I have a '99 Kawasaki Prairie 400 4x4 I am having issues with when tryign to throttle the machine up. I rebuilt the carb and replaced all the jets and the diaphram valve. I put everything back together and it would run fine, problem is when i went to reinstall the gas tank back into place it popped the starter plunger out of place as the front of the threds a messed up. I got the plunger reinstalled but now the machine will idle fine without the throttle on but when u try to rev the machine up with choke it backfires and bogs down and dies out. I can rev it up with choke on and it will run fine. This is why it is throwing me off. I have taken the carb apart and recleaned and got the plunger inserted and fixed but still having the same issue. If i push the primer valve on carb when throttling without choke the unit will run fine also. Any info would be greatful as i do small gas engine work and I do not know much of anything about these types of carbs but this is throwing me for a loop.