Evinrude 115 HELP

95cajun

Seaman
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Feb 22, 2010
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55
I just bought a boat with an Evinrude 115 outboard on it I think?!?! Model on the bracket is 115999R S/N J0002087 The block has numbers on it also the middle of the motor behind the flywheel is 396 244 (bigger letters) 1 IK23 Then on the left side clinder near freeze plug is FL2784 the cylinder and the block or intake are stamped 9604. Any info on this motor would be helpful. known facts : It is a 4 Cylinder non VRO, the cover says its a evinrude 115 the Mounting bracket is from a 1978 135 HP (I really hope this is right)
 

ezeke

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Sep 19, 2003
Messages
12,532
Re: Evinrude 115 HELP

115999 is a 1979 model number. That has a different block than the 1978.

What are the numbers on the welch plug on the engine block?

BTW, no 135HP motors were made in 1977, 1978, or 1979
 

95cajun

Seaman
Joined
Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

looked agian, there is a little round plug on the left side cylinder bank (looking at the spark plugs) It doesn't look like a typical freeze plug, nothing stamped on it. Guess I'll have to look better in the daylight. Maybe it was rebuilt? Has great comprssion 135 or so on all 4.
 
Last edited:

ezeke

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Sep 19, 2003
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Re: Evinrude 115 HELP

The welch plug should be on top (looking down) of the starboard cylinder bank.

The 1979 block has the mounting feet cast into the block, the 1978 and earlier ones are screwed on. Click the thumbnail.
 

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95cajun

Seaman
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Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

okay mine is at least a 1979 block, it has the little ears on the block that the lower cowling is bolted to. guess the is no way to tell what the Hp is.:(
 

Dhadley

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Feb 4, 2001
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Re: Evinrude 115 HELP

FL2784 indicates that it was the 2,784th powerhead remanufactured by Flagship in Florida. That was quite some time ago.........
 

ezeke

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Re: Evinrude 115 HELP

Why do you think it isn't a 115? Does it have a bubbleback exhaust cover or flat?
 

95cajun

Seaman
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Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

flat plat between the two cylinder heads. I don't have a title for the motor and I just want to be sure. A v4 could be up to a 140 hp and some where down to an 85 hp. the lower unit has 1697cc on it. Don't quote the number
exactly. I mailnly need to know for parts replacement issues. You guys are great! I'm real close to getting the right motor or close enough.
 

95cajun

Seaman
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Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

I also need to know the MFG recommended RPM so I can select a prop.
 

ezeke

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Re: Evinrude 115 HELP

No 140s were built with flatback exhaust.

115 crossflow had a full throttle range of 4500 to 5500 and should be propped to max 5800 at average load.

All 85HP, 100HP, 115HP and 140HP were 1632 cc in 1979.
 

95cajun

Seaman
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Feb 22, 2010
Messages
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Re: Evinrude 115 HELP

Thanks for your responces!! Your awsome. I'm starting to believe that it is a 115 now. it there any other telltale keys to finish narrowing it down?
 

ezeke

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12,532
Re: Evinrude 115 HELP

You could check the carburetors for numbers - you will have to remove the air silencer.

Pictures of the engine would help.
 

Chris's CVX16

Seaman Apprentice
Joined
Feb 25, 2010
Messages
41
Re: Evinrude 115 HELP

That sure sounds like a '79 J 115.

The 115 from that year, like my 100, is a flat back.

If you get the silencer cover off you should be able to see some numbers on the front of the carburetor. The 115 from that year uses 1 3/16" barrels.
 

95cajun

Seaman
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Feb 22, 2010
Messages
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Re: Evinrude 115 HELP

I don't know alot about 2 stroke boat motors. I can just about fix anything though. so riddleme me this??!!?? How do the increase the HP? If they are all the sam CC then it must be with carbs and Air? If I put larger carbs on it do I increase the HP or decrease the life of the motor. I have three carbs off of a 200 hp v6, just a thought.
 

ezeke

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Sep 19, 2003
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12,532
Re: Evinrude 115 HELP

HP ratings were achieved using a variety of differences which included different porting, different carburetors, different orifices, and different cylinder heads. The exhaust systems were different as well.

By the time that they finished re-rating them in the mid 1980's, there were no more 140HP V4 crossflows.
 

95cajun

Seaman
Joined
Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

so the bore and stroke is the same. Manage the air/fuel in and exhaust out and you get more power. I never knew that. I'm going to leave this motor alone it has very even compression all the way accross all around 130 psi. that's cold engine numbers. This is on a 19 foot cajun fish and ski. It sounds a little underpowered but I have yet to get it on the water. Alot of these boats have 150 faststrike's on them. I hate to go up to a V6 cause of the weight. Seems like a healthy 130 to 14o hp V4 would kick a 150 hp V6 cause of the added weight of the V6. Therefore if I up grade I want to go with a 200 Hp V6. these motors are great motors, the boat is rated for 190 hp and here in Texas we can go 49 Hp over max. But Before I spend any money I want to see how the combo works. I don't have to be the fastest on the water, right now feul economy is more important.
 

95cajun

Seaman
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Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

so I was working on the boat today. Just would not start turns over good but no start. pulled the carbs and sprayed carb cleaner through all ports. some gel in bowls. put it back together and she fired right up. sprayed evinrude tune up in carbs for a few minutes. went back to turn off the motor and I heard a buzzer going off. shut the motor down and noticed that one side of the motor was hotter than the other. also noticed that while it was running it was peeing well and water was gushin out of one of the upper exhaust holes. it was comming out of the same side that the head was hotter on?? I figure that one of the thermostats is sticking. so i tore into it and am going to replace the thermostats and gaskets. does it sound like I'm on the right track? do you think I hurt the motor? Once agian....Help:mad:
 

95cajun

Seaman
Joined
Feb 22, 2010
Messages
55
Re: Evinrude 115 HELP

FYI the problem with this motor all along was one bad power pack, and the idiot I bought it from didn't add oil to the gas! Turns out I was right and some people don't know that motor overheating doesn't always mean a coolant problem!
 
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