St2 revving up to 10000rpm by itself

[Campbell83]

Hi all have had an issue with this bike for 4 years now. It has been to 6 diff bike shops including ducati sspecialist and still can't be fixed. Ok detail bike is ducati st2 97 model. Problem I'm having is bike starts fine and idles fine. Revs upto 2500 rpm fine then once you go over 2500 rpm it jumps to 10000rpm by itself without moving throttle. It then comes back to idle. Very scary to ride when it happened. So far iv been told it's valves so had them done then told it was low on compression, don't no how this would make it free rev. Any advice would be great.

[cb4265]

Has to be electrical rather than mechanical doesn't it?

I didn't know they would rev that hard, bloody impressive really!

How do you knock the revs back when it revs to 10k by itself?

Craig

[Campbell83]

Hi the revs drop back down by itself but is slow then as soon as you rev it to 2500 rpm it does it again. Im also thinking electrical. When it happened I was riding back from a trip had done about 200 kms then it started doin this. I'm thinking computer but don't want to waste more money until it can be verified as iv spent 7 grand so far for the same results

[Puffin64]

Is your ECU chipped? if so could you put back the original chip?
I'm sure it's the ECU, your best bet would be to buy a cheap one off ebay or a bike breakers parting out one.

[latte committee]

Motorcycles are by nature ,,,,,, FEMALE

Your ST2 has obviously had a dummy spit at being upstaged by the later model, faster woman (ST3), that you've introduced to garage.

"She's" only revving to 10 grand to remind you that she's still got what it takes, and like most females ,,, does it randomly, and when you least expect it.

[Campbell83]

Hi no ecu is not chipped. I was thinking ecu but not sure. So can I just put a chip in it

[Campbell83]

So true about the female lol

[latte committee]

On a more serious note .........

The cause HAS to be an electrical influence upon FUELING.

An engine does not rev on electricity alone.
The only thing that increases engine RPM is additional fuel/air mixture.
Which it gets via information input to the ECU from other sensors, which inturn results in greater fuel delivery.

If it got only additional fuel, but no additional air/oxygen, then it would flood, wet the plugs, and stop.

So I'd be looking at -
TPS
Throttle bodies
Air bleeds.

It's gotta get a HEAP more Air/Fuel, in the correct proportions to rev to 10 grand.
10 grands worth of fuel, without 10 grands worth of air, will only flood the engine, NOT increase it's output (revs).

Go looking for things that have a causal relationship to both requirements.

[Campbell83]

Ok I'll check tps now once I work out how and let you no

[Bill_Anderson]

No governor on the ST2? I don't think an ST4/4s or ST3/3s could make it up to 10,000 rpm as the governor would kick in.