no o rings on these 'ol beaut's(except jet) . wd40 it too all over the outside sometimes helps (cable) most times you can feel if its working correctly or watch to see if the outside of cable sort of stretches when using it

. disconnect it as a last resort and try working it by hand at the carb' at least then you will know if the cable's working as it should too . i take it the carb is tight on inlet ?