Maybe you guys can help.

Short Version: Is there anything I can use to keep my chain/spool from engaging when the shaft spins(not idle) without a transmission?

Long Version: I am not a dirtbiker, but I know that most of you would have a lot of knowledge on this subject. I am a wakeskater(like wakeboarding, not connected) and am building something I want to use to pull me. Basically it has a frame, engine, clutch, chain that goes to the spool, and a couple hundred feet of rope around the spool. Previous winches have worked with a regular go-kart clutch, so when the engine idles the chain doesn't spin the spool. But when first getting up, the engine is at low RPM's, and it takes awhile for the engine to get up to speed and shortens your ride time. I am looking for a way to engage/disengage the spool when I want to, so the engine can be at higher RPM's before I engage it to create a smoother start. Thanks in advance for any replies.

I have been looking into track tunable clutches, I think this is somewhat about what you guys are talking about, and that's probably what I will end up using but wanted to see if there was any alternatives. Do you guys know anything about hydrualic clutches?

Also, most TT clutches I have seen, aren't rated that high on the HP. I am using a 13 hp diesel engine, but maybe the Jr. Drag thing will work. Thanks.