Rotax 503 Redrive Cog Removal

[ToddK]

I picked up a non provision 503 off a Rotec rally. I have removed the drive assembly, and and need to get the gog off of the crank. It seems to be held on by a large bolt. I am not sure what it has been torqued to, but I need to get it off.
Is there a procedure for removing and installing cog on the crank that somebody could point me to, or describe?
-Thanks

 

[bmcj]

 

[akwrencher]

 

[radfordc]

 

[BoKu]

 

[slevair]

 

[wakataka]

 

[nickjaxe]

 

[Armilite]

 

[grengsah82]

 

[Daleandee]