Evinrude lightwin won’t run

[silvab7232]

Hello, I just recently went through a 1956 Evinrude lightwin, Cleaned carb fully, new coils, new points gapped, new wires, new plugs. The motor has great spark, but it literally only runs for 1 or 2 seconds and dies out. The fuel flows fine from the shut off and into the carb, the fuel vent on the cap is open also. I even messed with the carb adjustments but I can’t figure it out. Any ideas? Thanks

[Mumbles]

Is that 1 or 2 seconds with the choke still out? It’s either flooding or running lean. Try richening the needle valves a bit.

[silvab7232]

I’ve been moving the choke in and out, and I have tried to richen the needle valves already, still just firing for a few seconds then cuts out, I even just swapped carbs

[chinewalker]

Do you have good flow or GOOD flow? The filters in the tanks are notorious for plugging up.

Also, the screen between the air horn and carb throat should be present.

[The Boat House]

• This reply was modified 3 years, 2 months ago by The Boat House.

[frankr]

Once the carb has filled it should run for a lot more than two seconds, even if it got no more flow from the tank. You probably have some problem other than carb/fuel. How’s the compression? Should be close to 80 psi.

[fleetwin]

OK, you have tried a different carb with the same results…Yes, fuel flow is often an issue for these engines, and I have been fooled/stumped by goo in the copper line as well. Is the engine new to you? Has is ever run OK for you? Like Frank says, time to go back to the basics starting with compression. Are you sure the fuel supply is clean and fresh? Any signs of water on the plugs? Perhaps you have a leaky/blown head gasket. Does it look like the intake manifold has been messed with? Reed problems are rare on these engines, unless someone has messed with them or screwed up the gaskets…

[silvab7232]

I will defintally check the compression next, also I will check the copper fuel line and the tank, I seemed to be getting decent flow from the tank to the carb. Everything else should be fine. But the compression I defintally need to check

[retiredoz]

plug wires crossed ? Broken reed ?

• This reply was modified 4 years, 9 months ago by retiredoz.

[jarheaddoc]

I may be way off base with this, but is it possible that the exhaust manifold is so plugged up that the exhaust gases can’t get pushed out?

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