I have been having a problem with it for a while.
It will start and idle but will not rev, it just acts like it has a clogged filter when trying to give it any fuel.
I have rebuilt the carb, adjusted the choke, replaced the air & fuel filters, plug, tried draining the tank and put new gas in. The Haynes manual is something be desired in the area of diagnostics.
If anyone has any suggestions, I would greatly appreciate it.  

I just rebuilt my son's carb on his little suzuki 80 and had the exact same trouble. The problem ended up being the new jets were too small. cleaned out the old ones and it runs great. Hope this helps.  

Any luck fixing it? I've got a 2003 trailblazer.  Same problem - Out of the blue, I tried riding it and it would start and idle fine, but when I got on it, put it in gear, and hit the gas, it bogs down and stalls.  If you've got it running again, what did you do?