NO wot power i need a genious,a mircle, and a boat mechanic help please

[wefv]

Hi im new to posting hear. This forum has helped alot in the past , but now i have to ask a question i cant find the answer. I have a 140 evinrude 1984 it has eletric choke were it shoots fuel in the carb not the old fashion butterfly kind but enyways about 3 months ago i blew the motor now im 7 hours in breakin and i can and feel confident enough to go to wide open throtle but when i did it didn't have the power it should have. I went through the process of elimination i presed the choke and it took of it idles ok it just runs lean on top end and i dont wont to blow the motor and it has good fuel presure. Carbs have just been rebuilt during motor rebuild. I have tried pumping the ball while at wot and it does nothing, the only thing that helps is pressing the choke then its like i hit nitrous the carbs have been rebuilt fuel is clean and filter is to. All new gas hoses to. So what could cause the loss of power and runing lean at wot but not at lower speeds its hard to choke trim and steer at the same time please help im desperate and at my ends with this motor everything else checks good besides wot running i cant figure it out thanks... ohh and im still running double oil 25:1 could this magnifie the effect. thanks.

 

[wilde1j]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

Now how about another post in English, with punctuation, please!

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

I have instaled all new gas lines. Tank is venting as it should. It just runs lean at wot.

 

[Willyclay]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

Had the same problem with a 2004 Mercury 60HP carbed motor a couple years ago. Cleaned out the high speed jets (all three) and it was fixed. Good luck!

 

[ondarvr]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

You said the carbs were rebuilt. That means you completely disassembled them, soaked them in carb cleaner, cleaned every passage way and jet, blew out each passage way with air, adjusted the floats and then reassembled them with all new gaskets and floats....right?

There can still be an air leak in the fuel line, or air leaking past an intake gasket.

 

[F_R]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

Make sure the spark advance is going up against the full advance stop before the carburetor butterflies punch wide open.

Then go back to the carburetors and make sure the high speed jets (orifice plugs) are absolutely positivily shiny bright CLEAN!!!! If they are dirty and running lean, it might have been the cause of blowing the origional powerhead (???) Also make sure they are the RIGHT orifice plugs.

You did check the igniton timing, right?

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

I reused the floats. And yes the carbs are extremy clean i soaked them over night then used six cans of gumout I made sure it wasn't gona run lean and blow the motor. As for the blow up it had a lack of lubrication causing piston to expand scuffed up the piston skirts then the rings broke and bounced around at about 5000 rpms.. The oil side of the vro has been disabled since then and im mixing double oil in the tank. Thats why its so important to figure this out. I dont wont to blow it again. Any time im on plane besides the 3000 to 3700 rpm range i choke it to make sure it gets enough fuel then it will take off like a rocket.In the 3000 to around 3700 range if i choke it the motor will bog down Im asuming its flooding at this point. When i rebuilt the carbs i used new gaskets, oring, seat,and neddle. Thanks for all the help. I would think it was the highspeed orfices but the fuel filter is clean and i have all new hoses to.

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

I checked the timing as joe reeves said to and the armature is against the maximum advance stop when the buterflys are about 1/4 way open does this sound right?

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

Willyclay do u know if theres away to do a "quick cleaning" of the high speed orfices without taking it apart again? I dont think there cloged though. One orfice was replaced. It's one of the one's in the bowl it was replaced with one a little biger so if anything it should run rich right? I couldnt find a exact replacment so i got one alittle bigger

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

FR were are the high speed jets located in this carb? thanks everyone for all the help

 

[emdsapmgr]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

Sounds like you may have a lean condition. A couple of things to double check: During the carb cleaning, all of the passages in the carb need to be cleaned out with an aerosol carb cleaner. You need to pay attention when you spray thru each one, to the spray that comes out the other end. Compare that to the spray from the same orfice from the next carb. Repeat for each passage on each carb. One may have some dried fuel in one passage, restricting flow. All jets must be pulled and visually inspected for debris in them. I'd put the factory jets in all openings-if you have one oversize, it will overfuel and not run right-replace it with an original one per the parts catalog. The sinc and link needs to be redone on any overhauled engine. Esp check to be sure the carb butterflys are opening properly. You could have full spark advance with the butterflys not (open) level at full throttle. Pull the airbox cover, move the handle to full throttle and see if the butterflys are level in the carb throats. An air leak can cause lean conditions. When the engine is idling, spray some carb cleaner around the intake and carb gasketed surfaces. Also around the 4 intake side covers. Also, by the joint between the two crankcase halves where the gel seal is. If there is an air leak, the spray will get sucked into the crankcase, adding to the combustion and the rpms will increase-that indicates an air leak. When you are running at full speed, turn the engine off and pull the plugs out and check each one. Do they all look the same? is one wetter, dryer, blacker, whiter, etc. You are looking for differences. The high speed jets are the ones located behind the carb drain plugs in the side of the bottom carb bowls.

 

[Willyclay]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

You are getting excellent advice from several of the forum experts which I am not. While I have zero hands-on experience with your model motor and carbs, they appear similar to the Mercury I mentioned in that the high speed jets are accessible from the side of the float bowls and do not require removal or disassembly of the carbs. In my case with the Merc, we did not even remove the jets, just cleaned them in place. Good luck!

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

I did the carb cleaner test and if apray the cleaner directly down the carb barels it bogs down. The only leak i fount is at the throtle shafts and I had to realy get close and spray alot to make a difference then it boged a little.I also instaled clear fuel lines rheres no air bubles. So the carbs are deffinatly the problem.But how if they get cloged this easy im going to go crazy its only been 7 hours and the filter is clean. thanks for everyones help.

 

[Dhadley]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

OK, lets review - the motor originaly "blew" because there was a lack of lube. Translated that means it leaned out. Oil gets to the pistons in the fuel. If it wasn't getting enough fuel, it's not getting enough oil. Old carb parts were reused. Not a good indication of a professional clean and rebuild.

Now, the motor is still running lean unless you engage the primer. A classic sign of clogged carbs or incorrect float settings. If the carbs are clean and flowing the motor should bog within a second of the primer being engaged.

All this is assuming the skirt to wall clearances are correct, the timing is correct, the sync & link is correct and the correct spark plugs are being used. If the same person who "cleaned" the carbs rebuilt the motor then everything should be double checked before the rebuild process needs to be started all over again.

 

[ondarvr]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

7 hours can be forever in a carb, it only takes a minute for junk to re-plug a jet. Having a clean filter doesn't mean much either, many times what plugs the jet has formed in the carb from deposits left by the fuel.

I've cleaned a carb, had the motor run well for fifteen minutes and then start running poorly again, it was from not doing a good enough job in cleaning it the first time, although it looked very clean.

They need to be taken apart and checked again.

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

I reused the float thats it everything else is new. Could mis adjusting the float cause this? My manuel didnt exactly go over this in detail i just made sure it flowed when up right and stoped when upside down is that good enough? And yes the same person rebuilt the carbs that rebuilt the motor the motor is fine i know my ways around the internals i just never realy had to trouble shoot a problem like this.I guess ill pull the carbs and give"m a good doucing in some aresol gumout. Can any body tell me how to set the floats i dont think the floats are to blame if they were to low the fuel pump would still pump fuel in them before they got low enough to run lean right.

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

Im gona check fuel pressure at wot and if its good im gona tear down the carbs.

 

[wefv]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

ohh forgot to menchin it also will randomly surge when at wot dont know if this makes a difference or not

 

[Elbo]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

If it surges it could be a fireing prob.Mite try pulling each plug wire at idle to see if each one is hitting.One could be cold.or random fire.Its hard to tell on these motors.If it surges could be one of the cyliders kicking in.

 

[ondarvr]

Re: NO wot power i need a genious,a mircle, and a boat mechanic help please

ohh forgot to menchin it also will randomly surge when at wot dont know if this makes a difference or not

Check the fuel pump, it may be the problem with the surging, but running in this condition may cause a great deal of damage and require another rebuild, so you should check everything in the carb before running it again.