John Deere LT160 Kohler

I have a JD LT160 Kohler 16 hp with 800 hours. it started popping and the exhaust was so hot it burnt the front tire. It has no power. I pulled the head looking for something obvious. The exhaust valve is a sandy brown color and everything else is blackened. Any ideas of what to look for?
 
Late ignition timing, possible partially sheared flywheel key IF ignition timing on this model is based on flywheel position.
 
Check for grass,leaves or mouse nest in flywheel & cooling fins causeing eng to overheat,also check driven loads(mower deck bearings,trans)that may be overloading eng & causeing overheating,other things to check,flywheel key,may be bent/sheared & changeing ign timing,dirt/water in carb bowl & internal passages causeing eng to run too lean or a worn intake valve guide,scored cyl wall/rings & compression low or head gasket may have been leaking causeing low compression,if you can't find anything wrong in carb & looking over eng,install a new head gasket & do a leakdown test on eng,this may showup wear problems you can't see.If you need a service/repair manual for eng goto link below & see if manual avail as a free download.
manual
 
Thanks fellas!!! I sure appreciate the quick help. It was the key, sheared to the point were it didn't completely let go but enough to mess up the timing. Thanks again Jim
 

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