Evinrude 75 - 1983 WOT no power RPM ~ 2100

[Quick-man]

I took my boat out for the first time with the new (1983) Rude 75. I rebuilt the carbs, all compression is good.

Here is the story this time: BTW Thanks for all the help!!!

I can sit at idle all day, with the engine in neutral I can increase the RPM to 6000 and maybe higher but why blow things up.

When I go to WOT the engine RPM increased and was still climbing past 4000 RPM and the boat was almost on plane when the rpm dies to about 2200. I placed it in neutral and increased rpm again I can red line it. Placee it back in gear and now there is no increase in rpm to 4000 and dies, it remains at approx 2200.

I have an inboard tank, that I put stabil in last winter, The primer bulb is firm, I then thought well maybe it is bad gas or something with the the fuel system, I got the 6 gal can out and bought a new hose and fittings and fresh gas and still have the same results. I am thinking fuel pump but not sure, if it was the fuel pump wouldn't it also act that way when I am sitting there getting the rpms as close to red line without blowing it up?

 

[StratosRob]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

Had that happen befor it turned out to be a small peace of trash in the mainjet in one carb. I would try to clean the carbs

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

I just cleaned the carbs soaked them in Berryman's Chem Dip for a day each blew them out they're like brand new. I think the filter on the fuel pump would block any junk that could get picked up. I guess it could happen though, but I think it might be something else.

 

[StratosRob]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

Make sure the timer base is moving when you put it in gear,

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

Yes I thought of that too, the timer base is moving and if I am in neutral I can red line the tach but if I am in gear there is an increase to about 4K rpm's then it dies to approx 2200. From that point on it will not go over 2200 in gear. It will if I take it out of gear and throttle up to red line and I am sure it would get higher but who wants to kill a good (or not so good) engine.

So without a load the engine has great rpm with a load the engine bogs down after the initial 4000 rpm is reached. Fuel pump? Or anything else anyone can think of. BTW I am the only one on board and weigh in at 190lbs. Not that this makes a difference but the boat is not overloaded.

 

[dave 416]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

check for spark?

 

[clint]

Evinrude 75 - 1983 WOT no power RPM ~ 2100

Sounds like an ignition problrm. First check timer base and go to spark plugs and wires. A bad wire will put it down to half throttle under WOT load. Good Luck!
Clint

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

Had good spark at idle, but that is not to say that at WOT there could be an issue. I am breaking down and taking her into the marina for a look. I'll let everyone know what happens dropping it off Monday for a look on Tuesday, Maybe I'll learn something.

Thanks everyone for your input.

 

[npd4432]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

I have the same engine as you do (E75TRLCTE) I had this happen to me one time when I was on the water. The plastic shroud inside the carb. linkage was broken and did not sync all the carbs together. The boat could not get out of its own way. Bought new plastic shrouds, all was well. By the way dont rev the motor to that high of an RPM when in neutral. I have had this motor for 3 years now and have only done some routine maintainence and replaced the rectifer, runs great you wont be dissapointed.

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

Thanks npd4432,

I'll have a look and see if that happend, it would be nice if it did, then it is an easy no issue fix.

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

No plasitc broke I was hoping it was something simple but that is not my luck.

The latest on this issue.
We have a no wake zone that takes about 10-15 min to get through, during that time I am running at approx 2000 rpm so as to avoid a ticket. When you get to the marker you can go as fast as you want. Last night I went out agian to see if I can get a better understanding of what's happening. I get out of the no wake zone hit the throttle and to my surprise the engine springs to life getting about 5200 rpm and running good. I back it down and try again. Same thing up on plane 5200 rpm (which is a little low...prop). Back it down again and then hit it again and sure enough comes to life. I am running about 600 yards and then the same issue happened, back to 2100 rpm and I limp home. The engine is not overheating the warning buzzer works and would have told me this I also replaced the impeller this year.

I am thinking that this is a component that is failing due to temperature maybe the rectifier, a coil or something like this.

Thoughts????

 

[hoeser]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

I am wondering if something (electrical) is failing under the vibration... it's interesting that it let you get up to full throttle under load just those 2 times, and that it cuts you off to 2100rpm... when it is running at 2100rpm is it smooth? Maybe it's cutting out one of your cylinders... sometimes its hard to even notice.

I once had water leaking in to a cylinder on my 140 V4 due to a bad head gasket which killed off one cylinder entirely and it was hard to tell it was running on only 3 cylinders at high rpm, it just didn't have the same power.

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

Good thought but shouldn't my compression be down on one cylinder? They are all at approx 140 to 137. Could be a vibration thing but every time I get up to 4000, and this last time 5000 for a while then died down to 2100, this is driving me nuts. But I'll get it sooner or later hopefuly sooner since I am missing some good fishing.

 

[Quick-man]

Re: Evinrude 75 - 1983 WOT no power RPM ~ 2100

I took the boat out last night. I was able to get a bit further than before, before the engine backed down to 2100 rpm. I got back to the dock and checked spark. The bottom cylinder had no spark the other two had strong spark. I swapped plugs to make sure that it was not a dead plug, and the spark plug lead to make sure it was not that either. The wire and plug are good. After sitting for a while and the engine cooled down, spark returned to the bottom cylinder, although that spark was not as strong as the other two. Any ideas? I'm thinking coil?