Honda magna random idle issue?

So I just got a 1999 Honda magna 750. It starts and runs great, but it has this random issue when idling. So while idling it'll idle normal where I've set it, then for about 2 seconds the idle will jump up about 1-2k rpm then it'll go back to idling normal. It does this while in neutral as well as when I pull the clutch and let off the throttle and coast to a stop. What could be the cause of this? Abd what can I do to fix this?

Guessing that you are adjusting carb setting without the help of a vacuum gauge to sync things?!

Suggest you log on to a Honda Magna forum. Your helpful hits here will be limited and not necessary correct.

What Candid Chris said - carb sync