sledcrusher is a pro..sledcrusher said:First things first. You want the sled OFF before you go under.
1. Biggest concern is getting the water out of the engine. Right side up, pull it over a bunch with the plugs out. Now, upside down, or on its side pull it over. Taking the pipe off will make it go faster and let everything work faster. Pull the carbs off and pull it over more. Clean your carbs with gas to ensure all the waters out. Drain your gas and oil tank. Your most likely going to have to replace your headlights. Put a little 2-stroke mineral oil in the cylinders and pull it over some. Carbs back on and a new set of plugs. Pull it till she fires. You want it running as fast as possible to prevent rust buildup on pistons, cylinders, and bearings.
Because water in the engine while its running may hydro lock the engine, which may bend/break rods, and do other damage to engines. If you hydro lock an engine your going to be tearing it down. If the machine is fully submerged, engine running or not your going to get water in from exhaust and intake. If I ever sunk my sled I would pull the engine apart regardless, you may get all the water out of the combustion chamber and it will run but your most likely not going to get it all out of the cross shaft that runs the oil and water pump. Just my .02.shady800x said:why do we have to kill the engine before going under? just curious.