Why is my gas lever sticky on my Honda Odyssey fl250 go-kart?

I have a 1983 Honda Odyssey fl250 go-kart and the gas is VERY sticky. I have tried WD-40, silicone, etc. I don't know if I need a new cable or what. I put a lot of WD-40 on it and when I pressed the gas when it was off it worked fine, I pressed the gas when it was running it worked fine, then I pressed the gas when I was actually driving it and it got VERY sticky again. Again, I don't know if I need a new cable, gas lever, or what. And it's the kind of sticky where I press the gas while moving, and it just stays in that same spot for like 5 seconds. It is very dangerous and I don't want any kids riding it until it gets fixed.

Thanks.

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