I'm lost, I don't know what modification you are talking about.
Wet plate motorcycle clutches most certainly do wear when feathered. Many dirtbikers have "upgraded" to Rekluse autoclutches and now the replacement clutch plate business is thriving.
Most all motorcycle starters use a Sprague clutch same as used to disconnect helicopter rotor systems in case of engine or transmission failures. Some motorcycle engines have problems with the starter Sprague clutch when motor oil has high moly content and the engine is warm. Engine starts fine cold but not after a visit to Dairy Queen.
I have no idea about this kind of modification...sorry!
I know motorcycle clutches are "WET" ones and don't wear out like a dry car/trucks does if you feather (ride) them. And I just learned about the slip clutches for motorcycles too.
I also know a little about helicopter sprag clutches - so important that they work properly during an engine failure to keep the rotors (RPM's) going during autorotations (aka helicopter gliding) to the ground.
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