The countershaft seal can be pried out easily,just dont do much damage to seal surfaces(on the motor).
as to your jetting problem,put the clip on the main needle back to "stock".
and buy several "main"jets,larger,and,smaller.
"jet-tests"MUST be done after a high-speed test(check sparkplug color,should be "tan")
poping,most all the time (on bikes)is caused by an air-leak somewhere along the exhaust system,
ALSO,when you change:
cams,
airbox,
exhaust's
--it's a GIVEN to re-jet the carb!!
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