1953 Evinrude Lightwin 3hp wont run without choke

[Trollblazer]

Hi, Im realy stuck on this......I've done a carb rebuild with new float, plugs,wires,coils,points,condensers,leaf plate gaskets,2 head gaskets,inner flange gasket,exhaust manifold gaskets,I split the head open and resealed it,all joining surfaces were lapped,had the carb off and recleaned 8 times,cleaned the fuel tank,filter and line and this thing still seems to be pulling in air from some where!! I bought a manual on disc and it does'nt seem to have crank seals, just an oil slinger on top. I dont know what to do. It took me forever to get all the right parts for what i've done so far and no matter how much money and time I throw at this little motor It just wont run without the choke. Can anyone please help?!?

 

[crxess]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

2 test

1)Start with choke pulled. place palm of hand firmly over carb throat. Does it Stall? If so, probably no leaks.

2)Get a spray bottle and fill with pre-mix fuel.
Start motor with choke pulled.
Aim spray bottle at carb throat, open choke and spray fuel into carb. Does it try to rev up/idle? If so, you still have a fuel delivery problem.

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

Just thinkin,with the engine running with choke on, put your hand over the carb intake, does the engine stall because of lack of air? If it continues to run with hand on carb, you most likely do have an air leak. With choke on and engine running, take a can of carb cleaner and spray around the carb base, intake manifold any any other place you can think of, if you hit an air leak engine RPM will pick up.

 

[Trollblazer]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

well I've plugged the air silencer and felt no suction, so I took it off completely and plugged the carb throat and felt little suction but it didnt stall. I already spayed the whole thing down with carb cleaner when searching for a leak the first time and it stalled when I spayed the exhaust manifold cover plate , so thats got a new gasket now but why would it pull air in from the exhaust side of the cylinders? The pistons are lined up properly acording to the service manual. And what bugs me is why I cant find any info about crank seals on this particular motor, it has an oil slinger on top but its just metal, with no "O" ring or gasket and it doesnt seem to do anything. I dont understand why theres no seals. Could it be sucking in air from around the top and bottom of the crank shaft?

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

I will find a parts breakdown when I get to the shop and check out the crank seals and get back to you.

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

According to the parts breakdown, there are no crankshaft seals on your engine. There is an oil slinger on the crankshaft below the armature plate. Your engine also does not use roller bearings on the crank or rods. Make sure and use proper oil/gas ratio, I beleave it is 24/1.

What do you mean by , split the head and resealed it? Cylinder is a one piece item. You also said you used two head gaskets, the engine only uses one gasket.

When you overhauled your carb did you remove all jets , clean passages and blow out with compressed air? What about the expansion plug on the low speed circut, did you remove it and clean all passages? It sounds like you have a fuel delivery problem to me. Looking at the bore of your carb from the engine side do see some very small holes in the bore behind the throttle plate, are they clean?

 

[Trollblazer]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

what I meant was I've used to 2 head gaskets in all this testing and sealing and resealing, and my engine has a split type crankcase that doesnt use a gasket, it calls for a hardened sealer. When I was running it and shooting carb cleaner at it around the head it would stall in just about any spot so I got a gasket kit and did everyone of them and resealed the crankcase but now its the same story, it wont run without the choke and it still seems to be sucking air. When I did the carb over i removed the expansion plug and made sure the three jets where nice and clean, all the parts soaked in solvent for 24 hours and were blow out with compressed air, I dont think I've hacked anything so far, I have a manual and parts list, I just get the same results no matter what I do. Is this problem deeper than I think? Could the journal bearings be worn out or the crankshaft be bent? It seems to sound good when its running and I have about 75 pounds of compression on each cylinder. I just dont get it. I dont have the money to pay a shop to fix it, and I could easily pickup another motor for a fraction of what I'd pay to have it repaired. I just want this one to work......

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

Did you ever try squirting fuel mixture directly into carb, what happened?

 

[crxess]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

Dosen't make a lot of sense. If you seal the carb intake, it should loose the vacuum required to pull fuel.............Unless the leak is:
a) back of carb
b) internal to carb(cracked carb)

Sucking air at the case seam would kill fuel flow as it is no where near the carb.

 

[Trollblazer]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

alright guys I have today off and I will be doing some more testing, I will let you know how it goes, maybe I might have a fuel delivery problem, prior to tune up I did remove the tank,filter and line and clean,blow them all out. with the bowl off and fuel on I was getting a good flow of fuel, but I could be mistaken on how much is actually supposed to come out, anyway i''ll let you know.

 

[Trollblazer]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

the motor kicked right up when sprayed with fuel!!!! got it rev'n right up now!still had a hell of time adjusting the high and low speed jets, could only get it to go with the high speed on just about 6 and as soon as I crack the low speed it floods and dies

 

[Trollblazer]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

does anyone know how to adjust the carb on this thing??

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

Normally the static settings are, high speed, turn in until it seats, then out 1 turn. Low speed, turn in till it seats, then out 1 1/2 turns. Do not jam needles ito seat, turn in softly. It sounds like you still have a carb problem by the way you say you have the needles set. No low speed and 6 turns high speed.

 

[tx1961whaler]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

(Carburetor Adjustments - Two Adjustable N/Vs)
(J. Reeves)

Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns.

Setting the high and low needle valves properly:

NOTE: For engines that DO NOT have a shift selection, obviously there is no NEUTRAL position. Simply lower the rpms to the lowest setting to obtain the low speed needle va /lve adjustment.

(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. In segments of 1/8 turn, wating for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting.

(Low Speed) Slow the engine down to where it just stays running. Shift into neutral. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

 

[Elbo]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

I just posted the 65 evinrude above you.To run with the choke on your useing engine vaccum to pull fuel.I had the same problem.Ie needle not open enough.Open it a bit more and mine would flood.The guy at the shop where I get my parts stated he thinks the company don't want us fixing these old engines.I cannot set the float no matter what I do to it.It just will not seat.I'll bet if you raise the float a bit it will go the other way.Flooding.

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

There are a lot of those old motors running around my part of the country. The carbs can be trickey but when you get them right they run pretty good.

 

[Elbo]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

I wonder if they have any new parts in em. Also I wonder who is making them?

 

[Daviet]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

Lots of new parts, coils, points, condensers, water pumps, carb kits, gaskets there are enough parts available to practily rebuild the complete motor. Sierra makes a lot of after market parts.

 

[Elbo]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

I think I will order my parts from them.Thanks Elbo

 

[Trollblazer]

Re: 1953 Evinrude Lightwin 3hp wont run without choke

my needles are grooved from being seated to hard i'll have to sand them flat and try those adjustments, its not 6 turns out that i'm running at, its the numbers 6 on the knob of the high speed, about a half turn I think and as soon as I open the low speed it floods so would that indicate that my floats to high?