My dad just bought a 2006 trx450er. We changed the engine oil just fine and now we're changing the tranny oil, but we have a problem. we are very new with this engine so we are unsure where the oil drainage bolt is located for the tranny oil. Does anyone know which bolt it is. Get back to me as soon as you can. Thanks.  

hey dude,

i have an 06 crf450r. the engines are pretty similar. the tranny oil drain plug is located on the left side of the engine. meaning that it is located near your gear shifter. where your gear shifter is bolted on, to the left of that there is a 12mm bolt which is the drain for the tranny. also u need to unbolt the tranny oil "check bolt" and this is on the right side. its near the tranny oil cap. ur manual should have more details.