Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

[Herb24]

Hi everyone and thanks in advance for your wonderful advice!

I picked up this Evinrude Ski Twin 33 with electric start a month ago. After cleaning the points and replacing spark plugs i managed to get it to run, so we took it to the lake and went for a spin. It seemed to run ok at low speed and idle was a little shakey but better after the engine warmed up. it seemed to run well WOT as weel abut after 3 to 5 minutes WOT it would start losing power and shortly it would be running at what seemed like a high idle in gear evin with WOT. we played with the high and low speed mixture settings and tried a few things but came to the conclusion that a carb rebuild was in order.

All of that tells me that this motor should run reasonably well with a tune up.

I proceeded to
-Replace all coils, points, condensors. and set gap to roughly 0.02" using a business card.
-replaced fuel pump with new one from my dealer.
-rebuilt carb with the evinrude carb repair kit. (new gaskets, float seat & valve, new boss gasket and put it all back together)
-new lower unit gear oil

now getting the engine back in the water it will run with the throttle lever in the start position, but i cant go to low speed or it will stall quickly, I can push it up to high speed although it doesnt seem like the RPM we had before the tune up.

Originally I had the carburetor float set to (high?) as it was flooding badly, so adjusted the float and now the fuel line bulb gets firm instead of spewing gas into the throat of the carb. However i still dont see much of an improvement if any.
if I put my hand over half of the throat of the carb the engine will stall quickly. needles are back out to manufactures specifications. My float is not set the way the manual shows tho, otherwise i just flood.

not sure what do to.
cant idle, not much rpm at wot, (in neutral) and adjusting needles rich or lean doesnt seem to help, anyting i do seems to stall the engine.


your help is apprecieated I'd love to get this running smooth and feels like i should be close, were going campin on the 27th for the weekend and want to take theboat.

 

[buddhapi]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

well, your primer bulb should get hard, and fuel should not spew into the carb. the needle should set in the seat once the bowl is full of fuel. now, being that your motor dies when you shut off the majority of the air with your hand, is telling me that you don't have an air leak around your reed plate gaskets. pull the carb off and adjust the float as your manual suggests and you should be getting enough fuel for your motor to run. make sure the needle and seat are clean and seal 100% with the float slightly lower than level, with the carb sitting right side up.

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Thanks for the input Buddhapi,

I will keep working on the float setting, keeping in mind that the float should be just below level when the needle is seated snug. Man I wish i hadn't been so quick to toss out the old carburetor parts.

Live and Learn,

Damn this rain, its always something. Work, the wife, the weather. so hard to get things done lol.

 

[lindy46]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Did you remove the welch plug from the top of the carb and clean the idle circuit underneath?

 

[HighTrim]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Im also not overly confident in the way that the points were set. Business card stock is great for cleaning the points with acetone, not sure I would use them to set the points.

Buy a cheap feeler gauge from princess auto. Set them so 020 fits through snug, 022 wont pass, and 018 slides through with no resistance. Then clean with business card dipped in acetone.

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Thanks Lindy & High Trim, I will pick up a feeler guage.

Just popped the welch cap and everything looks very clean, i will proceed to give it a blast with carb cleaner just in case.

Can anyone see anything horribly wrong in these photos? the manual states that with the carb upside down the top of the float should be even with the rim of the casting. I believe I have acoomplished as you see in the photos, but with the float set as it is, the carb is just overflowing and fuel runs right out of the throat, i could squeze the primer bulb all day, the needle is not seating with this float setting. should i work my way down until the needle will seat? will that throw the amount of fuel/air out of whack?

 

[HighTrim]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Is that high speed nozzle gasket new?

I always set my float so that the unhinged end is just SLIGHTLY higher than the hinged end, that way you ensure the needle seats.

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

the high speed nozzle gasket is new.

I will try that with the float and see if it helps. I think I've been over tightening the screws when rebuilding the carb because i've split the new gasket between the bowl and upper half.

looks like im buying another rebuild kit

live and learn!

thanks for the tips, keep em' coming. Ill post back tomorrow night (hopefully with good news)

 

[HighTrim]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Easy Hercules! lol

You can buy the items separately.

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

I went to my dealer and picked up another gasket, took me two tries to get the float set properly and now the primer bulb gets solid hard once the bowl fills up. YAY!

tomorrow night re-set the points with my new feeler guage, (thanks for the tip, Princess auto had them) and see what happens on the lake. Hopefully good news to follow, otherwise I'll be looking at ignition timing i would guess.

There would be no way to wire up a tachometer for my dashboard to an outboard motor would there? Im working on restoring my 14' aluminum runabout and it will have all electrical system, speedometer, compass, new switches and maybe a tach? if not, Princess Auto has on "clearance" for $20 digital laser tachometers. I could use if needed for getting the motor running just right.

 

[kfa4303]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Hi Herb. The carb looks ok to me based on the pics you posted. Actually, you can wire up a tachometer using a neat little gizmo called a "Tiny Tach" it's a super simple device with a wire that you wrap around one of your spark plug leads. No cuts, splices, or new wiring. It then displays your rpms on a small LED screen that comes with it. You can either mount it on the motor, or the dash. Do a search on youtube to see some in action. Good luck on the sea trial tomorrow. Here are some great link to help you dial in the ignition and rebuild the carb too.

3 HP Evinrude Lightwin Ignition System Tune-Up 1952-1967

5.5 HP Evinrude Johnson 1954-1954 Carburetor Tune-Up Procedure

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Bad news,

I had the boat down at the launch today, before launching i gave one last check of all wiring connections and nuts/bolts etc. are all tight. I squeeze the fuel bulb a few times and have a look at the carb only to find. There is a crack in the bowl and leaking fuel!

looks like a new bowl is required, I will order from my local dealer or online, but i plan to seal the crack and test the engine in the meantime. I'm in need of some re-assurance that this will go with a good carb. hoping to get that with a temporarily repaired bowl. Its been a long time since ive seen this motor run proper.

 

[kfa4303]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

It's always something :/ but at least you know where the gas leak is.

 

[buddhapi]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

I also agree that the float setting look's mint. sorry to hear the bowl is cracked. let us know how she runs out. I'm hoping to test run my 1974 40hp Evinrude tomorrow, after coming to me as a (PILE)

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Good luck with your test run buddhapi!

I am going through a lot of what i hope is just the learning curve, and that crucial ice breaking experience. I imagine that one will get a feel for this stuff eventually and it becomes much simpler for someone with a little experience. Same as me with working on natural gas or propane fired furnaces and heaters.

anyway, i have the crack sealed up with some marine GOOP. Yes it dissolves with extended exposure to gasoline, but all I really want with this cracked bowl is for it to hold togerther long enough that i can see if theres more to tackle on this engine. (hopefully nothing and she runs smooth now).

 

[HighTrim]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Im not sure what a dealer would charge you for a new bowl! I likely have some good used ones laying around I could help out with. Ill be going to a meet in your area this weekend.

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Where's the meet? I'd like to check it out. You see the picture of the bowl on this thread. If you have one I'd be interested .

 

[HighTrim]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

It is a Maple Leaf Chapter of the AOMCI Meet north of Ajax near Port Perry. Always good for parts!

 

[Herb24]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

I didn't make it out to the meet. But I did order a new float bowl at marineengine.com. It cost me less than gas would have to get to the meet. Hopefully there is not a huge duty or tariff to pay when it crosses the border to Canada.

 

[kfa4303]

Re: Evinrude Ski twin 33 (1966) barely runs after carb rebuild etc.

Hi Herb24 (love the name btw). Here's a great carb rebuild link. It's for a slightly different model, but all of the steps are the same for your motor and it has lots of handy pics.

5.5 HP Evinrude Johnson 1954-1954 Carburetor Tune-Up Procedure