I started with a stock 81 CB650 Custom, carbs were VB44A's, original four into four exhaust. When I could get the idle passages open on these carbs, the bike ran great, reved right up and ran like a raped ape!
Fast forward, I had a head gasket leak (the "O" ring thing) so I pulled the head and cylinders, replaced the gaskets and while i was in there, did a ring job. As I always was fighting with the VB44A carbs, I located a set of VB44B carbs off of a 82 CB650 from a guy in Canada. The advantage to the VB44B's (and VB44C's) is that the idle jets are removable, making it easy to ensure the idle passages are clear.
Anyways, everything is back together and the bike starts right up (before with the VB44A carbs it was hit or miss if the bike started easy first time in the morning) with just a little choke applied. It idles nice and smoothly and revs right up until you attempt to ride it, then it will not go past 5k RPM.
I had set the fuel mixture screws to 2-1/4 turns out then moved them to 2-3/4,m then to 3-1/4 turns out. each adjustment made a little difference but it is still a struggle to get the RPM's over 6k while riding. In the driveway, all is good but actually riding it is no-go. In frustration, I removed the air filter and wow, this bike goes! It is like night and day between having the air filter in-place and having it removed.
I have verified the idle jets are # 35's and the mains are 120's, just like the old VB44A carbs were and the Honda specs. For all I can tell, these new (to me) VB44B carbs are set correctly and should act just the same as the old VB44A's.
The exhaust is in good condition, no leaks and it is not plugged up (it's not a 2 stroke after all).
Any ideas on what and why this condition exists?
I plan on getting a new air filter and fabricating up a ring to hold it in-place instead of using the stock cover and see if that helps.
BTW, Terry, those VB44A carbs should be there by tomorrow.