if you dont have an impact the strap wrench works great as X noted.
if you dont have a strap wrench use the belt itself with a prybar wrapped in it for leverage.
dont use a flywheel fin.
the stock sprocket is self-keyed.
you can go either way but self keyed is easier to deal with.
be careful what you buy; the stock yerf sprocket is very narrow; mine's out and i can measure the hub if you like.
the 8 tooth i changed to on mine needed the sprocket hubs narrowed to fit.
ps: stock yerfs are spec'd, to my knowledge, at 10 teeth.
mine had a 9 tooth in it; i dont know if it was stock or not but you should count yours before ordering so you dont make the same mistake i did and waste $ buying what ya already had.
that said, i have a brand new 9 for sale if you dont mind grinding the hubs down to fit.
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