Hit a stump with my Honda harmony II HRR2162sda. I believe the crank is bent. There is an incredible vibration and the throttle will not stay in position. I have seen where I can buy replacement engines on the net. I could replace the key but not hte crank. I am not that mechanical. Is it a fairly easy job to replace an engine? The price difference between new engine and new mower is about 240.

Thanks!