Not arguing, just curious....I would think that Larry Brooks is pretty knowledgeable on bike setup, so why do you think they would say it helps with engine braking if it is physically impossible to do so?? Some incentive provided by Rekluse to help them sell more clutches??
Can't speak for him. From my own experience and technical understanding, I can't see why anyone would say such a thing unless it's the magic feather phenomena again.
From my perspective, perhaps it is not so much a pure reduction in engine braking, per se, that it is providing, but instead a much better level of clutch engagement versus my ham handed manual working of a clutch. Maybe I'm not feeling the engine braking as much because the Rekluse is feathering the clutch just enough instead of me doing a poor job of it myself. I don't know...I'm not technically very knowledgeable I just know what I feel by the seat of my pants.
Engine braking occurs when the throttle is released at speeds above idle, right? The Rekluse clutch engages the clutch from a slight drag to a full lock up starting at just over idle (the engagement point you set with the release spring selection) to up at about 3000-3500, at which point it's completely clamped down because of the rotational speed of the clutch, and at which point it will hold the full power of the engine turning against the highest gear it has. Once above that speed, if the clutch won't slip under power, it's certainly not going to slip even slightly when things turn around and the wheel is spinning the engine.
However, if you operate within that narrow range of low engine speeds between the start of engagement and full lock up, the clutch will slip to some degree both on and off throttle, so you may find that when poking around things slowly that the clutch actually will release when you back off, but you'd be moving at less than 10 MPH, so I don't see the "evils of engine braking" working against you there.
I've loved every Rekluse I used, but I'm actually considering not putting on in my 450 because they do tend to neuter the bottom end in my experience. One of the things I like about the 450 is being able to go slower through a corner and still be able to clear the next jump. I'm afraid a Rekluse would dampen that capability as I feel it does have that affect.
Depends on the setup and how you run through the corner. Right off of idle, it will take a little bit of the snappy, jerky, immediate response out, but that should bother trail riders more than MX. I can't see how the clutch would not be fully engaged at the speeds you'd be running in a turn. The bike should respond as it does now.
People use the clutch in corners way too much on big 4 strokes anyway, when they should be using the throttle to control cornering and exits. With all that power, they just don't need the help that peaky pingers do.