Engine will not shut off once keys removed from ignition!

[ManicGTI]

Firstly, hi all, first post!

1986 Vision NE 50 MF, Not a spree i'm afraid, but I believe it's pretty much identical!

It hasn't been run in 6 years so I cleaned the carb, tank out etc and have got it started, but when I turn it off and remove the key it keeps on running for a minute or so and eventually dies!

I have added an inline filter sitting vertically in the fuel line from tank to carb as I found some debris in tank when I cleaned it out. Could it be residual fuel in this that is keeping it going?

Dave

[uspmale]

Unless the cylinder is really car boned up, I suspect your ignition switch is bad or shorted.
Pull the switch off and check with a multi-meter.

[ManicGTI]

Thanks, i'll check the ignition switch.

Would a carboned up piston cause the same problem then?

I'm a car man normally, 2 strokes are new to me

Dave

[uspmale]

Yea, hot spots created by the carbon build up can fire unburnt fuel.
If the swich checks out OK, then pull the head and look for carbon deposits.

[DrZ34]

Yea, hot spots created by the carbon build up can fire unburnt fuel.
If the swich checks out OK, then pull the head and look for carbon deposits.

Also known as " deiseling", sometimes acompanyed with running backwards

[ManicGTI]

update...When I pull a spade off the coil, it does die out.

Assume this implies ignition problem?

[uspmale]

Yes, you just eliminated the spark.
Your switch is stuck in the on position.
Probably you will have to change it out.

[ManicGTI]

Sorted

Geen wire had broken on back of Ignition. Resoldered them all for peace of mind.

Now Runs and stops fine, thanks for the tips!

Onto the next problem...leaking carb