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447 runs but dies under 3-4000 rpm

  • Ranchfly103
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4 months 2 weeks ago #19373 by Ranchfly103
447 runs but dies under 3-4000 rpm was created by Ranchfly103
Any ideas?

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4 months 2 weeks ago #19374 by Ranchfly103
Replied by Ranchfly103 on topic 447 runs but dies under 3-4000 rpm
It will not idle.

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  • Bill Hertzel
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4 months 2 weeks ago #19377 by Bill Hertzel
Replied by Bill Hertzel on topic 447 runs but dies under 3-4000 rpm
A wild guess would be that there is a problem with the Idle circuit ports.
Try cleaning the carb.

Look in the Float Bowl first.
If it has any debris, you are on the right track.

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4 months 2 weeks ago #19378 by Dennisr5
Replied by Dennisr5 on topic 447 runs but dies under 3-4000 rpm
The first thing I would do is clean the carb/carbs, in particular the idle jet and idle circuits.

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4 months 2 weeks ago #19380 by kiwiatd
Replied by kiwiatd on topic 447 runs but dies under 3-4000 rpm
Make sure you are running 50:1 ratio.
We had a bloke at our airfield that thought 40:1 would be safer but it wouldn't idle, we changed his fuel with the correct ratio and it idled fine.

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4 months 6 days ago #19437 by Ranchfly103
Replied by Ranchfly103 on topic 447 runs but dies under 3-4000 rpm
Drained the tank and replaced with fresh 50:1 fuel. Disassembled carberator twice and cleaned it. Still no luck...

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4 months 6 days ago - 4 months 6 days ago #19439 by kiwiatd
Replied by kiwiatd on topic 447 runs but dies under 3-4000 rpm
You have the needle below the white cup
Last edit: 4 months 6 days ago by kiwiatd. Reason: Incorrect word

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4 months 5 days ago #19453 by Ranchfly103
Replied by Ranchfly103 on topic 447 runs but dies under 3-4000 rpm
Yes, needle and clip were put in before the white cup.

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4 months 5 days ago #19454 by kiwiatd
Replied by kiwiatd on topic 447 runs but dies under 3-4000 rpm
What happens if you leave the choke on?

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4 months 4 days ago #19468 by Ranchfly103
Replied by Ranchfly103 on topic 447 runs but dies under 3-4000 rpm
Seemed to run a little longer with choke on throttle all the way off

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4 months 4 days ago #19469 by Dennisr5
Replied by Dennisr5 on topic 447 runs but dies under 3-4000 rpm
Definitely sounds like a fault with the idle circuit. Is the idle jet the correct one? Were there any faults found when you removed it to clean?

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3 months 4 weeks ago #19503 by Ranchfly103
Replied by Ranchfly103 on topic 447 runs but dies under 3-4000 rpm
It ran fine and idled fine, then one day it didn't. I don't understand what it was that changed that.

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3 months 4 weeks ago #19513 by Dennisr5
Replied by Dennisr5 on topic 447 runs but dies under 3-4000 rpm
You have not provided much information to go on so I will just offer a couple of suggestions.
The first thing I would do is remove the intake and exhaust manifolds. This will allow an inspection of the pistons, rings and cylinders. With the intake manifold off you can ensure there are no intake leaks. Looking in the ports will give you a view of the pistons, rings and cylinder walls. If no problem has been found so far then I would go through the ignition. If this is a point Ignition system it needs regular maintenance anyway. It is quite possible that you are dropping one cylinder at lower rpm because of a scuffed cylinder, stuck rings or an ignition out of spec, resulting in a no idle situation.

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  • Bill Hertzel
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3 months 3 weeks ago #19523 by Bill Hertzel
Replied by Bill Hertzel on topic 447 runs but dies under 3-4000 rpm
Prepare a small bottle of gas that you can use to squirt fuel into the carb.
A can of Starting Fluid will serve the same purpose.

Start the engine and then throttle back to where it wants to stop.
Squirt some Gas/Fluid into the Carb throat.
If it comes back to life, it is a fuel and not an electrical or compression problem.

If it dies, add some Oil to the gas in the Bottle at 5 or10:1. Essentially thin the Oil to make it squirtable.
If the Oil mix brings it back to life: Suspect a compression problem.
Expect a lot of smoke for a few seconds.

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