ballast resistors

kursplat said

can also try removing the air cleaner and cover the top of the carb. if it idles better it's getting air somewhere.

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Yep :thumrigh: That's the way to do that check :smile:
And to locate where it is I use WD-40 and spray it around the base plate of the carb and see if it picks up the rpm's :thumrigh: