It is what helps regulate how much air gets to the engine. In the first pic where it is stuck all the way at the top, it let in too much air. It would run a perfect idol, but as soon as you open that metal plate, massive amounts of air would get in the engine. Thus, it dies. If its stuck half way, I would assume it would run a good idol and you would be able to get some good rpms out of it. But open it too much and too much air gets in the engine. Exactly where is the plunger on yours? Is it like the second pic (where it should be) or somewhere in between the first pic and the top?
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-Josh My Ride:
ASW Carbide
Mods:
Dr. Pulley Hit Clutch
FMF Slip-On Exhaust
No Rev. CDI
Uni Air Filter
130 Main jet
1500 RPM main clutch spring
11g sliders
75w Halogen Headlights
CARBIDE!
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