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Author Topic:   1996 Evinrude 115-HP Carburetor Cleaning

redfishslayer posted 10-07-2010 02:18 PM ET (US)
I have a 1996 Evinrude Intruder 115 just rebuilt this month. Is there anyway to clean the carburetors with out removing them from the engine? The carburetor in question is on the port-top side and the piston connected to it was running fine with a 125-PSI before engine failure; after rebuild compression has dropped to 112-PSI. The other pistons are sitting at 125-PSI, if not [higher]. We did a wet compression check on port top side and it went up to 125-PSI. Then went back down, so it is running lean. [I] am thinking that the needle valve is getting stuck in that carburetor. I would hate to have to take it off. I would like to go fishing. I have missed most of this season. If [the carburetor] is running lean like that, [I] am scared that [the motor] will only last one season, if that. My husband doesn't think it is anything to worry about, but I'm thinking money in long run. PLZ HELP.
Tohsgib posted 10-07-2010 02:42 PM ET (US)
If husband thinks that way...make sure he has $10k laying around for a new engine...SOON!
rebuilder should have rebuilt the carbs, if not [complain], if so take it back to him. It is no big deal to pull a carb. I doubt needle valve, more like adjustment or dirty. Richen it up some and let her rip. Throw some Techron in the tank on a heavy dose for a run as well. Throw a little oil in the gas if still using VRO as insurance. I personally would go through that carb again but if Hubby wants a new engine...
redfishslayer posted 10-07-2010 05:12 PM ET (US)
Can the [caburetors] be cleaned without taking them off the engine[?] [I] was thinking maybe drop the bowl or run [Seafoam] thru the engine. Just throwing ideas out there.
weekendwarrior posted 10-07-2010 05:26 PM ET (US)
My personal experience has been that if a carburetor is really dirty, you're going to have to shoot something through the jets and passages to clean it. Just some cleaner in the fuel rarely fixes a very clogged carb. So, can you get the bowl off and get to all of the jets and passageways with a can of carb cleaner and some compressed air? If yes then maybe you can pull it off, just be aware that carb cleaner disolves oil so try not to get a bunch in the motor if you can avoid it.
That said, the best way to get good results is to remove the carb and clean it off the motor, plus you won't get carb cleaner in your motor this way. Also some rubber parts on the carb won't like carb cleaner (the rubber might swell) so try to keep the cleaner off the rubber. With that cylinder dropping pressure, I am wondering if it isn't already damaged?
Good luck!
Fitness4all posted 10-08-2010 06:04 PM ET (US)
As a backyard (but high class done right) outboard mechanic, I've seen my share of silly fixes. For example I just serviced a 1994 90 HP that I removed the VRO on and had a vacuum line not attached. This may or may not be your problem. If that cylinder has low compression it will naturally pull less fuel than the other cylinders running at higher compression. Ensure vacuum lines are attached.
For a direct answer to your question, no, there is nothing you can spray/put through the carburetor to clean it. Not that there aren't products out there intended for such purposes, but they're rather expensive and may leave you disappointed. I'd suggest a carburetor clean if the mechanic actually admits to not cleaning a carburetor on a rebuild. If he's smart he won't admit to it.
[Changed topic to discuss another system. Please start a new thread for that topic. Thank you--jimh]
Good luck!
-Rob
contender posted 10-08-2010 11:26 PM ET (US)
Carburetors need to come apart. How do you know if [the problem] is just dirt? I just had one of my carburetors go out. The needle fell off the fulcrum and got stuck on the pivot rod and stayed shut. No amount of spray would have fixed it.

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Author	Topic: 1996 Evinrude 115-HP Carburetor Cleaning
redfishslayer	posted 10-07-2010 02:18 PM ET (US) I have a 1996 Evinrude Intruder 115 just rebuilt this month. Is there anyway to clean the carburetors with out removing them from the engine? The carburetor in question is on the port-top side and the piston connected to it was running fine with a 125-PSI before engine failure; after rebuild compression has dropped to 112-PSI. The other pistons are sitting at 125-PSI, if not [higher]. We did a wet compression check on port top side and it went up to 125-PSI. Then went back down, so it is running lean. [I] am thinking that the needle valve is getting stuck in that carburetor. I would hate to have to take it off. I would like to go fishing. I have missed most of this season. If [the carburetor] is running lean like that, [I] am scared that [the motor] will only last one season, if that. My husband doesn't think it is anything to worry about, but I'm thinking money in long run. PLZ HELP.
Tohsgib	posted 10-07-2010 02:42 PM ET (US) If husband thinks that way...make sure he has $10k laying around for a new engine...SOON! rebuilder should have rebuilt the carbs, if not [complain], if so take it back to him. It is no big deal to pull a carb. I doubt needle valve, more like adjustment or dirty. Richen it up some and let her rip. Throw some Techron in the tank on a heavy dose for a run as well. Throw a little oil in the gas if still using VRO as insurance. I personally would go through that carb again but if Hubby wants a new engine...
redfishslayer	posted 10-07-2010 05:12 PM ET (US) Can the [caburetors] be cleaned without taking them off the engine[?] [I] was thinking maybe drop the bowl or run [Seafoam] thru the engine. Just throwing ideas out there.
weekendwarrior	posted 10-07-2010 05:26 PM ET (US) My personal experience has been that if a carburetor is really dirty, you're going to have to shoot something through the jets and passages to clean it. Just some cleaner in the fuel rarely fixes a very clogged carb. So, can you get the bowl off and get to all of the jets and passageways with a can of carb cleaner and some compressed air? If yes then maybe you can pull it off, just be aware that carb cleaner disolves oil so try not to get a bunch in the motor if you can avoid it. That said, the best way to get good results is to remove the carb and clean it off the motor, plus you won't get carb cleaner in your motor this way. Also some rubber parts on the carb won't like carb cleaner (the rubber might swell) so try to keep the cleaner off the rubber. With that cylinder dropping pressure, I am wondering if it isn't already damaged? Good luck!
Fitness4all	posted 10-08-2010 06:04 PM ET (US) As a backyard (but high class done right) outboard mechanic, I've seen my share of silly fixes. For example I just serviced a 1994 90 HP that I removed the VRO on and had a vacuum line not attached. This may or may not be your problem. If that cylinder has low compression it will naturally pull less fuel than the other cylinders running at higher compression. Ensure vacuum lines are attached. For a direct answer to your question, no, there is nothing you can spray/put through the carburetor to clean it. Not that there aren't products out there intended for such purposes, but they're rather expensive and may leave you disappointed. I'd suggest a carburetor clean if the mechanic actually admits to not cleaning a carburetor on a rebuild. If he's smart he won't admit to it. [Changed topic to discuss another system. Please start a new thread for that topic. Thank you--jimh] Good luck! -Rob
contender	posted 10-08-2010 11:26 PM ET (US) Carburetors need to come apart. How do you know if [the problem] is just dirt? I just had one of my carburetors go out. The needle fell off the fulcrum and got stuck on the pivot rod and stayed shut. No amount of spray would have fixed it.