447 runs but dies under 3-4000 rpm
in 2 Stroke Technical Questions
7 years ago
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Re: 447 runs but dies under 3-4000 rpm
by Joel Winter » 7 years ago
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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Re: 447 runs but dies under 3-4000 rpm
by Dennis Richardson » 7 years ago
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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Re: 447 runs but dies under 3-4000 rpm
by Bill Hertzel » 7 years ago
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.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
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