140 HP nightmare

[jaycat2692]

I am in despearate need of help on this engine. It is a 1985 140 hp evinrude. I ran the boat a couple of times this year, and on my most recent trip the boat started acting up. It will run great on the hose, but in the water spits, sputters, and when in gear will not get the boat over about 2100 rpms. Has new gas,plugs,battery, and powerpack. thanks for any help

 

[R.Johnson]

Re: 140 HP nightmare

It sound's like it may be going into SLOW. Did you do a compression test before changing those parts?

 

[jaycat2692]

Re: 140 HP nightmare

yea i did compression check 120 on all four cylinders. Do they have S.L.O.W. on that early of a motor? it hasnt overheated or anything, just started this one day out of the blue.

 

[R.Johnson]

Re: 140 HP nightmare

No! Your engine did'nt have the SLOW feature. If you don't have a peak reading volt meter, I don't know how you could do a running test on the ignition. For fuel, you could take a sqeeze bottle of pre-mix fuel, and spray it in the carb throats', and see if the engine pick's up. That could find a dirty carb. if that is the problem.

 

[tashasdaddy]

Re: 140 HP nightmare

you have great compression, but sitting is what they hate. if spark checks good, jumps 1/2 inch, is say 99% you have contaminated carbs, dirty high speed jets. old gas turns to varnish, if you have original fuel lines, they are not alcohol resistant, (ethanol in fuel). they get soft and sluff off on the inside, this goes to the carb bowls, settles, clogging the pickups for the jets. if you have not change all fuel lines to alcohol resistant, and carb cleaning, and rebuild kits for each. 85 did not have slow feature.

 

[jaycat2692]

Re: 140 HP nightmare

yea i've tried to spray into the carbs, there isnt really any change. the motor sounds great same as always when on the muffs. i can pull the plug wires and notice the change in engine running. Seems to be firing ok, plugs are just slightly wet, not flooded. just cant figure why it would start all of the sudden.

 

[larsst185]

Re: 140 HP nightmare

this sounds as exactly the same thing as my 87 225 does.I thought it was one of my power boxes that was shot but after changing this and taking it for a test run today it died on me again.only difference here is that it stops completely after a while.I hate my evinrude right now.....

 

[jaycat2692]

Re: 140 HP nightmare

i hear that, funny thing is i took it the a boat shop after it happened and they supposely hooked it up to computer and found nothing wrong. yet mine still runs the same

 

[jaycat2692]

Re: 140 HP nightmare

Any chance this could be a reed valve problem? When i took the carbs off I dug a rubber plug off out of one of the reeds.

 

[daselbee]

Re: 140 HP nightmare

i hear that, funny thing is i took it the a boat shop after it happened and they supposely hooked it up to computer and found nothing wrong. yet mine still runs the same

WTF? Ain't no hooking a 1985 engine to a computer....get your money back.

 

[jaycat2692]

Re: 140 HP nightmare

Only paid for an hour of work thankfully, learned my lesson with taking it to them. So does the reeds sound like a solution?

 

[R.Johnson]

Re: 140 HP nightmare

The tool to have here would be a peak reading volt meter, and a service manual. Guessing at a problem can get exspensive, and frustrating.At this point you have not checked the charge coils, sensors, power pak, or coils under running conditions. I realize this meter is exspensive, but sometimes that's the way it is. That hour on the computer would have made a good down payment. Who in the hell ever had the gut's to tell a customer something like that.

 

[kenmyfam]

Re: 140 HP nightmare

O.K. I have a 1985 140hp looper. I would love to know how to plug it into a computer !!!!

 

[jaycat2692]

Re: 140 HP nightmare

i have replaced the powerpack already. the reason i had said the reeds is because ive heard the fuel spitting out of the front of carbs, indicates a bad reed. plus ive had a few four-wheelers that have acted kinda like this on a bad reed. thanks

 

[Okee Jimmy]

Re: 140 HP nightmare

Hi, does the timer base under the flywheel move when you advance the throttle? A stuck timer base will not allow the timing to advance, resulting poor performance at anything over an idle. Hope this helps, Jimmy.

 

[jaycat2692]

Re: 140 HP nightmare

Should i be able to move the base when its not running? ive never paid any attention to that and dont know, but ill check it out tomorow

 

[jonesg]

Re: 140 HP nightmare

It takes a heart of stone not to laugh.

You can get a peak reading voltmeter on ebay for $60.

 

[Rory140 V4]

Re: 140 HP nightmare

just putting it out there i just happen to have a boat named nightmare with a 1985 140 Johnson and has 120 on all four pots, spitting fuel out of the carbs could very well cause problems especially if it swallowed a reed.

 

[CharlieB]

Re: 140 HP nightmare

Get the DVA Meter and properly test the stator and triggers.

A weak high speed winding on the stator will NOT generate enough voltage to fire the ignition at mid to high RPM under load in the water, yet, it will make enough to rev in neutral.

Since there is NO RETURN on electrical parts, you GOT TO test and re-test to be sure of the problem part before spending $$$$$$.

 

[jaycat2692]

Re: 140 HP nightmare

I took the reed out today they all looked fine, seated good, stock metal ones but all looked in good shape. Its not just mid and high rpm, the motor runs like crap from every rpm in the water, even when in neutral its hard to get it to rev up. when it doe srev in neutral its does it very slowly, takes a bit to get any rpms. is there anyway to test the ohms on the stator and timmer base, since im assuming that all there is to check under flywheel, only to wires from there.