RPM suddenly increase at neutral gear.

[Sky99]

Just ride my bike after bookout this morning...

 

Starting still okay, after 10mins of ride, put bike on neutral at traffic light, my rpm can go up go 5k.. why is that so? Riding 125z

[BikedynamicCentre]

maybe ur calpator mayb it have slight jam go to the workshop and check it out

[Hydher]

Clutch plate worn.

[Raptor]

Carb jetting problem.

 

Idle fuel mixture screw needs to be adjusted that's all.

 

I race a Y125Z at Tuas and Pasir Gudang... I kena this kind of thing before too.

[Sky99]

Carb jetting problem.

 

Idle fuel mixture screw needs to be adjusted that's all.

 

I race a Y125Z at Tuas and Pasir Gudang... I kena this kind of thing before too.

 

Big problem if not fixed?

[Phang]

My vote:-

 

Throttle cable stuck

[tionghan]

yap.. but mine happened only when i turn my handle.. scared the hell outta me

My vote:-

 

Throttle cable stuck

[PepperCrab]

Used to ride dirt bikes and we get this all the time. But this might not be your problem since you said the RPM went up by itself.

 

In my case the RPM doesn't come down after you close the throttle. In my case the carb slide return spring was weak, and the slide itself needed to be changed because it wasn't sliding smoothly.

[Raptor]

yap.. but mine happened only when i turn my handle.. scared the hell outta me

 

Means that your throttle cable has not enough play.

[Raptor]

Big problem if not fixed?

 

Not a big problem... more or less an irritating problem... rpm very high at traffic light, other road users will think you trying to be funny.

[crazydj]

Magnetic coil. I got this before when my magnetic coil spoil.

[Sky99]

Not a big problem... more or less an irritating problem... rpm very high at traffic light, other road users will think you trying to be funny.

 

Will it be v expensive to fix it? Intend to fix it soon..

[Sky99]

Not a big problem... more or less an irritating problem... rpm very high at traffic light, other road users will think you trying to be funny.

 

Will it be v expensive to fix it? Intend to fix it soon..

[Raptor]

Will it be v expensive to fix it? Intend to fix it soon..

 

Service the carb and rejet.

 

I honestly dun know how much they charge coz I work mostly on DRZs.

[bustop]

yap.. but mine happened only when i turn my handle.. scared the hell outta me

 

Bro, if u turn handle bar the idling auto go up it's your throttle cable.

 

125z

[unsuitable90]

if the rpm goes up by itself, you need to be careful, because the 125z that you are on is HAUNTEDD...

[ben1112]

Gasket leak between head and block. Causing lean A/F. If u blip the throttle and the rpm raises and drops to below the idle point den finally rests at the idle point prob means wrong a/f. Proper should be just come to a rest at idle from blip.