sounds like you have the oil injection blocked of ok ?
is the shrink tube pinched off at the end tightly ?
a small 1/8" vaccuum cap works best, available at any auto parts store.
there is only 3 adjustments on a blaster carb....
float height, which must be correct @ 20-21.5 mm
the airscrew, which should produce high idle between .5 and 2 turns out
the idle screw, on top of tors box, or midway on carb if tors delete was done with a kit.
try turning the idle screw up until it will idle on it's own,
pull and reclean the pilot jet, one very small piece of debri can clog it instantly
and recheck that float height