Well I 'think' I have my answer! LOL I knew all the brain trusts on here would have an answer!
Seriously, the reason I was asking is the following:
1) Long ago I removed the factory exhaust system and replaced it with straight headers.
2) Also, a while ago I installed adjustable rear links to enable slightly lowering the rear suspension. I have a rough Idea how much lower I set it by comparing the length of stock 'dog bone' links to the length of the adjustable links I have now installed. However, to properly set the height of the front suspension (the amount the forks extend above the triple clamp), I'm trying to determine where the factory number of 5.1 inches is measured for the advertised ground clearance. It's probably below the factory headers some where.
Thanks for the help ya all. I guess I'll carry on. LOL
BTW, I'm also assuming the quoted 5.1 inches is with the bike unladen and not with some chubby rider aboard. LOL