Originally Posted by Technocyclist
Try this freewheel:
But I think you might have to modify your 48 teeth sprocket to fit the freewheel. Probably just drill 4 holes to match the freewheel.
Now I've seen that freewheel before online.....
Does that freewheel go on the LEFT side of the wheel? That 4-hole pattern is common and easy to get go-kart sprockets for, however I'm sure that is for a right-side wheel sprocket.