BTW the bike in question at the top of this thread is NOT an F. It is a 1979 cb750K with F brakes and suspension (can't see the rear if it a drum). They originally came with spokes but someone realized the F brakes are much better and swapped them into the front.
The boattail is a dead giveaway that it is a K, the F has a whale tail (like the spoiler on a 70 camaro or firebird), but the 1979 K was the only DOHC year to come with that funky taillight and boattail.
Great bike, keep it and ride the crap out of it.
try
www.cb1100F.net, just don't tell them it isn't an F cause they get kinda funny sometimes.
BTW, the DOHC motors are great motors and make tons more hp than the SOHCs. The suspension is a nicer ride too. The SOHC is just more durable and a little ligther and more compact. Don't snub the DOHCs as they are great bikes. The only problems with them are top end valve issues (if heavily abused the cam chain would let go) and the starter clutch is noisy. If it has valve noise run the other way, if the starter clutch is overly noisy get the wrenches out and tighten it down.