i have a 89 evo its a stroker ihad for 16 years never much trouble anyway its not running right starts hard sometimes and when i shut it down some time it sounds like somthing locking up i cnt ride 5 to 15 minutes and it stalls but then it starts right back up it seems to still runs strong its loud so i cant hear it sometime but ithink i hear some knockng help if at all possibl thanks jim