is this very 1st generation 5port engine im using?coz i dont know what are the differences between the 1st gen and the other gen thats been released by GO,but i think the carb is the revise one unlike the old one which is hard to adjust the idle stop screw coz its under the carb throat,im just curious about the different gen's of the 5 port

and what are the factory needle settings of this engine?

thanks!