Kicker idler shaft.

Cleaning parts and getting ready to assemble the engine for my 82 500 project. The cases I'm using dont have the "flanged" kicker idler shaft. I have a cracked case that does. Opinions on a need to change it to the flanged style? Removal and install tips? I'm using a 87 clutch, primary gear and kicker gears. Kawasaki KX 500 rod conversion should be done this week, finally.............. Any other 500 engine tips while its still apart?

I have used the updated kicker gears without the flanged shaft but had to shim the idler gear out to keep it from rubbing on the washer behind the clutch on the mainshaft. Took .040 off of the face of it and used another stock washer behind it, kept the original in front behind the snap ring. Makes a better gear mesh that way also.

Thanks in advance, Scott