past 30 years had all kinds of high powered metrics and a few big ci harley motors....my riding is 50 miles a night usually...good for 10.000 miles a year.....questions are....can the 690 stay at highway speeds say at 80 mph for hours and not feel like its being over worked.....how long do the motors last before a rebuild ... will be used for only street riding 1/2 highway 1/2 city....thanks ..Sal