Got the 240 merc running, but idle is 3000 rpm

[Polcat]

I changed the fuel pump, and cleaned the vapor tank, and she fired right up, but at 3000rpm
I tried to give it throttle, and the rpm sent down, but the continuous alarm was going off.,, any idea what that could be??
Thanks

 

[Polcat]

Also is it normal when flushing, for water to come out of the exhaust??View attachment 37779

 

[Dr Honda]

Your picture isn't working... but yes, water will come out the exhaust.


On that note........

The constant alarm is over temp. AND, generally, a garden hose doesn't have enough flow to keep your engine cool. So, I hope you didn't run it long with the alarm going off.

As far as the high idle... Get into the side of the engine and make sure the linkage isn't binding. You should be at 1000~1100 RPM.

 

[Polcat]

Your picture isn't working... but yes, water will come out the exhaust.


On that note........

The constant alarm is over temp. AND, generally, a garden hose doesn't have enough flow to keep your engine cool. So, I hope you didn't run it long with the alarm going off.

As far as the high idle... Get into the side of the engine and make sure the linkage isn't binding. You should be at 1000~1100 RPM.

I shut it down within 20 seconds of the alarm.. It just seemed weird that when I gave it throttle, the Roma went down.. It also seemed like the jet didn't kick in..

 

[philipmurphey]

I don't know what you mean by the jet didn't kick in. Your drive shaft that turns your impellor is always turning when the engine is running. It does not have a real neutral like a outboard. We have a reverse bucket that drops over the jet stream to redirect the jet flow under the boat. When bucket is half up and down, that is neutral. As doc mentioned, the garden hose is not enough for the water flow in most cases. You can take your boat to a boat ramp ( not during busy times ) and back down enough to submerge the pump and try again with running engine. Your idle will probably drop since you are under a load since impellor is still turning water even though reverse bucket is in neutral.

 

[Polcat]

I don't know what you mean by the jet didn't kick in. Your drive shaft that turns your impellor is always turning when the engine is running. It does not have a real neutral like a outboard. We have a reverse bucket that drops over the jet stream to redirect the jet flow under the boat. When bucket is half up and down, that is neutral. As doc mentioned, the garden hose is not enough for the water flow in most cases. You can take your boat to a boat ramp ( not during busy times ) and back down enough to submerge the pump and try again with running engine. Your idle will probably drop since you are under a load since impellor is still turning water even though reverse bucket is in neutral.

Ok thanks.. Yeah, I guess I'm used to my dads outboard, where it clicks when your in gear!!!

 

[Lumps]

I shut it down within 20 seconds of the alarm.. It just seemed weird that when I gave it throttle, the Roma went down.. It also seemed like the jet didn't kick in.. View attachment 37784

HI. I am new to the murcury engines but it doesn't look like much water is coming out. When mine is on a hose and running water gushes out everywhere. Is it possible you have a blockage in Your cooling path somewhere. May explain why you are overheating. Or maybe 3000 rpm with low water pressure from you house tap?

 

[Polcat]

I know In The pic it doent look like a lot of water, it its comming out the bottom pretty good.. I'm going to take it to the boat launch tomorrow am

 

[Polcat]

I know In The pic it doent look like a lot of water, it its comming out the bottom pretty good.. I'm going to take it to the boat launch tomorrow am

It's the throttle cable.. Its not going back all the way.. I can push it back manually, and it idles around 1000 rpm.. I took it out today, and seemed to run good.. Got it to 50 once just to see. It was around 6000rpms.. Most cruised all day around 30mph.

 

[Lumps]

Good news. I guess the alarm didn't go off anymore?

 

[Polcat]

Not today.. Is there a way tolubd the throttle cable??

 

[Lumps]

Not today.. Is there a way tolubd the throttle cable??

I have never done it myself but I read a post where the guy had created an adapter to put his compresser on the end of the line and force some sort of lubricant down the line. It may have been the steering cable and it might have been a Rotax style seadoo. I think the consensus was it's just better to replace the line.

 

[SeptemberC]

I have never done it myself but I read a post where the guy had created an adapter to put his compresser on the end of the line and force some sort of lubricant down the line. It may have been the steering cable and it might have been a Rotax style seadoo. I think the consensus was it's just better to replace the line.

I agree! REPLACE the cable! Always better to be safe than sorry!