Over revving in nuteral - 2003 Yamaha YZ 125

It appears to be a known problem.

Try cleaning the Throttle Body, plus there are some ideas in the link.

https://www.google.com/search?q=2003+Fiat+Palio+1.2%2C+High+Revving+up+and+down

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if it won't start in park but you can start it in nuteral it could be the park nuteral switch on the tranny

do you have acess to a scanner to see if park neutral switch is showing correct gear?

If battery connections are sound , try the inhibitor switch (Nuteral selector Sw on gearbox) ie Car must be in nuteral before engine will crank. You can slightly rock gear selector but be CAREFUL ! do not select drive.

BROWN = PHASE BLUE = NEUTRAL.
European code.
BROWN = BLACK WHITE = BLUE

sounds like you have a worn or bad synchronizer.by the way if you have either the freelander or the discovery; there are 3 recalls on each model.

What is the problem? Auto or stick?

tranny gears gone get new tranny

park and lock cable is out adjustment.

check your starter relay if that isnt it then it is either the starter or the nuteral saftey switch