Hey guys, I have been searching through the forums for my problem and have found a few individuals with similar cases. I tried to remedy the problem with some of the recommended fixes but have come up with nothing. The issue is as follows: Bike will start up with choke pulled out and idles quite nicely. If you push the choke in at any time it immediately dies. If you try to apply throttle while pushing in the choke it bogs heavily, sputters, and eventually quits with an occasional backfire as well. I bought the bike from an individual who obviously knew of the problem and just wanted to get rid of it. Originally I believed it to be carb related as well as most would, I believe. I have taken the carburetor off and thoroughly cleaned all passageways with special attention to the pilot jet circuit (from what information I received from other members posts). I have replaced all jets back to new O.E. jets. I replaced my pilot screw with an aftermarket toolless version. Tonight I checked the TPS and CDI Magneto resistances and voltages while running and those checked out within limits. I have inspected the valve clearances and those were all within limits. The right exhaust was right at the lower limit (very tight). While the engine is running at idle with choke on it doesn't make any abnormal sounds (that I am aware of). Does the accelerator pump work while choke is on and off or should I be worried about the diaphragm? I just can't believe it is anything other than the carb because the problem does not exist when choke is on. I am about to drain the brand new oil I put in and start taking this engine apart because I am completely baffled. I hate not knowing what kind of terrible maintenance has been done on this bike and would appreciate any help I can get with this! Thanks much guys!