fl.graderman
Well-known member
I bought my motor from a guy in Kentucky back in December and overall it runs pretty decent, (in my opinion), but I do have a couple "issues" that I've been trying to correct and need a little insight.
First, it's a 1996 Evinrude 25hp 3 cylinder 2 stroke. Model number is E25RMLEDC.
Since I bought it I have replaced the impeller, fuel filter, spark plugs and prop. I also added a marine tiny tach, (so I could accurately upgrade the prop).
The two main issues I have are one, it seems to idle rough. It shakes around pretty good at anything less than about 1300 rpms. I don't know if it has a miss or if this is normal for this motor.
And two, I've got, (what seems like), a lot of oil passing through the exhaust unburnt.
When I changed the plugs, I noticed some carbon on the top of the top piston, so today I dumped a can of seafoam in with about 3 gallons of gas and let it idle at about 1500 rpms for about 30 minutes thinking it would break down the carbon. While I was doing this, I took the induction wire from the tiny tach and switched from plug wire to plug wire trying to determine if all three were firing consistently. This is where it gets weird...
On the top wire, the tach seems to read properly at about 1500. On either of the other two, it was showing 2800 to 3200 rpms. I have the tach set for 360°. Is it possible that the engine was running at the higher rpm and the top cylinder is only firing 50% of the time and that is why I have so much unburnt oil coming through the exhaust?
Also FWIW, at WOT, it's showing me 5700-5800 on the top wire which is about where I need to be.
Here is a link to a short video of it idling to show how much it shakes and the oil blowing by...
https://youtu.be/ap76y2n7m_M
Any thoughts, opinions, advise are appreciated.
Edit to add...I should note that even though I disconnect the fuel line and run the gas out after every trip, it never takes more than two pulls to start and it has never stalled on me at any time.
2015 Tracker Grizzly 1448 MVX
1996 Evinrude 25hp 3 cylinder looper
First, it's a 1996 Evinrude 25hp 3 cylinder 2 stroke. Model number is E25RMLEDC.
Since I bought it I have replaced the impeller, fuel filter, spark plugs and prop. I also added a marine tiny tach, (so I could accurately upgrade the prop).
The two main issues I have are one, it seems to idle rough. It shakes around pretty good at anything less than about 1300 rpms. I don't know if it has a miss or if this is normal for this motor.
And two, I've got, (what seems like), a lot of oil passing through the exhaust unburnt.
When I changed the plugs, I noticed some carbon on the top of the top piston, so today I dumped a can of seafoam in with about 3 gallons of gas and let it idle at about 1500 rpms for about 30 minutes thinking it would break down the carbon. While I was doing this, I took the induction wire from the tiny tach and switched from plug wire to plug wire trying to determine if all three were firing consistently. This is where it gets weird...
On the top wire, the tach seems to read properly at about 1500. On either of the other two, it was showing 2800 to 3200 rpms. I have the tach set for 360°. Is it possible that the engine was running at the higher rpm and the top cylinder is only firing 50% of the time and that is why I have so much unburnt oil coming through the exhaust?
Also FWIW, at WOT, it's showing me 5700-5800 on the top wire which is about where I need to be.
Here is a link to a short video of it idling to show how much it shakes and the oil blowing by...
https://youtu.be/ap76y2n7m_M
Any thoughts, opinions, advise are appreciated.
Edit to add...I should note that even though I disconnect the fuel line and run the gas out after every trip, it never takes more than two pulls to start and it has never stalled on me at any time.
2015 Tracker Grizzly 1448 MVX
1996 Evinrude 25hp 3 cylinder looper