I had the same thing happen to my 2004 fe450.kicked it one day and the kick starter would go down but not engage to turn the engine and would still come back with the spring tension.i removed the clutch cover and clutch to get to the kick start mechanism and the little ratchet tounge was stuck down.i ended up filing a small lead on the edge of it where it was getting caught and filed any burrs of around where it sits in and havnt had an issue since.
BUT before you go taking the cover and clutch and everything off try operating the kickstarter by hand and tap the end of the shaft on the bolt head with a hammer(not to hard as to damage the bolt head) at the same time,as wen i discovered the ratchet was stuck down the slightest bump i gave it was enough to let it spring back up.if i had thought of that before pulling it apart i probably would not of pulled it apart.also if you do pull it apart,remember the timing marks on the primary pinion and idler shaft,the 2 gears to the left of the clutch basket.
Happy travels and hope the easy fix works for you