OK
NOW, I get it. I read that several times, but it never sunk in. Sometime it takes a ton of bricks to get thru my thick head.

The one-way bearing/sprag, aka overriding clutch, aka one way clutch, and I think I even seen it called a locking clutch somewhere, IS the engine brake. THAT makes it use the HL clutch system.

I thought the engine brake was just the engine holding back when letting off the gas. Jake Break kinda.

Well as GI Joe said, "Now you know, and knowing is half the battle!" AND NOW I KNOW.

I've said it before and I'll say it again.

THANKS DUDE! I really do appreciate all the help.

Another question just to help me and possibly others.
Does the HL stand for Hydrolic Lubrication?  aka wet clutch?
Does the MC stand for Motor Cycle? Dry clutch?

Wait a minute NOW, NOW I think I get it.

If the clutch is a WET CLUTCH,  then it is the HL.

If the clutch is a DRY CLUTCH,  then it is the MC.

And only the HL clutch has the one-way bearing?? 

Either way I going to get HL clutch parts. Thanks again.

[2015 Z Force 800 53/Trail EPS]

That's how I read it. And I have no idea what HL stands for in this context. MC..yeah, they have them and never have engine braking below clutch engagement.. so I get "Motor Cycle".

"I thought the engine brake was just the engine holding back when letting off the gas. Jake Break kinda."
Actually a Jake brake is kind of different. With no such brake and you are descending a hill (let's say) the piston sucks in a partial charge (the throttle is closed after all) and compresses it, that is doing work.

Then once a piston passes TDC the compressed charge (even not ignited) acts like a spring, helps push the piston back down getting you some free energy back again. The Jake however lets the piston do all the work of compressing the charge and then before the piston starts to go down again and you'd get that spring energy, the Jake up and lifts the exhaust valve and dumps the compressed charge right into the exhaust system! The motor has done all that work and didn't get anything back again, the Jake has chucked all that compressed air energy away. On one, to, or three cylinders the motor becomes a big air compressor.
It's an effective enough brake that on steep hills a loaded logging truck can start to slide the drivers and you know about this because the motor starts to slow down while the truck speeds up! Better get off of 3 cylinder Jake down to 2 or 1, and add some trailer brake.

Maybe you know that, after all.