Are you using the right clearances? Are you turning the motor over counterclockwise? Is the knock your valves or maybe rod bearings? If you want our shop can do them for you.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.