Smoke after rebuild

[Japes15]

Ok... I bought a boat with a 1986 150hp evinrude. When the motor was checked out by a mechanic, it ran rough, compression was good, and he said it needs new fuel lines, rebuilt carbs, and a new vro. So... I rebuilt carbs, put new fuel lines on and bit the bullet and bought a new fuel pump (fuel only, no more VRO). After the rebuild I put new fuel in tank at 50:1.

I used the ear muffs and got the motor rolling after the rebuild. Seemed to run great! smooth in and out of gear with no sputtering... The only thing is that it was smoking pretty good. I can't remember if it did this when I first got it checked out... any ideas why its smoking so bad?

 

[Bifflefan]

Re: Smoke after rebuild

Im not sure as to what a VRO is but, isnt it an oiling system for the motor?
If so then you have oil injection and oil in the gas = to much oil...
50:1 will smoke a little when its cold, and a little less when warm.

 

[Japes15]

Re: Smoke after rebuild

I got a VRO "no oil" pump. So you must pre-mix or engine goes bang. The original VRO had the oil side plugged and the previous owner was already pre-mixing oil. The gas was a couple years old so I drained it and put new fuel in so I knew I was running 50:1.

 

[kenmyfam]

Re: Smoke after rebuild

Ok... I bought a boat with a 1986 150hp evinrude. When the motor was checked out by a mechanic, it ran rough, compression was good, and he said it needs new fuel lines, rebuilt carbs, and a new vro. So... I rebuilt carbs, put new fuel lines on and bit the bullet and bought a new fuel pump. After the rebuild I put new fuel in tank at 50:1.

I used the ear muffs and got the motor rolling after the rebuild. Seemed to run great! smooth in and out of gear with no sputtering... The only thing is that it was smoking pretty good. I can't remember if it did this when I first got it checked out... any ideas why its smoking so bad?

1986 should be a VRO system and if your motor still has the VRO hooked up and you are also premixing your fuel then you will be doubling your oil mix to around 25 to 1.
Check for an oil resevoir tank being hooked up to the motor.

 

[Japes15]

Re: Smoke after rebuild

1986 should be a VRO system and if your motor still has the VRO hooked up and you are also premixing your fuel then you will be doubling your oil mix to around 25 to 1.
Check for an oil resevoir tank being hooked up to the motor.

see last post... sorry I wasn't more clear in my first post. I edited it. Maybe this will help, its the only picture I have. It also only ran for about 2 min before I shut if off... Pee stream was great so no worries of overheating.

 

[kenmyfam]

Re: Smoke after rebuild

see last post... sorry I wasn't more clear in my first post. I edited it. Maybe this will help, its the only picture I have. It also only ran for about 2 min before I shut if off... Pee stream was great so no worries of overheating.

Looks like we were typing at the same time there !!!!
It actually does not look to bad from the photo.
Suggest a decarb to clear any cobwebs. Check the "Top Secret Files" at the top of page one in this section.

 

[crxess]

Re: Smoke after rebuild

He said FUEL ONLY.

Yes you can get a lot of smoke on muffs. Have you finished the carb adjustments?
Did you do a link and sync?

 

[Japes15]

Re: Smoke after rebuild

not sure what a decarb is... and I have not messed with adjusting the carbs... I didn't mess with any of the sync parts so my hope was that I wouldn't have to when I got it all back together.

 

[kenmyfam]

Re: Smoke after rebuild

He said FUEL ONLY.

Yes after it was edited after I posted and wrote the other response at the same time as me. Check the timing of the postings.

 

[samo_ott]

Re: Smoke after rebuild

That doesn't look too bad. It'll be less on the water. Or use full synthetic for even less smoke.

 

[kenmyfam]

Re: Smoke after rebuild

not sure what a decarb is... and I have not messed with adjusting the carbs... I didn't mess with any of the sync parts so my hope was that I wouldn't have to when I got it all back together.

Check the top secret files at the top of page 1

 

[SparkieBoat]

Re: Smoke after rebuild

yes on the lots of smoke when running cold and with muffs...it is probably ok...make sure your carbs are adjusted properly....I rarely see a hooked up VRO anymore....LOL I just ordered the fuel pump only replacement for my 150. Should be in tomorrow
I do not think that you can rebuild the VRO pump..so its just buy a new one if it quits...Can you rebuilt the fuel only version???? Thats my question in my answer to a question.

Sparkie

 

[Bifflefan]

Re: Smoke after rebuild

not sure what a decarb is... and I have not messed with adjusting the carbs... I didn't mess with any of the sync parts so my hope was that I wouldn't have to when I got it all back together.

Smoking looks about normal.
The decarb is "Seafoam" gets the carbon build up off the piston heads and such. Smokes like a house on fire...Good thing is no skeeters for a while.

 

[Japes15]

Re: Smoke after rebuild

I was told that there were 3 ways to go about getting a new fuel pump... #1 was go with a $350 true VRO pump. #2 was a VRO "no oil" (which i found for $280). and #3 was buying 2 $100 fuel pumps and jerry rig it to work... and I THINK you can rebuild the VRO "no oild" but I could be wrong... its brand new so I hope I don't have to worry about that anytime soon...

 

[Japes15]

Re: Smoke after rebuild

Checked out the decarb. Sounds easy enough. I'll do that before I put it in the water. It needs a little work to the keel before it gets wet though.

 

[kenmyfam]

Re: Smoke after rebuild

Checked out the decarb. Sounds easy enough. I'll do that before I put it in the water. It needs a little work to the keel before it gets wet though.

Decarb is well worth it.
Good luck and keep us all posted.