My brother and I are racing and we both seam to be having the same issue. The motors will idle then rev up. Or after giving throttle it will rev up for a few seconds. Makes it real hard to drive lol. Sealed the garbs and reset all needles with no luck fixing. Please help.

not much info, but may be air leak somewhere. I would clean everything from tank to engine. Then check for leaks. I wouldn't think that both have the same problem but it could though. Next thing would be tuning probs.

Sounds like it is lean on the bottom.Check your low speed needle. Take it all the way in counting how many turns then back it out so you have a reference point then come out 2/3 hours and see if it still doing it

what motor and pipe are you running??

Do you mean that it idles a while, then revs rise all by itself? Enough to make wheels turn when sitting on the starterbox?
How long does it idle normally before revs increase? And do the revs stay up or is it just a momentary rise followed by normal idle again?

If it idles a while then revs up all by itself, and you don't have air leaks, it has to be lean LSN.
How does a pinch test go?