Up here, the only time we change pilot jets would be if your making major jetting change to your main jets, like moving your carbs to a different engine.
The guy I bought the sled from went down a size on both jets because he was told that the factory setup is conservative and that going down a size wouldn't hurt and give a little more performance. I had really cold weather last weekend and ended up switching them both back to stock . My problem was low speed throttle response and takeoff. Just wondering if I can got back down a size on the main jet and leave the pilot at stock.