How to remove the front sprocket?

[CR-For-Ever]

Heya,

I'm trying to replace my front sprocket but everytime I try and move the bolt the wheel turns I had my brother hold the brake pedal down but it still moves, anyone have tips or tricks on this?

btw it's a 2000 CR125.

Thanks,
Later

 

[magneto]

Use an electric or air operated impact wrench.

 

[TShain]

Hit the wrench with a hammer?

 

[hrc125rider]

impact gun

 

[crf450guy]

put a metal bar thru the sprocket so it hits the swingarm when the wheel tries to turn........or put a piece of rope in the spark plug hole it will bunch up and stop the engine from turning over(i do this on cars all the time)

 

[Foxpilot]

I just stuck an extra wrench through one of the teeth, held it tight with one hand and pressed it onto the case on the opposite side, then just turn the nut with your socket wrench in the other hand.