Getting the wrong parts can be a pain I know, you did the right by testing the plugs nice to know its all working out, thanks for letting us know the update:thumbsup:
Before, I had trouble starting even when warm, I had to hold the glowplug switch down. Now when warm, all I have to do is hit the starter, and it fires right up. That extra speed from the new starter has made it seem like I put a new engine in it. And no smoke when starting. Discovered my steering cylinder is now leaking. Going to get underneath it today and see if it's the cylinder or a hose leaking. Even with all the little things I have had to fix, this is by far the best mower I have ever owned.