Hi, yes I have a YSB8. Although it looks like YSB is sideways and the SB is upright. It also looks like SB has a gear driven water pump while mine is belt driven. That aside, mine is set so pulling the throttle back to it's stop, shuts off the engine. There is a compression lever, that I use when hand starting (mine came with a hand crank). Try it once or twice a season just to see if I still have the stuff. There is a place on the decom lever that I could attach a stop cable if I desired but I had read somewhere that YSB's should not be stopped in this way. Have never had issue stopping it this way so never considered putting one in.

I just noticed you have a Mirage 27.If you have a Yanmar SB8, I would like to know if you must go to engine compartment to stop the motor?I grew up in HFx.My father was on these convoys.Ship sunk twice.