HI guys we are putting together a 600 for my boy and we are pull starting it and it runs but it is getting hot and we do have the fan hooked up Help thanks
You don't need to hotwire the fan. There's a thermo switch atop the engine, behind the cylinder, above the oil filter. That switch turns on a relay that turns on the fan. The fan will come on when needed.
With that said, be sure the radiator isn't mud-clogged. You can pressure wash it from both front and back, using a car wash. Be sure that the spray is not at an angle to the fins. If the fins get folded down or closed, use needle nose pliers to carefully straighten the fins.
To properly clean the radiator, you really should remove the front plastic, so you can get a nylon bristle brush in there to help remove any blockage. Once you can see a shined light through the radiator, then it's clean.
The 1998 600 radiator has a grille overlaying the radiator. The later years don't have this grille. If you're cleaning a '98 radiator, it is helpful to remove this grille before pressure washing.
If the radiator is clean, the head is clean, the oil is at proper level (remove left side plastic to check oil level in view hole window below the oil filter), then that is all you should need to be doing.
Note that there is an air duct that exhausts the clutch cooling air onto the head. This duct should be pointing the clutch exit duct onto the head just to the right of the spark plug. That duct is part of the engine cooling system, so make sure it's in place. It's retained by a hose clamp.
The right half of the oil pump lifts oil into the oil cooler radiator. Gravity dumps the oil back into the crankcase. Therefore, you have oil cooling and air flow around the cylinder/head. Be sure oil level is sufficient to be lifted into the cooler radiator, that air can flow through the oil cooler radiator (under fan control, as called for by the thermo switch), and that air can circulate around the cylinder and head (not mud clogged)
Pull starting a 600? I'd like to see that.