"tune ups" hahaha
oil changes include a filter plus 1800ml of oil, 2 qt of synthetic $18, filter $3
http://www.ltr450hq.com/forums/recalls-how-s-tips-etc/518-procedure-oil-change.html
spark plugs last longer in 4 stokes but a new one about $3
fuel filter, i forgot how much it is.
clean chain and re oil
"shimming" is just checking valve lash, set the motor a TDC on intake stroke and use a feeler gauge to check clearance below cam lobe. since their is no adj stud as with rocker arm set ups, you change a shim under the shim bucket to set your valve lash, to "loose" require a thicker shim.
Intake .004-.008"...i hate std measurements
exh .008-.012"
if you do it all at once, you can do all in an hour