RS50 won't turn off! Please Help!

[Oh-liver]

Ok here it is.

Just bought a RS125 and want to sell my Aprilia 50. However a very recent problem has just developed. When I turn the ignition off all the electrics turn off but the engine still runs! You can even rev it and drive off with the ignition off!

This doesn't happen every time but is extremely annoying. Trying to sell and makes it difficult.

Whats more is the bike has just had an £1100 top to bottom engine rebuild.

One idea I had was that the spark plug is somehow acting as a glow plug? Or is this just stupid.

Is there a simple solution aside from taking it to the Aprilia garage and bending over?

Many thanks for any replies,
Oliver
____________________
There are few things in life better than a motorcycle...

[Whosthedaddy]

Had a similar problem in my old mini.

The throttle cable was stuck or sticking and wouldn't stop when the ignition was turned off.

Check for fouling wires and give them a damn good lube and see whats what.
____________________
Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy

[hmmmnz]

normally when a car keeps going for a bit after the key has been turned off the timing is to far advanced. and is pre igniting.
who did your bottom end rebuild??
they should have put it back together at the right timing points but mabee they havnt.
what happens when you pull the spark plug lead off when its still running with the key off??
does it stop then??
if so then its a minor electrical problem,
if it still keeps going, then your timing is out
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Whosthedaddy]

[truslack]

This is one of the reasons that i DIDN'T buy the RS i was looking at, you had to stall it to stop
____________________
Current: Suzuki RG 125 Gamma, Honda H100, Triumph Tiger 800XC, Suzuki SV650 (minitwin)

[Evo]

EDIT:

Educated with below message.

Cheers G
____________________
Bikes owned
1989 VFR 400 RR NC30

[G]

2 stroke spark plugs can get fouled with (I believe) carbon deposits. These heat up from the riding to the point they are hot enough to ignite the fuel/air mixture. Often called 'dieseling' because it's working in a similar manner to a diesel.

When I've seen it on an old KTM 350 Enduro it would rev fairly uncontrollably - not great on a muddy surface when it makes a fair bit of power and torque.

As mentioned, if you pull the spark plug lead and it carries on, then this is the issue. Otherwise you're looking for an electric fault somewhere.

[Oh-liver]

hey all thanks for your help.

I did as you said and removed the lead to the spark plug and it killed it so I know the spark plug was acting as a glo plug.

I then checked for any electrical problems and found that there was a lose lead coming out of the main inginition switch. I took it apart and found that the wires were being held with some chewing gum like glue!

Chav before I had it probably did it. So i dissolved whatever it was with white sprirt and soldered the wires in place. Now works fine.

Anyway guys thx a lot for your help, it did indeed help.

Oliver
____________________
There are few things in life better than a motorcycle...

[Jamie S]

Glad you got it sorted , why do you think he had messed about with the wiring though?

[hmmmnz]

probaly had misplaced the key and thought he would hot wire it.
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Oh-liver]

Yeah must be
____________________
There are few things in life better than a motorcycle...