Ticking over when switched off?? HELP

[bass2k8]

Right, so you should probably know that I've got a Peugeot Speedfight 2 100 Prost.

Recently I've noticed that once I've gone for a ride and then go to park up, I turn the ignition off and my scooter stays ticking over for a couple of seconds and then goes off.

I don't know why its doing this, but the other week I dropped my scooter on its side and it had some petrol leaked on the floor. I could not find where it came from. So that could be the cause of the problem?

Could you please advise what I should do for checks etc, Thanks.
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Peugeot Speedfight 2 100 Prost, 01 Plate, 2000 model.

[The Artist]

By "stays ticking over" do you mean the engine continues to run or sits there ticking?

[bass2k8]

Well I don't really know the difference between the two lol... but it sounds the same as if I have just turned it on and left it on idle.
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Peugeot Speedfight 2 100 Prost, 01 Plate, 2000 model.

[The Artist]

I can't really work out what is happening without a proper description or a video or something.

Most bikes will go tick tick tick after a ride because they are hot and that is the sound of the metal contracting.

If the engine continues to run for a few seconds then cuts out, either your bike has a really weird way of cutting the ignition or you haven't told the full story.

A video would be best.

[bass2k8]

I will try and film a video later on in the day, I've got to pop out now so I will keep you posted. Thanks.
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Peugeot Speedfight 2 100 Prost, 01 Plate, 2000 model.

[Kickstart]

Hi

Running on like that used to be fairly common with old engines. Build up of carbon in the engine which got nice and hot and acted as a glow plug igniting the fuel / air even when the ignition wasn't firing. Does still require fuel and air, but a basic carb doesn't care whether the ignition is on or not.

However pretty rare these days.

First thing is check the spark plug and see how dirty that is.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[weasley]

What Kickstart said.

It is also something you want to sort out ASAP - uncontrolled combustion like this can be very damaging to the plug, pistons, bore etc so you really don't want it happening. It might just be a fouled plug, but it could also be deposits on the piston or cylinder head needing a decoke.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[The Artist]

If it is what kickstart said, it could be running lean meaning it gets so hot the plug ignites the fuel just from being hot.

[Kickstart]

Hi

Would expect it to do engine damage before it got that lean and hot, or just melt the plug.

I would be more inclined to suspect it is seriously rich, possibly from the choke mechanism jamming on when it was dropped. Rich mix will mean a build up or carbon.

Checking the plug is the easiest way to have some idea. Might well need a decoke though.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[bass2k8]

[The Artist]

https://www.v6z24.com/mods/howto/images/plugs/plugs19.jpg

[bass2k8]

[heehaw]

Most likely to be red hot carbon igniting the fuel, it's called dieseling.

Alternatively its the contacts on your ignition switch or relay sticking, WD:40 or contact spray.
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Its important, otherwise it wouldn't be there.

Retro Rider Bicycles: CB125TDC, CBR400RR, BSA Bantam.

[SpannerMonkey]

Not having much luck with the speedfight are ya lad... =/
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

[bass2k8]

[SpannerMonkey]

[Walloper]

2000 year scooter may possibly need a De-coke.
It is defo an engine heat related problem.

The oil control ring of the piston and or the cylinder bore wear which allows too much oil to remain on the bore. This gets 'partially' burned-off during combustion but leaves heavy deposits.
As this continues it can build up a thick layer.
It can even be thick enough to increase compression ratio which will add to the problem of 'running-on'.

If it's a two-stroke too much oil in the mix can do the same thing.

As said, check the plug first. It can indicate if the cylinder is healthy or not.

There is a way to 'sort-of' de-coke without disassembly.
It needs a bottle of Redex and a small tube to feed the Redex into the venturi via a vacuum port.
It will maybe remove some of the soot and s4it but ultimately it may require stripping.
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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[bass2k8]

[SpannerMonkey]

[bass2k8]

[bass2k8]

[SpannerMonkey]

[bass2k8]

[lukamon]

When oil burns in your engine (the 2 stroke oil you put in te tank) it leave a kind of black grime, soot basically.over time this can build up inside your engine.

Now imagine this soot has built up into a lump of black crap in the engine. When petrol is burnt, it burns at 600deg c (i think) and this.Will make your.little lump of black crap glow.red hot.

Obviously when your pour petrol onto anything red hot, its gonna catch fire. Since the carb in your bike is mechanical, not.electrical, it doesnt stop working when you turn the key but Will keep putting fuel into the.engine if it is turning. The spark having been turned off by the key, petrol is now being ignited by your little lump of red - hot black crap. Since the engine Will be turning slower, it won't burn enough petrol to keep the carbon red hot.and Will eventually cool down and stop burning petrol and the engine Will stop.

/breath
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killa wrote: Im an ass man myself

[Kickstart]