how can you tell the difference between an 04 and an 05 motor? does the numbers on the motor mean anything? I think the yfz that my friend bought is an 05 frame with an 04 motor and stuff on it. it has the steel brake pedal and shifter. but I cant figure out the motor. any help would be great thanks.
check on the front right side of the head to see if there is a plug there thats removable or if there is a decompression there if so its a 04 engine if there is nothing there then 05 up engine take a picture of it if you are not sure still and post it up if I get time later I have some 04 heads and 05-06 heads on the shelf in the shop I will take a pic of them and post them up so you can see the difference
steve
also do your friend a favor and talk him into the oil mod but dont drill the cases use the 07 side cover with the 07 nozzle and the 07 oil pump if you want pm me I will give you a parts list of what you will need and its very easy to install.
steve