I have heard of several recoil starters breaking on the HS engine. I found this in the Honda GHX50 manual and it may apply to the HS engine as it is supposed to be a clone of the Honda. Hope this helps.
NOTICE: Do not allow the starter grip to snap back against the engine. Return it gently to prevent damage to the starter........ unless you're not holding on tight and it kicks back and rips it outta yer hand!!!