Third time I've experienced this, when I start the ski up in the driveway to flush it out, it revs up uncontrolably. The RPMs just ramp up, turned gas off,kill switch had no effect, pulling lanyard had no effect! Finally the gas being off, shuts it down...WTF!!! Has never done this in the water and always runs fine when we're out on it. It's the 720cc 2 stroke. I've heard of 2 strokes doing this when the gas is turned off? Turning the gas off was the only thing that finally shut it down. Anybody?? Any Ideas??
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'00Gti,high revving when flushing,pulling lanyard DIDNOT KILL IT!!
- Thread starter Tredski
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cdnbikerdude
Member
You are probably running lean. If you pull the choke (and hold it out) it will stop the engine next time, but you should probably take your carbs off and clean them. Do you still have the old grey fuel lines as well?
On 2 strokes it's possible to experience Dieseling when running under certain conditions. From wiki: Dieseling or engine run-on is a condition which can occur in spark plug gasoline powered internal combustion engines whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark. Dieseling is so-named because it is similar in appearance to how diesel engines operate, by firing without a spark. However the ignition source in a diesel is the compression of the gas in the cylinder, while in the dieseling phenomenon the compression ratio is not sufficient to ignite the fuel and it is a hot spot inside the cylinder that starts combustion.
On 2 strokes it's possible to experience Dieseling when running under certain conditions. From wiki: Dieseling or engine run-on is a condition which can occur in spark plug gasoline powered internal combustion engines whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark. Dieseling is so-named because it is similar in appearance to how diesel engines operate, by firing without a spark. However the ignition source in a diesel is the compression of the gas in the cylinder, while in the dieseling phenomenon the compression ratio is not sufficient to ignite the fuel and it is a hot spot inside the cylinder that starts combustion.
cut'n ride
New Member
You may also have a leak in the intake somewhere that is causing a lean condition. A good way to test for this is to spray some carb cleaner on the intake and around the gaskets while the ski is running. If you detect a surge or increase in rpms, that is your problem.
Run away engine.....
I have read a chapter in the manual that describes your problem as a runaway engine. The problem is, I read this about a year ago and can't seem to locate this chapter. When I come across it, I'll try and post more information on it. I do remember, that it's caused by a lack of torque on the impeller and revving the motor. Without that torque, the engine has no way of slowing itself down and will continue to speed up. It's not good on the enigne.
There is also the possibility that the engine is running backwards. If this happens, it has to be stopped by choking the enigne. This is part of the dieseling effect............:cheers:
I have read a chapter in the manual that describes your problem as a runaway engine. The problem is, I read this about a year ago and can't seem to locate this chapter. When I come across it, I'll try and post more information on it. I do remember, that it's caused by a lack of torque on the impeller and revving the motor. Without that torque, the engine has no way of slowing itself down and will continue to speed up. It's not good on the enigne.
There is also the possibility that the engine is running backwards. If this happens, it has to be stopped by choking the enigne. This is part of the dieseling effect............:cheers:
This problem is similar to the effect the RC (Radio Control) engines use to operate running on Nitro Methane fuel. They use a glow plug heated by a battery charge and when it gets hot enough the engine fires the fuel and runs the engine...with no spark plug. I own 2 such nitro monster trucks. Lots of info at www.traxxas.com, concerning RC vehicles...but what you are encountering is a "hot engine" or "hot spots" that are firing the fuel left in the combustion chamber...just choke the engine and it will shut down from over flooding of fuel, and an over rich mixture that "chokes" out the engine. It isn't a good thing to let this happen and run away with the rpm.s as a over heat condition could occur.
Karl
Karl
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