Anyone know what accounts for the extra 220lbs that the 62 weighs? It's listed at 4480, compared to 4260 for the 60. Also, the Specter catalog says that the 2F engine is more powerful than th 3F-E, (165HP vs. 155), but I've read from other sources that the 2F is 135HP. Any other comparisons and pros and cons of either model are also invited here. Thanks.