Good advice. Small compressors and good tire gauges are inexpensive, and every motorcyclist should have both.
Just one thing - it's time, not mileage. Heat in the tires will affect pressure slightly, but not enough to really make a difference in the air seepage. If you'd done those 400 miles in one day, you'd likely be fine (though it's good practice to check your tire pressure before every ride, as part of the usual pre-ride checks). But if you rode 20 miles home from the dealer and then let the bike sit in the garage for a week, it's likely you'll have lost at least a couple-five pounds in each tire.
Still ... seven pounds in the front? I'd suspect a slow leak unless it had been months since you last checked your tires. Check the tread and sidewall very carefully.
Just one thing - it's time, not mileage. Heat in the tires will affect pressure slightly, but not enough to really make a difference in the air seepage. If you'd done those 400 miles in one day, you'd likely be fine (though it's good practice to check your tire pressure before every ride, as part of the usual pre-ride checks). But if you rode 20 miles home from the dealer and then let the bike sit in the garage for a week, it's likely you'll have lost at least a couple-five pounds in each tire.
Still ... seven pounds in the front? I'd suspect a slow leak unless it had been months since you last checked your tires. Check the tread and sidewall very carefully.