Now this isn't a GS series bike but its air cooled and carbureted so I'm just curious what causes this. The bike, when the idle is turned at a bout 1,200 will catch at 3 grand and stick if revved to that area or above. The carb boots are fine, done a wet test several times. The plugs read fine and the air filter is clean. Diaphragms are sealed properly and jets are at specification

BTW this is a Yamaha Maxim 700. I'm just wondering if someone could point out something for me to check.

set your idle screw at 1200 when the bike is fully warmed up
the best time to do this is after a long <more than 50 mile> ride on a hot day

You have a lean condition....  Double check everything...vacuum leak.. mixture setting...float levels etc...

It has a factory exhaust on it?

It is factory exhaust. I don't think it's lean though cuz my plugs vary from looking fine to a little black.

Check my reply here: http://www.gstwins.com/forum/viewtopic.php?t=11321

Is the screw over the vacuum balance tube there? Yamaha's Maxims, both the 700 and the 700X (5-valve Genisis motor), have a long tube at the back of the cylinder block, below where the carb boots mount; this is where this tube is. It balances/equalizes the vacuum between all four carbs. When you do a carb synch you have to use this four-section rod to seperate the vacuum between carbs, so you can balance the carbs properly. It's a special tool.