8 Hp Evinrude Wot Problem

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When I Run Wide Open The Boat Only Goes Half Speed (12 Jon Boat). But To Get More Out Of The Motor I Can Give It Half Primer And It Will Go A Little Faster. Just Rebuilt The Carb And It Ran Great For A Couple Days Until.......... Well Today. Also When It Is Running Correctly It Wont Run Worth A Darn With The Cowling On. Hope You Guys Can Help Me Thanks In Advance.

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

What year is the motor?

Sounds like it's getting too much fuel. Did you replace the float when you rebuilt the carb, did you put a carb kit in it?

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

Dont Know What Year Between 84 And 01 Im Assuming But There Is No Tag On Trans Clamp And Cant Find One On The Block. But I Think Your On To Something With The Too Much Fuel Because The Plugs Are Fouling Out. I Put In The Carb Repair Kit With New Float, Needle And Seat, And Gaskets And O-rings And Etc. Where Could I Find The Model Number On The Motor???

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

No numbers, sounds stolen, they are usually the first things to go to eliminate the chance of someone finding their motor (not saying it is) . Side of the transom clamp should be a plate with 2 little nuts holding it on or on the powerhead there is what looks like a frost plug with a number stamped into it. If you bought a kit for it how could you go into a dealership and tell them it is between a 1984 and 2001, there could be several kits between the years stated, my dealership would laugh at me and tell me to come back when I know what I have. An 84 for example has 3 different high speed jets that could work, a 1990 motor has an entirely different carb. I hope you saved the old parts. If I were you i'd clean the old main jet really well, get all the garbage out of it and reinstall it. Then you will know if you have the wrong jet and it will probably run better. Sounds like it's wrong, just a guess but it should do the trick, needle and float looks the same.

Cheers

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

Yea The Parts Guy Gave Me A Funny Look As Well But I Brought The Carb Into The Store And He Looked Up The Numbers Off The Carb. But Im Going To Go Out And Look At The Motor Now For The Numbers............. Hope It's Not Stolen Though

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

Ya I know the feeling to own something you may question, but whatever , it's moot point, point being it's yours

What was the number off the carb, that may help track down a better range in years. Just look at the jets, take the old and compare to the new, they are noticeably different if one is bigger than the other.

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

Number Off The Frost Plug Is B105181 And E8rcde......... By Jets Do You Mean Needle Seat........ Sorry If Im Difficult I Deal With Car Motors And Diesel Motors This Would Be My First Boat And Motor Just Trying To Fish Before Coast Guard In January...... Do You Still Need Carb Number?

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

It's an 86, lemme look at the parts, gimme a sec.

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

I Dont Recall Replacing Any Jets I Just Put All The New Stuff Where The Old Stuff Went And It Ran Fine For A Couple Hours And Then Started Having This Problem......... Motor Says 100/1 And Im Running 50/1 Is That A Problem?

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

Don't run 100:1, you were smart to run 50:1 especially if you've had this thing wide open, 100:1 will cause premature wear. If it were the wrong kit it would run bad out of the gate. Sounds like it's dirty, how did you clean it? Did you just replace the parts and that's it? These carbs have to be soaked in heavy duty carb cleaner over night, rinsed with water and then blown out with pressurized air from a compressor.

Many small passeges and small holes that won't get clean without this procedure.

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

Carb kit should have been omc part # 0398230

This carb has a high speed orifice , was it replaced with the kit, it's the newer style carb by the way with the plastic top, correct?

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

Well I Hosed It Down With Carb Cleaner And Blew Out With Pressurized Air But Didnt Soak It...... Looked Brand New When Taken Apart But The Needle Valve Seal Was Broken Up That Seemed To Be The Only Problem And I Could See Through Every Hole...... What Do You Suggest Im All Ears.... This Motor Is As Old As I Am 1986 What A Great Year

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

There are passages in that carb you can't see and the carb cleaner in the spray can won't get to where it needs to. First of all is the kit right?

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

The Carb Kit Package And All The Old Parts Are At My Shop So I'll Have To Check That Number Out Tomorrow..... And Yes It Has The Plastic Top.... I Dont Remember The Orifice In The Kit

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

I've never worked on one of these carbs but they are all similar in behavior, you aren't getting gas to the engine, something is up with the carb.

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

The Primer Bypasses The Carb Right? If So Then Something Has To Be Partially Jammed Or Clogged. Maybe One Of The Fuel Lines Are Deteriorating Or Something I Think Ill Soak It In Carb Cleaner Like You Said. Back Off For The 9th Time Then..... Would You Suggest Putting On A Inline Fuel Filter Or Is There Any Thing I Can Do To Help Prevent Like Seafoam?

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

Oh And When It Was Running Fine It Would Only Run Half Power At Wot With The Cowl On Any Ideas?

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

Yes I suspect like all other "primer" carbs the primer forces air through the circuit which forces gas into the carb or just straight gas from a gas feed. Fuel lines might be bad, have a good look to see if you can find what is holding it up, like you said it ran fine for a couple of days so if something is getting it you will find it. Seafoam can be added to your tank on a regular basis or ran once a year to decarb, either way its good practice. The square fuel pump on the side of the motor has a filter built in, remove the centre screw from it and remove the plastic part market "filter", there is a filter inside, check it as well to see if it is plugged up.

 

[bktheking]

Re: 8 Hp Evinrude Wot Problem

And if you took the cowl off it ran like it should? Again something isn't right. Have you checked for spark on both cylinders, these evinrudes will run like dogs if they aren't getting spark to both cylinders. If it did run right with it off then the air fuel mix is still an issue, my 9.9 will run identical with cowl on or off, same goes for my 9.5 and my 90.

 

[HEATEDHEAVY]

Re: 8 Hp Evinrude Wot Problem

yea when it ran good it would only run with the cowl off..... checked the fuel pump when i first got it but am def going to check it again. guess ill treat it like anything else and go down the list. will check for spark tomorrow though i know at least one has spark cause one of my buddies got a pretty good jolt from one of them lol