at BRP it was the cap on the VRO tank. Either try replacing that or go the 50:1 route. Cheaper than a new VRO.