How do I get this off? 1970 speedway project

remove the bearing thats next to the sprocket and it will slide out when you install put the bearing on belt side install sprocket side first no bearing after install bearing and then snap ring
This would be a 71 or 72 frame maybe 73 can't be a 1970 speedway didn't have green 1970 post a picture of the whole thing I'll identify the bike model year and some info on it