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Idle won't adjust

3102 Views 4 Replies 3 Participants Last post by  Helmut
I have an 88 fourtrax 300, been fixing last odds and ends on to get to trail riding shape. I will ride for a while with the idle consistent even while not moving, but eventually idle revs higher and won't calm back down to normal idle either in gear or in neutral...I have tried to adjust the idle with the black knob under the seat, as I did on my 90 before, but the adjust knob seems very loose and doesn't seem to be doing any adjusting in either almost seems this possible and how to fix?

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Will I have to take the gas tank off to have room to do this or can I get to it from under the seat in the air-filter box area? Haven't done much to a carb before so might sound like a dumb question.

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