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Burntime

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Burntime

I put a known 20hp vanguard to replace the blown 20hp. It is all in and no pop or anything. I have good spark. I put ether in the carb and still nothing. The fuel pump is pumping. It does turn over. I have no idea? Any ideas? It is a vertical shaft motor.

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Burntime

Motor ran like a top when pulled. It is low hours, like 100 hours. I can hear the carb clicking. Oil level is correct, I even pulled the plugs to make sure the cylinders did not fill with oil being tipped. This is also the same oil sentinel on the motor when it ran perfectly. It is also fully wired up.

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simple_stan

Do you have good vacuum at the carb when cranking? I had a young man working for me that removed a carb and stuffed a rag in the intake to prevent debris from falling in. The rag didn't get removed, the engine wouldn't start. Just a thought.

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Burntime

Flywheel was removed and put back on. I am not even getting a backfire or pop. Nothing even close. Key is in place. I even sprayed ether in the carb and not so much as a cough. I know I have good spark...

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Brettw

Sounds like a compression issue? With fuel and spark, it should do something. You say you have good spark. Via a spark tester? Are you sure you have good plugs? Lastly, dump a bit of fuel right into the air filter intake. If you have spark, and fuel, it would seem to me to be a compression issue. Timing completely off or valves stuck open. Hard to believe you would have issues on BOTH cylinders, so my thought might be timing? Attempting to fire when valves are still open?

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cityboy2977

if you pull a plug and shoot it with ether/gas, it WILL fire if spark is good. it has no choice.

if it doesnt then i would triple check spark. then work my way backwards to plugs, fuel, wiring, and like mentioned, timing.

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rfsmith1952

Gas-fouled plugs, particularly Autolites, sometimes will not spark. You may have gas-fouled them from repeated starting attempts. I've seen guys clean them by setting them on fire to burn off the gas, but I just get new plugs.

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Ronald Hribar

I think the wiring was the same on the two motors.

And you just had to put everything together plug and play.

and you can see fuel up to carb.

only thing left is to check for compression with a guage

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cityboy2977

if the motor ran nice before you dropped er in im gonna go with something very simple that has been over looked. obviously you have had time to walk away, which is sometimes mandatory in order to get the head right.

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